1
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Jiang Z, Sanders CJ, Xin K, Wang F, Sheng N, Xiong Y. Increasing carbon and nutrient burial rates in mangroves coincided with coastal aquaculture development and water eutrophication in NE Hainan, China. MARINE POLLUTION BULLETIN 2024; 199:115934. [PMID: 38118399 DOI: 10.1016/j.marpolbul.2023.115934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 12/12/2023] [Accepted: 12/12/2023] [Indexed: 12/22/2023]
Abstract
Mangroves sequester and store large area-specific quantities of blue carbon (C) and essential nutrients such as nitrogen (N) and phosphorous (P). Quantifying C and nutrient burial rates in mangroves across a centennial time span and relating these rates to mangrove habitat is fundamental for elucidating the role of mangroves in carbon and nutrient budgets and their responses to environmental changes. However, relevant data are very limited in China. In this study, we used the radionuclides (210Pb and 137Cs) to determine chronologies and C, N and P burial rates in two mangrove forests located at different geomorphologic settings in NE Hainan Island, China. We found that the temporal patterns of C, N and P burial rates since 1900 fitted a quadratic function with a notable increase after 1960s in both mangroves, which coincided with the rapid development of coastal aquaculture since 1960s in NE Hainan and the subsequent coastal water eutrophication in this area. Sediment accretion rate (SAR) and mass accumulation rate (MAR) stayed relatively steady in the open-coastal mangroves, while they increased exponentially in the estuarine mangroves since 1900. The estuarine mangroves had significantly higher SAR and C, N and P burial rates than the open-coastal mangroves. C, N and P burial rates averaged at 141.52 g m-2 a-1, 6.27 g m-2 a-1 and 1.14 g m-2 a-1, respectively in the estuarine core, and these rates averaged at 61.71 g m-2 a-1, 3.71 g m-2 a-1 and 0.43 g m-2 a-1, respectively in the open-coastal core. The results suggest that estuarine mangroves may be more capable of surviving accelerating sea level rise under climate change and play a greater role in C accumulation and nutrient filtering under anthropogenic nutrient enrichment than marine-dominated mangroves. Blue C burial may be enhanced by coastal water eutrophication, but such a relationship needs to be tested in further studies.
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Affiliation(s)
- Zhongmao Jiang
- Hainan Dongzhaigang Mangrove Wetland Ecosystem Observation Station, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, PR China
| | - Christian J Sanders
- National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, Coffs Harbour, NSW 2450, Australia
| | - Kun Xin
- Hainan Dongzhaigang Mangrove Wetland Ecosystem Observation Station, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, PR China
| | - Faming Wang
- Xiaoliang Research Station for Tropical Coastal Ecosystems, CAS engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems, South China Botanical Garden, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 510650, PR China
| | - Nong Sheng
- Hainan Dongzhaigang Mangrove Wetland Ecosystem Observation Station, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, PR China
| | - Yanmei Xiong
- Hainan Dongzhaigang Mangrove Wetland Ecosystem Observation Station, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, PR China.
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Neijnens FK, Moreira H, de Jonge MMJ, Linssen BBHP, Huijbregts MAJ, Geerling GW, Schipper AM. Effects of nutrient enrichment on freshwater macrophyte and invertebrate abundance: A meta-analysis. GLOBAL CHANGE BIOLOGY 2024; 30:e17094. [PMID: 38273479 DOI: 10.1111/gcb.17094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 10/27/2023] [Accepted: 11/24/2023] [Indexed: 01/27/2024]
Abstract
External nutrient loading can cause large changes in freshwater ecosystems. Many local field and laboratory experiments have investigated ecological responses to nutrient addition. However, these findings are difficult to generalize, as the responses observed may depend on the local context and the resulting nutrient concentrations in the receiving water bodies. In this research, we combined and analysed data from 131 experimental studies containing 3054 treatment-control abundance ratios to assess the responses of freshwater taxa along a gradient of elevated nutrient concentrations. We carried out a systematic literature search in order to identify studies that report the abundance of invertebrate, macrophyte, and fish taxa in relation to the addition of nitrogen, phosphorus, or both. Next, we established mixed-effect meta-regression models to relate the biotic responses to the concentration gradients of both nutrients. We quantified the responses based on various abundance-based metrics. We found no responses to the mere addition of nutrients, apart from an overall increase of total invertebrate abundance. However, when we considered the gradients of N and P enrichment, we found responses to both nutrients for all abundance metrics. Abundance tended to increase at low levels of N enrichment, yet decreased at the high end of the concentration gradient (1-10 mg/L, depending on the P concentration). Responses to increasing P concentrations were mostly positive. For fish, we found too few data to perform a meaningful analysis. The results of our research highlight the need to consider the level of nutrient enrichment rather than the mere addition of nutrients in order to better understand broad-scale responses of freshwater biota to eutrophication, as a key step to identify effective conservation strategies for freshwater ecosystems.
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Affiliation(s)
- Floris K Neijnens
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
- Deltares, Delft, The Netherlands
| | - Hadassa Moreira
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
| | - Melinda M J de Jonge
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
| | - Bart B H P Linssen
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
| | - Mark A J Huijbregts
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
| | - Gertjan W Geerling
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
- Deltares, Delft, The Netherlands
| | - Aafke M Schipper
- Department of Environmental Science, Radboud Institute for Biological and Environmental Sciences (RIBES), Radboud University, Nijmegen, The Netherlands
- PBL Netherlands Environmental Assessment Agency, The Hague, The Netherlands
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3
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Guimarães BMDM, Neto IEL. Chlorophyll-a prediction in tropical reservoirs as a function of hydroclimatic variability and water quality. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:91028-91045. [PMID: 37468780 DOI: 10.1007/s11356-023-28826-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 07/13/2023] [Indexed: 07/21/2023]
Abstract
The study goal was to determine spatiotemporal variations in chlorophyll-a (Chl-a) concentration using models that combine hydroclimatic and nutrient variables in 150 tropical reservoirs in Brazil. The investigation of seasonal variability indicated that Chl-a varied in response to changes in total nitrogen (TN), total phosphorus (TP), volume (V), and daily precipitation (P). Therefore, an empirical model for Chl-a prediction based on the product of TN, TP, and normalized functions of V and P was proposed, but their individual exponents as well as a general multiplicative factor were adjusted by linear regression for each reservoir. The fitted relationships were capable of representing algal temporal dynamics and blooms, with an average coefficient of determination of R2 = 0.70. The results revealed that nutrients yielded better predictability of Chl-a than hydroclimatic variables. Chl-a blooms presented seasonal and interannual variability, being more frequent in periods of high precipitation and low volume. The equations demonstrate different Chl-a responses to the parameters. In general, Chl-a was positively related to TN and/or TP. However, in some cases (22%), high nutrient concentrations reduced Chl-a, which was attributed to limited phytoplankton growth driven by light deficiency due to increased turbidity. In 49% of the models, precipitation intensified Chl-a levels, which was related to increases in the nutrient concentration from external sources in rural watersheds. Contrastingly, 51% of the reservoirs faced a decrease in Chl-a with precipitation, which can be explained by the opposite effect of dilution of nutrient concentration at the reservoir inlet in urban watersheds. In terms of volume, in 67% of the reservoirs, water level reduction promoted an increase in Chl-a as a response to higher nutrient concentration. In the other cases, Chl-a decreased with lower water levels due to wind-induced destratification of the water column, which potentially decreased the internal nutrient release from bottom sediment. Finally, applying the model to the two largest studied reservoirs showed greater sensitivity of Chl-a to changes in water use classes regarding variations in TN, followed by TP, V, and P.
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Affiliation(s)
| | - Iran Eduardo Lima Neto
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Bl. 713, 60, Fortaleza, 451-970, Brazil.
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Pan Y, García-Girón J, Iversen LL. Global change and plant-ecosystem functioning in freshwaters. TRENDS IN PLANT SCIENCE 2023; 28:646-660. [PMID: 36628654 DOI: 10.1016/j.tplants.2022.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 12/12/2022] [Accepted: 12/15/2022] [Indexed: 05/13/2023]
Abstract
Freshwater ecosystems are of worldwide importance for maintaining biodiversity and sustaining the provision of a myriad of ecosystem services to modern societies. Plants, one of the most important components of these ecosystems, are key to water nutrient removal, carbon storage, and food provision. Understanding how the functional connection between freshwater plants and ecosystems is affected by global change will be key to our ability to predict future changes in freshwater systems. Here, we synthesize global plant responses, adaptations, and feedbacks to present-day and future freshwater environments through trait-based approaches, from single individuals to entire communities. We outline the transdisciplinary knowledge benchmarks needed to further understand freshwater plant biodiversity and the fundamental services they provide.
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Affiliation(s)
- Yingji Pan
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 130102 Changchun, China; Institute of Environmental Sciences (CML), Leiden University, Einsteinweg 2, 2333 CC Leiden, The Netherlands.
| | - Jorge García-Girón
- Geography Research Unit, University of Oulu, PO Box 3000, FI-90014 Oulu, Finland; Department of Biodiversity and Environmental Management, University of León, Campus de Vegazana, 24007 León, Spain
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Cheng Y, Jiao L, Cheng Q, He J, Zhang Y, Ding S. The evolution of a typical plateau lake from macrophyte to algae leads to the imbalance of nutrient retention. WATER RESEARCH 2023; 236:119937. [PMID: 37054612 DOI: 10.1016/j.watres.2023.119937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 03/31/2023] [Accepted: 04/02/2023] [Indexed: 06/19/2023]
Abstract
Long-term anthropogenic nitrogen (N) and phosphorus (P) inputs have led to lake eutrophication and decreased environmental quality. However, the imbalance in nutrient cycling caused by ecosystem transformation during lake eutrophication is still unclear. The N, P, organic matter (OM) and their extractable forms in the sediment core of Dianchi Lake were investigated. Combining ecological data and geochronological techniques, a coupling relationship between the evolution of lake ecosystems and nutrient retention was established. The results show that the evolution of lake ecosystems promotes the accumulation and mobilization of N and P in sediments, leading to an imbalance in nutrient cycling in the lake system. From the "macrophyte-dominated" period to the "algae-dominated" period, the accumulation rates of potential mobile N and P (PMN, PMP) in sediments have significantly increased, and the retention efficiency of total N and P (TN, TP) has decreased. The increased TN/TP ratio (5.38 ± 1.52 ‒ 10.19 ± 2.94) and PMN/PMP ratio (4.34 ± 0.41 ‒ 8.85 ± 4.16), as well as the reduced humic-like/protein-like ratio (H/P, 11.18 ± 4.43 ‒ 5.97 ± 3.67), indicated an imbalance in nutrient retention during sedimentary diagenesis. Our results show that eutrophication has resulted in the potential mobilization of N in sediments exceeding P, providing new insights for further understanding the nutrient cycle in the lake system and strengthening lake management.
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Affiliation(s)
- Yunxuan Cheng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Water Environment Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Lixin Jiao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Water Environment Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Qinglin Cheng
- School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China
| | - Jia He
- Kunming Institute of Eco-Environmental Sciences, Kunming, Yunnan 650032, China
| | - Yue Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Water Environment Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Shuai Ding
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Institute of Water Environment Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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6
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Wu SW, Shi ZY, Huang M, Yang S, Yang WY, Li YJ. Influence of Mycorrhiza on C:N:P Stoichiometry in Senesced Leaves. J Fungi (Basel) 2023; 9:jof9050588. [PMID: 37233299 DOI: 10.3390/jof9050588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 05/27/2023] Open
Abstract
Senesced leaves play a vital role in nutrient cycles in the terrestrial ecosystem. The carbon (C), nitrogen (N) and phosphorus (P) stoichiometries in senesced leaves have been reported, which are influenced by biotic and abiotic factors, such as climate variables and plant functional groups. It is well known that mycorrhizal types are one of the most important functional characteristics of plants that affect leaf C:N:P stoichiometry. While green leaves' traits have been widely reported based on the different mycorrhiza types, the senesced leaves' C:N:P stoichiometries among mycorrhizal types are rarely investigated. Here, the patterns in senesced leaves' C:N:P stoichiometry among plants associated with arbuscular mycorrhizal (AM), ectomycorrhizal (ECM), or AM + ECM fungi were explored. Overall, the senesced leaves' C, with 446.8 mg/g in AM plants, was significantly lower than that in AM + ECM and ECM species, being 493.1 and 501.4 mg/g, respectively, which was mainly caused by boreal biomes. The 8.9 mg/g senesced leaves' N in ECM plants was significantly lower than in AM (10.4 mg/g) or AM + ECM taxa (10.9 mg/g). Meanwhile, the senesced leaves' P presented no difference in plant associations with AM, AM + ECM and ECM. The senesced leaves' C and N presented contrary trends with the changes in mean annual temperature (MAT) and mean annual precipitation (MAP) in ECM or AM + ECM plants. The differences in senesced leaves' C and N may be more easily influenced by the plant mycorrhizal types, but not P and stoichiometric ratios of C, N and P. Our results suggest that senesced leaves' C:N:P stoichiometries depend on mycorrhizal types, which supports the hypothesis that mycorrhizal type is linked to the evolution of carbon-nutrient cycle interactions in the ecosystem.
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Affiliation(s)
- Shan-Wei Wu
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
- Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China
- Henan Engineering Research Center of Human Settlements, Luoyang 471023, China
| | - Zhao-Yong Shi
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
- Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China
- Henan Engineering Research Center of Human Settlements, Luoyang 471023, China
| | - Ming Huang
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
| | - Shuang Yang
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
- Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China
- Henan Engineering Research Center of Human Settlements, Luoyang 471023, China
| | - Wen-Ya Yang
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
- Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China
- Henan Engineering Research Center of Human Settlements, Luoyang 471023, China
| | - You-Jun Li
- College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China
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Chen Y, Chen J, Xia R, Li W, Zhang Y, Zhang K, Tong S, Jia R, Hu Q, Wang L, Zhang X. Phosphorus - The main limiting factor in riverine ecosystems in China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 870:161613. [PMID: 36646215 DOI: 10.1016/j.scitotenv.2023.161613] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/07/2023] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
River receive substantial nutrient inputs, and serve as the main channel for nitrogen and phosphorus to enter the lake, their nutrient control is of great significance to the alleviation of lake eutrophication. While nutrient limitation affects the primary productivity of water ecosystems and the biodiversity of aquatic communities, identifying the limiting factors in riverine ecosystems across China remains elusive. Here, we explore which nutrients have a stronger effect on nutritional balance and aquatic ecosystems in China's rivers based on the total nitrogen (TN) and total phosphorus (TP) observations from 1412 sampling sites in 2018. This study supports the following three main conclusions. Though the percentages of the sites with TN or TP exceeding the limits varied as per different mesotrophic targets, and TP (53.7 %) contributed more to nutrient enrichment than TN (46.3 %). In addition, the spatial distribution characteristics of river nutrients were high in the north (arid zone) and low in the south (humid zone) in China. According to four classification criteria of N:P ratio, 70.8 % of the sampling sites were attributed to phosphorus limiting, much higher than the sites with nitrogen limiting (4.1 %). TN and TP have a synergistic effect on river nutrients, while TP has a stronger regulation framework. Our results reveal that the nutrients in China's rivers are mainly phosphorus limiting, which implies that phosphorus-oriented best management practices are more likely to maintain the nutrient balance of rivers towards healthy aquatic ecosystems. Synopsis: Phosphorus is the key factor that affecting the stability and nutrient balance of riverine ecosystem.
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Affiliation(s)
- Yan Chen
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Jie Chen
- State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Rui Xia
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Estuarine and Coastal Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Wenpan Li
- China National Environmental Monitoring Centre, Beijing 100012, China
| | - Yuan Zhang
- School of Ecology, Environment and Resources, Guangdong University of Technology, Guangdong 510006, China
| | - Kai Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Estuarine and Coastal Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Shanlin Tong
- State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Ruining Jia
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Northwest University, College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China
| | - Qiang Hu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Estuarine and Coastal Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Lu Wang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; College of Water Science, Beijing Normal University, Beijing 100875, China
| | - Xiaojiao Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Estuarine and Coastal Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Ibáñez C, Caiola N, Barquín J, Belmar O, Benito‐Granell X, Casals F, Fennessy S, Hughes J, Palmer M, Peñuelas J, Romero E, Sardans J, Williams M. Ecosystem-level effects of re-oligotrophication and N:P imbalances in rivers and estuaries on a global scale. GLOBAL CHANGE BIOLOGY 2023; 29:1248-1266. [PMID: 36366939 PMCID: PMC10107953 DOI: 10.1111/gcb.16520] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 10/28/2022] [Accepted: 10/29/2022] [Indexed: 05/26/2023]
Abstract
Trends and ecological consequences of phosphorus (P) decline and increasing nitrogen (N) to phosphorus (N:P) ratios in rivers and estuaries are reviewed and discussed. Results suggest that re-oligotrophication is a dominant trend in rivers and estuaries of high-income countries in the last two-three decades, while in low-income countries widespread eutrophication occurs. The decline in P is well documented in hundreds of rivers of United States and the European Union, but the biotic response of rivers and estuaries besides phytoplankton decline such as trends in phytoplankton composition, changes in primary production, ecosystem shifts, cascading effects, changes in ecosystem metabolism, etc., have not been sufficiently monitored and investigated, neither the effects of N:P imbalance. N:P imbalance has significant ecological effects that need to be further investigated. There is a growing number of cases in which phytoplankton biomass have been shown to decrease due to re-oligotrophication, but the potential regime shift from phytoplankton to macrophyte dominance described in shallow lakes has been documented only in a few rivers and estuaries yet. The main reasons why regime shifts are rarely described in rivers and estuaries are, from one hand the scarcity of data on macrophyte cover trends, and from the other hand physical factors such as peak flows or high turbidity that could prevent a general spread of submerged macrophytes as observed in shallow lakes. Moreover, re-oligotrophication effects on rivers may be different compared to lakes (e.g., lower dominance of macrophytes) or estuaries (e.g., limitation of primary production by N instead of P) or may be dependent on river/estuary type. We conclude that river and estuary re-oligotrophication effects are complex, diverse and still little known, and in some cases are equivalent to those described in shallow lakes, but the regime shift is more likely to occur in mid to high-order rivers and shallow estuaries.
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Affiliation(s)
- Carles Ibáñez
- Department of Climate Change, Area of SustainabilityEURECAT, Technological Centre of CataloniaAmpostaSpain
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
| | - Nuno Caiola
- Department of Climate Change, Area of SustainabilityEURECAT, Technological Centre of CataloniaAmpostaSpain
| | - José Barquín
- IHCantabria, Instituto de Hidráulica AmbientalUniversidad de CantabriaSantanderSpain
| | - Oscar Belmar
- IRTA, Program of Marine & Continental WatersLa RàpitaSpain
| | - Xavier Benito‐Granell
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
- IRTA, Program of Marine & Continental WatersLa RàpitaSpain
| | - Frederic Casals
- Department of Animal ScienceUniversity of LleidaLleidaSpain
- Landscape Dynamics and Biodiversity ProgramCTFC—Forest Science and Technology Centre of CataloniaSolsonaSpain
| | - Siobhan Fennessy
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
- Biology DepartmentKenyon CollegeGambierOhioUSA
| | - Jocelyne Hughes
- School of Geography and the EnvironmentUniversity of OxfordOxfordUK
| | - Margaret Palmer
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
| | - Josep Peñuelas
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Estela Romero
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Jordi Sardans
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Michael Williams
- Chesapeake Biological LaboratoryUniversity of Maryland Center for Environmental ScienceSolomonsMarylandUSA
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Zhou Z, Liu Y, Wang S, Xiao J, Cao X, Zhou Y, Song C. Interactions between Phosphorus Enrichment and Nitrification Accelerate Relative Nitrogen Deficiency during Cyanobacterial Blooms in a Large Shallow Eutrophic Lake. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:2992-3001. [PMID: 36753734 DOI: 10.1021/acs.est.2c07599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Regime shifts between nitrogen (N) and phosphorus (P) limitation, which trigger cyanobacterial succession, occur in shallow eutrophic lakes seasonally. However, the underlying mechanism is not yet fully illustrated. We provide a novel insight to address this from interactions between sediment P and nitrification through monthly field investigations including 204 samples and microcosm experiments in Lake Chaohu. Total N to P mass ratios (TN/TP) varied significantly across seasons especially during algal bloom in summer, with the average value being 26.1 in June and descending to 7.8 in September gradually, triggering dominant cyanobacterial succession from Microcystis to Dolichospermum. The regulation effect of sediment N/P on water column TN/TP was stronger in summer than in other seasons. Iron-bound P and alkaline phosphatase activity in sediment, rather than ammonium, contributed to the higher part of nitrification. Furthermore, our microcosm experiments confirmed that soluble active P and enzymatic hydrolysis of organic P, accumulating during algal bloom, fueled nitrifiers and nitrification in sediments. These processes promoted lake N removal and led to relative N deficiency in turn. Our results highlight that N and P cycles do not exist independently but rather interact with each other during lake eutrophication, supporting the dual N and P reduction program to mitigate eutrophication in shallow eutrophic lakes.
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Affiliation(s)
- Zijun Zhou
- Institute of Yellow River Water Resources Protection, Zhengzhou 450004, PR China
| | - Yuqian Liu
- Institute of Yellow River Water Resources Protection, Zhengzhou 450004, PR China
| | - Siyang Wang
- School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430070, PR China
| | - Jian Xiao
- School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, PR China
| | - Xiuyun Cao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Yiyong Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Chunlei Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China
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10
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Beck M, Billoir E, Floury M, Usseglio-Polatera P, Danger M. A 34-year survey under phosphorus decline and warming: Consequences on stoichiometry and functional trait composition of freshwater macroinvertebrate communities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:159786. [PMID: 36377090 DOI: 10.1016/j.scitotenv.2022.159786] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 10/24/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Worldwide, freshwater systems are subjected to increasing temperatures and nutrient changes. Under phosphorus and nitrogen enrichment consumer communities are often thought to shift towards fast-growing and P-rich taxa, supporting the well-known link between growth rate and body stoichiometry. While these traits are also favoured under warming, the temperature effect on stoichiometry is less clear. As recently shown, there is a general link between functional traits and body stoichiometry, which makes the integration of stoichiometric traits a promising tool to help understanding the mechanisms behind taxonomic and functional community responses to nutrient changes and/or warming. Yet, such approaches have been scarcely developed at community level and on a long-term perspective. In this study, we investigated long-term responses in stoichiometry and functional trait composition of macroinvertebrate communities to nutrient changes (decreasing water P; increasing water N:P) and warming over a 34-year period in the Middle Loire River (France), testing the potentially opposing responses to these drivers. Both drivers should cause shifts in species composition, which will alter the overall community stoichiometry and functional composition following assumptions from ecological stoichiometry theory. We found that the macroinvertebrate community shifted towards P-poor taxa, causing significant trends in overall community stoichiometry which indicates long-term changes in the nutrient pool provided by these consumers (i.e. decrease in %N and %P, increase in N:P). Further, while the former high-P conditions favoured traits associated to detritus feeding and fast development (i.e. small maximum body size, short life duration), recent conditions favoured predators and slow-developing taxa. These results suggest nutrients to be a more important driver than temperature over this period. By providing a pivotal link between environmental changes and functional trait composition of communities, approaches based on stoichiometric traits offer sound perspectives to investigate ecological relationships between multiple drivers operating at various scales and ecosystem functioning.
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Affiliation(s)
| | | | - Mathieu Floury
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F- 69622, Villeurbanne, France
| | | | - Michael Danger
- LIEC, Université de Lorraine, France; Institut Universitaire de France, Paris, France
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11
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Li Y, Liu Y, Wang H, Zuo Z, Yan Z, Wang L, Wang D, Liu C, Yu D. In situ remediation mechanism of internal nitrogen and phosphorus regeneration and release in shallow eutrophic lakes by combining multiple remediation techniques. WATER RESEARCH 2023; 229:119394. [PMID: 36446175 DOI: 10.1016/j.watres.2022.119394] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/14/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
Large anthropogenic inputs of N and P alter the nutrient cycle and exacerbate global eutrophication problems in aquatic ecosystems. This study in Lake Datong, China, investigates the remediation mechanism of multiple remediation technique combinations (dredging, adsorbent amendment, and planting aquatic vegetation) on sediment N and P loads based on two high-resolution sampling techniques (HR-Peeper and DGT) and P sequential extraction procedures. The results showed that high temperature and low dissolved oxygen considerably enhanced pore water dissolved reactive P (DRP) and NH4+ concentrations attributable to abundant Fe-P and organic matter content in the sediment. Fe reduction is critical for regulating pore water DRP release and promoting N removal. Overall, for Lake Datong, combining multiple remediation techniques is more effective in controlling sediment P loads (pore water DRP, P fluxes, forms of P, and labile P), from a long-term perspective, than a single remediation. Lanthanum-modified bentonite (LMB) inactivation treatment can transfer mobile P in the surface sediment into more refractory forms over time, thereby reducing the risk of sediment labile P release. However, it is difficult to effectively remediate internal P loads owing to inappropriate dredging depths and low biomass of aquatic vegetation. Future lake restoration practices should optimize the selection of different remediation technique combinations based on internal N and P pollution characteristics, while reducing external wastewater input. These results are important for understanding the remediation mechanisms of internal N and P and provide suggestions for sediment management of shallow eutrophic lakes.
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Affiliation(s)
- Yang Li
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China; School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430072, PR China
| | - Yuan Liu
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
| | - Huiyuan Wang
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
| | - Zhenjun Zuo
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
| | - Zhiwei Yan
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
| | - Ligong Wang
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
| | - Dihua Wang
- School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430072, PR China.
| | - Chunhua Liu
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China.
| | - Dan Yu
- The National Field Station of Freshwater Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, PR China
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12
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An S, Yan Z, Song Y, Fu Q, Ge F, Wu Z, An W, Han W. Decoupling of N and P aggravated upward along food chains in an urban river ecosystem. CHEMOSPHERE 2023; 313:137555. [PMID: 36526137 DOI: 10.1016/j.chemosphere.2022.137555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/01/2022] [Accepted: 12/11/2022] [Indexed: 06/17/2023]
Abstract
Anthropogenic input of nutrient has profoundly influenced water quality and aquatic organisms, however, large and unbalanced nitrogen (N) and phosphorus (P) inputs (decoupling) can lead to a range of ecological health problems such as eutrophication. Whether and how the decoupling varies along the aquatic food chain remains poorly addressed. Here we chose an urban river ecosystem in the cosmopolis region of Beijing, with reclaimed water as the entire replenishment water source over 20 years, to demonstrate the decoupling pattern of N vs P across trophic levels. Results showed that organism C, N and P concentration increased, but N:P ratio decreased upward along the food chains, suggesting that this decoupling of N and P increased as trophic level ascends. Compared with natural freshwater ecosystem, the decoupling of N and P was aggravated in the reclaimed water river. Moreover, the homeostasis of N and P were higher at higher relative to lower trophic levels, and higher in macro-food chain relative to planktonic food chain. This study, for the first time, revealed the increasing decoupling of N vs P upward along the major food chains in an urban aquatic ecosystem, and could improve the understanding of nutrient cycling at the food chain level under human disturbance, and provide useful information for ecological restoration and eutrophication control of urban wetlands replenished with reclaimed water.
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Affiliation(s)
- Shenqun An
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Zhengbing Yan
- State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Ying Song
- Beijing Drainage Group Co., Ltd, Beijing, 100124, China
| | - Qiang Fu
- Beijing Drainage Group Co., Ltd, Beijing, 100124, China
| | - Feiyang Ge
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Zehao Wu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Wei An
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Wenxuan Han
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
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13
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Dai D, Huang G, Lei K, Cai W, Zhao X, Sun Q, Hu J. Improvement in water pollution control alters nutrient stoichiometry of Guanting Reservoir near Beijing, North China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:45924-45935. [PMID: 36715807 DOI: 10.1007/s11356-023-25558-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 01/21/2023] [Indexed: 01/31/2023]
Abstract
Significant improvement in wastewater treatment is the most effective way for eutrophication control, especially in semiarid regions. However, its effect on the nutrient status and stoichiometry of the receiving water body has remained poorly considered and understood at broad temporal scales. Taking Guanting Reservoir (GR) in Hebei-Beijing (P. R. China) as an example, we present a study that links a continuous monitoring dataset for GR with corresponding estimates of human-induced nutrient discharges in its watershed from the year 2006 to 2019. We find that current GR belongs to strict P limitation and the faster decrease of TP than TN concentrations and continuous increase of TN/TP mass ratios in GR are attributed to the water restoration investment-induced declining of nutrient loadings. The improved municipal wastewater treatment capacity is mainly responsible for these significant changes, due to the higher removal efficiency of TP than TN in municipal wastewater. Given the potential ecological impact on aquatic biodiversity as well as ecosystem function of changes in TN/TP ratios and higher retention rate of TP (97.4%) compared with TN (93.1%) in GR, our findings highlight that future strategy for water pollution control should not only concentrate on more nutrient reduction efficiencies but attach importance to their stoichiometric balance to reduce the potential risk of phytoplankton blooms and toxin production during the water quality recovery of lakes or reservoirs.
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Affiliation(s)
- Dan Dai
- Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute ofHydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan, 430079, People's Republic of China.
| | - Guoxian Huang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, People's Republic of China
| | - Kun Lei
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, People's Republic of China
| | - Wenqian Cai
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, People's Republic of China
| | - Xianfu Zhao
- Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute ofHydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan, 430079, People's Republic of China
| | - Qingqing Sun
- School of Earth System Science, Tianjin University, Tianjin, 300072, China
| | - Jun Hu
- Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute ofHydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan, 430079, People's Republic of China
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14
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Fu B, Fang C, Xia J, Pan S, Zhou L, Peng Y, Yan Y, Yang Y, He Y, Chen S, Yang H, Wang J. Urbanization alters soil bacterial communities in southern China coastal cities. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 250:114492. [PMID: 36603487 DOI: 10.1016/j.ecoenv.2022.114492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 12/18/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Urbanization carries essential influences to ecosystem of soil bacteria in coastal cities. Comprehending the patterns and drivers of bacterial diversity are essential to understanding how soil ecosystems respond to environmental change. This study aimed to explore how soil bacterial community (SBC) response to distinct urbanization of coastal cities on composition, assembly process and potential function in Guangdong province, south China. 72 samples from 24 sample sites within 3 cities were included in the study. Soil chemical properties were analyzed, and the bacterial community were investigated by high-throughout sequencing. Proteobacteria and Acidobacteria were the main phyla. Assembly processes remained in stochastic processes and co-occurrence network of SBC kept stable, while urbanization altered SBC by influencing the dominant phyla. The indicators of communities in coastal city soils were the genera gamma_proteobacterium and beta_proteobacterium. Urbanized extent was the non-negligible factor which affected soil bacterial community, despite the total carbon was still the most vital. The impact of urbanization on bacterial communities might follow a non-linear pattern. Faprotax function prediction showed different urbanized coastal city soils share similar metabolic potential. Our study improved our understanding of the response of soil bacterial communities to urbanization in subtropical coastal cities and offered a useful strategy to monitor the ecology risk toward the soil under urbanization.
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Affiliation(s)
- Bing Fu
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China
| | - Chang Fang
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China
| | - Jun Xia
- Institute of Veterinary Medicine, Xinjiang Academy of Animal Sciences (Research Center for Veterinary Clinical Medicine, Xinjiang Academy of Animal Sciences), Key Laboratory of Herbivore Disease Prevention and Control, Ministry of Agriculture and Rural Affairs, Urumqi 830000, China
| | - Sentao Pan
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China
| | - Lei Zhou
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Yisheng Peng
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, China
| | - Yumeng Yan
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Yan Yang
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
| | - Yinglin He
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China
| | - Shijun Chen
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China.
| | - Huirong Yang
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China; Zhongshan Innovation Center of South China Agricultural University, Zhongshan 528400, China.
| | - Jun Wang
- College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China
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15
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Tong Y, Huang Z, Janssen ABG, Wishart M, He W, Wang X, Zhao Y. Influence of social and environmental drivers on nutrient concentrations and ratios in lakes: A comparison between China and Europe. WATER RESEARCH 2022; 227:119347. [PMID: 36399843 DOI: 10.1016/j.watres.2022.119347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 10/24/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Global anthropogenic flows of nitrogen (N) and phosphorus (P) have exceeded planetary boundaries with significant implications for pollution of the freshwater resources in the world. Understanding the global patterns and drivers of N and P concentrations and their ratios in the lakes could help design more effective management and remediation strategies to mitigate the impacts of eutrophication. While a suite of drivers are associated with the sources of nutrients, their transport and internal processes that control concentrations of N and P in the lakes, much less is known about the relative importance of different drivers in explaining spatial variations of lake nutrients and ratios. In this study, we compared N and P concentrations and their ratios in the lakes across China and Europe and examined the differences of dominant environmental and social drivers on lake nutrients. Our comparison showed that total nitrogen (TN) and total phosphorus (TP) concentrations were much higher in the lakes in China compared to those in Europe (i.e., TN: 1.13 mg/L in China vs. 0.64 mg/L in Europe; TP: 35.83 μg/L in China vs. 19.38 μg/L in Europe, the median value). However, lake N/P ratios for both regions were not statistically different. Concentrations of TN and TP showed decoupling in both regions, with the majority of lakes having high N/P mass ratios when evaluated by the commonly accepted threshold of 23 (i.e., 61% in China and 68% in Europe), indicating that phytoplankton are more P limited relative to N. Agricultural activity in the lake catchment is an important predictor for both nutrient concentrations and their ratio in Europe. This reflects successful investments in infrastructure and policy prescriptions in addressing point sources of pollution. In comparison, lake depth and water residence time are important in the decoupling of N and P concentrations in China. The regional difference between the dominant drivers can provide important insights into development of effective water pollution control measures. It is necessary for policy makers and water resource managers to be aware of large-scale imbalance of nutrients in lake due to the potential environmental consequences. A set of spatially flexible policies for water quality controls would be beneficial for sustaining the ecological integrity and future health of lakes.
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Affiliation(s)
- Yindong Tong
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; School of Science, Tibet University, Lhasa 850000, China.
| | - Zhao Huang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Annette B G Janssen
- Water Systems and Global Change Group, Wageningen University & Research, PO Box 47, 6700 AA Wageningen, the Netherlands
| | | | - Wei He
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - Xuejun Wang
- College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
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16
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Zhang L, Liu H, Zhang L, Chen Y, Baskin CC. Effects of increased precipitation on C, N and P stoichiometry at different growth stages of a cold desert annual. Glob Ecol Conserv 2022. [DOI: 10.1016/j.gecco.2022.e02158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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17
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Zhou Q, Zhang Y, Tao J, Ye L, Wang H, Shan K, Jeppesen E, Song L. Water depth and land-use intensity indirectly determine phytoplankton functional diversity and further regulate resource use efficiency at a multi-lake scale. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 834:155303. [PMID: 35447191 DOI: 10.1016/j.scitotenv.2022.155303] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 04/11/2022] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Biodiversity-ecosystem functioning relationships under multiple pressures have recently been the subject of broad studies. For the key primary producer in aquatic ecosystems, phytoplankton, several studies have focused on trait-based functional diversity (FD) and the related functioning (e.g., resource use efficiency, RUE), and their linkages. However, investigations of the effects of environmental factors at different levels (e.g., land use, lake morphometry, climate and nutrients) on FD and RUE are sparse. We developed a data-driven-model framework to simultaneously elucidate the effects of multiple drivers on FD (functional diversity based on dendrograms, FDc and functional richness, FRic) and RUE (of nitrogen and phosphorus) of phytoplankton based on data from 68 Yunnan-Guizhou Plateau lakes, Southwest China. We found that the concentration of total phosphorus, which is mainly affected by land-use intensity and influenced by water depth, was the primary (positive) driver of changes in both FDc and FRic, while RUE was mainly explained by phytoplankton FD (i.e., FRic). These results indicate that water depth and land-use intensity influence indirectly phytoplankton FD and further regulate RUE. Moreover, nonlinear correlations of RUE with FRic were found, which may be caused by interspecific competition and niche differentiation of the phytoplankton community related to nutrient levels. Our finding may help managers to set trade-off targets between FD and RUE in lake ecosystems except for extremely polluted ones, in which the thresholds derived from the Bayesian network, of total phosphorus, total nitrogen and land-use intensity were approximately 0.04 mg/L, 0.50 mg/L and 244 (unitless), respectively. The probability of meeting the RUE objectives was lower in shallow lakes than in deep lakes, but for FRic the opposite was observed.
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Affiliation(s)
- Qichao Zhou
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Research Academy of Eco-environmental Sciences, Kunming 650034, China.
| | - Yun Zhang
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China
| | - Juan Tao
- Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China
| | - Lin Ye
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Haijun Wang
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China
| | - Kun Shan
- Chongqing Key Laboratory of Big Data and Intelligent Computing, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
| | - Erik Jeppesen
- Department of Ecoscience, Aarhus University, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research, Beijing 100049, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey; Institute of Marine Sciences, Middle East Technical University, Mersin, Turkey
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
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18
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Jiang M, Nakano SI. The crucial influence of trophic status on the relative requirement of nitrogen to phosphorus for phytoplankton growth. WATER RESEARCH 2022; 222:118868. [PMID: 35870387 DOI: 10.1016/j.watres.2022.118868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
Clarifying the pattern of relative nitrogen (N)-to-phosphorus (P) requirements for phytoplankton growth is of great significance for eutrophication mitigation and aquatic system management. The relative N-to-P requirement for phytoplankton growth is considered an essential trait determining species dominance within ecosystems and explaining phytoplankton response to nutrient availability. These requirements vary with environmental trophic status, though this variation remains unclear. Here, we evaluated the relative N-to-P requirements under different absolute nutrient levels using previous and current experimental data on eight phytoplankton species (three studied by us and five extrapolated from previous studies). Results showed that relative N-to-P requirements for phytoplankton growth decreased as absolute nutrient levels increased. Thus, N may be crucial for enhancing phytoplankton growth under low nutrient conditions, whereas P may be the primary limiting factor of phytoplankton growth under sufficient nutrient conditions. This result applies to single species as well as species assemblages, which are independent of species shifts occurring along water N:P gradients. The response observed in our large trophic status gradient may help elucidate the relative importance of N and P reductions in mitigating the impact of eutrophication on ecosystems.
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Affiliation(s)
- Mengqi Jiang
- Center for Ecological Research, Kyoto University, Shiga 520-2113, Japan.
| | - Shin-Ichi Nakano
- Center for Ecological Research, Kyoto University, Shiga 520-2113, Japan.
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19
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Ecological River Health Assessment Using Multi-Metric Models in an Asian Temperate Region with Land Use/Land Cover as the Primary Factor Regulating Nutrients, Organic Matter, and Fish Composition. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19159305. [PMID: 35954657 PMCID: PMC9368116 DOI: 10.3390/ijerph19159305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/15/2022] [Accepted: 07/25/2022] [Indexed: 02/04/2023]
Abstract
This study was performed to determine the ecological health of a temperate river over nine years (2011−2019); it also analyzed the trophic structure and linkage of nutrients (nitrogen [N] and phosphorus [P]), sestonic chlorophyll-a (CHL-a), and the top trophic fish in the Asian monsoon region. Water chemistry, trophic indicators, and tolerance guilds were primarily influenced by land use and land cover (LULC); the magnitude of variation was also related to geographic elevation, artificial physical barriers (weirs), and point sources. Levels of nutrients, organic matter, and CHL-a largely influenced by the intensity of the monsoon seasonality for a particular LULC and stream order. Mann−Kendall tests based on a long-term annual dataset showed that annual organic matter and CHL-a increased over time because of longer hydraulic residence time after weir construction. The results of empirical nutrient models suggested that P was the key determinant for algal growth (CHL-a); the strong P-limitation was supported by N:P ratios > 17 in ambient waters. Linear regression models and canonical correspondence analysis (CCA) were used to determine the influences of LULC and water quality on the trophic/tolerance linkages, fish community compositions and structures, and river health. Tolerant species had a positive functional relationship with nutrient enrichment through total phosphorus (TP) (R2 = 0.55, p < 0.05) and total nitrogen (TN) (R2 = 0.57, p < 0.05), organic pollution in terms of biological oxygen demand (BOD) (R2 = 0.41, p < 0.05) and chemical oxygen demand (COD) (R2 = 0.49, p < 0.05), and algal growth (R2 = 0.47, p < 0.05); sensitive species exhibited the opposite pattern. The degradation of river health, based on the multi-metric index of biotic integrity (IBI) model, was evident in the downriver region (“fair−poor” condition) and was supported by the quantitative fish community index (QFCI) model. The outcomes suggested that the degradation and variation of ecological river health, trophic linkages of water chemistry (N, P)-algal biomass-fish, were largely controlled by the land use pattern and construction of physical barriers in relation to the Asian monsoon.
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20
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Sustained stoichiometric imbalance and its ecological consequences in a large oligotrophic lake. Proc Natl Acad Sci U S A 2022; 119:e2202268119. [PMID: 35858403 PMCID: PMC9335326 DOI: 10.1073/pnas.2202268119] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Both nitrogen (N) and phosphorus (P) drive water quality and are heavily altered by human activities that amplify their supplies to lakes, rivers, and oceans. Considerable attention is given to management of absolute nutrient levels but less to their relative abundances, their N:P stoichiometry. This study documents high N:P ratios in low-nutrient Flathead Lake that persist despite considerably lower N:P ratios in river nutrient inputs. The lake’s elevated N:P ratios are associated with phytoplankton P limitation, impaired food quality for zooplankton, and potential production of the greenhouse gas methane by P-limited microbes. These findings highlight the need to consider not only absolute levels of N and P in aquatic ecosystems, but also their stoichiometric balance. Considerable attention is given to absolute nutrient levels in lakes, rivers, and oceans, but less is paid to their relative concentrations, their nitrogen:phosphorus (N:P) stoichiometry, and the consequences of imbalanced stoichiometry. Here, we report 38 y of nutrient dynamics in Flathead Lake, a large oligotrophic lake in Montana, and its inflows. While nutrient levels were low, the lake had sustained high total N: total P ratios (TN:TP: 60 to 90:1 molar) throughout the observation period. N and P loading to the lake as well as loading N:P ratios varied considerably among years but showed no systematic long-term trend. Surprisingly, TN:TP ratios in river inflows were consistently lower than in the lake, suggesting that forms of P in riverine loading are removed preferentially to N. In-lake processes, such as differential sedimentation of P relative to N or accumulation of fixed N in excess of denitrification, likely also operate to maintain the lake’s high TN:TP ratios. Regardless of causes, the lake’s stoichiometric imbalance is manifested in P limitation of phytoplankton growth during early and midsummer, resulting in high C:P and N:P ratios in suspended particulate matter that propagate P limitation to zooplankton. Finally, the lake’s imbalanced N:P stoichiometry appears to raise the potential for aerobic methane production via metabolism of phosphonate compounds by P-limited microbes. These data highlight the importance of not only absolute N and P levels in aquatic ecosystems, but also their stoichiometric balance, and they call attention to potential management implications of high N:P ratios.
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Shen R, Yang H, Rinklebe J, Bolan N, Hu Q, Huang X, Wen X, Zheng B, Shi L. Seasonal flooding wetland expansion would strongly affect soil and sediment organic carbon storage and carbon-nutrient stoichiometry. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 828:154427. [PMID: 35288135 DOI: 10.1016/j.scitotenv.2022.154427] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/04/2022] [Accepted: 03/05/2022] [Indexed: 06/14/2023]
Abstract
In the past few decades, many non-flooding uplands (NF) and permanent flooding waters (PF) have been turned into seasonal flooding wetlands (SF) at the global scale. This trend could severely threaten global climate system by changing carbon cycling in terrestrial and aquatic ecosystems. However, the effects of SF expansion on soil and sediment organic carbon (SOC) storage and carbon-nutrient stoichiometry are far from clearly understood. Therefore, we explored SOC storage and carbon-nutrient stoichiometry among adjacent NF, SF and PF using 817 samples at 0-100 cm depth increment at Poyang Lake and Shengjin Lake in the middle-lower Yangtze River floodplain, China. The SFs of the two lakes were both Carex lakeshore wetlands. The NF of Shengjin Lake was a near-natural forest, while the NF of Poyang Lake was a disturbed grassland. The results showed that SOC storage at SFs of Poyang Lake and Shengjin Lake was 75.61 and 98.01 Mg C/ha at 0-100 cm depth increment. The difference in SOC storage among nearby NF, SF and PF depended on depth and disturbance. SOC storage at SF was equivalent to that at near-natural NF, but was much higher than that at disturbed NF. SOC storage at SF was 12.62%-24.50% higher than that at PF at 0-30 cm depth increment, but was 15.16%-25.87% lower than that at PF at 0-100 cm depth increment. Edaphic carbon and nutrients followed allometric relationships at most sites and C increased faster than N and P along the depth gradients. Carbon-nutrient stoichiometric relationships at SF and PF were similar, and were more coupled than those at near-natural NF. This research illustrates the strong effects of seasonal flooding on SOC sequestration in terrestrial and aquatic ecosystems, and expands our understanding of carbon cycling in these two ecosystems.
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Affiliation(s)
- Ruichang Shen
- Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, Institute of Life Science and School of Life Science, Nanchang University, Nanchang 330031, China; Jiangxi Poyang Lake Wetland Conservation and Restoration National Permanent Scientific Research Base, National Ecosystem Research Station of Jiangxi Poyang Lake Wetland, Nanchang University, Nanchang 330031, China; Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang 330031, China; Jiangxi Institute of Ecological Civilization, School of Resources and Environment, Nanchang University, Nanchang 330031, China.
| | - Hong Yang
- Department of Geography and Environmental Science, University of Reading, Reading RG6 6AB, UK
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water and Waste Management, Laboratory of Soil and Groundwater Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, 98 Gunja-Dong, Guangjin-Gu, Seoul 05006, Republic of Korea
| | - Nanthi Bolan
- School of Agriculture and Environment, The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6001, Australia
| | - Qiwu Hu
- School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China
| | - Xinyun Huang
- Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, Institute of Life Science and School of Life Science, Nanchang University, Nanchang 330031, China
| | - Xiuting Wen
- Jiangxi Institute of Ecological Civilization, School of Resources and Environment, Nanchang University, Nanchang 330031, China
| | - Bofu Zheng
- Jiangxi Institute of Ecological Civilization, School of Resources and Environment, Nanchang University, Nanchang 330031, China
| | - Lei Shi
- Jiangxi Institute of Ecological Civilization, School of Resources and Environment, Nanchang University, Nanchang 330031, China
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Aridity and High Salinity, Rather Than Soil Nutrients, Regulate Nitrogen and Phosphorus Stoichiometry in Desert Plants from the Individual to the Community Level. FORESTS 2022. [DOI: 10.3390/f13060890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The stoichiometric characteristics of plant nitrogen (N) and phosphorus (P) and their correlations with soil properties are regarded as key for exploring plant physiological and ecological processes and predicting ecosystem functions. However, quantitative studies on the relative contributions of water–salt gradients and nutrient gradients to plant stoichiometry are limited. In addition, previous studies have been conducted at the plant species and individual levels, meaning that how community-scale stoichiometry responds to soil properties is still unclear. Therefore, we selected typical sample strips from 13 sampling sites in arid regions to assess the leaf N and P levels of 23 species of desert plants and measure the corresponding soil water content, total salt content, total nitrogen content, and total phosphorus content. The aim was to elucidate the main soil properties that influence the stoichiometric characteristics of desert plants and compare the individual and community responses to those soil properties. Our results indicated that the growth of desert plants is mainly limited by nitrogen, with individual plant leaf nitrogen and phosphorus concentrations ranging from 4.08 to 31.39 mg g−1 and 0.48 to 3.78 mg g−1, respectively. Community stoichiometry was significantly lower than that of individual plants. A significant correlation was observed between the mean N concentration, P concentration, and N:P ratio of plant leaves. At the individual plant scale, aridity significantly reduced leaf N and P concentrations, while high salt content significantly increased leaf N concentrations. At the community scale, aridity had no significant effects on leaf nitrogen or phosphorus stoichiometry, while high salinity significantly increased the leaf N:P ratio and there were no significant interactions between the aridity and salinity conditions. No significant effects of soil nutrient gradients were observed on plant N and P stoichiometric characteristics at the individual or community levels. These results suggest that individual desert plants have lower leaf N and P concentrations to adapt to extreme drought and only adapt to salt stress through higher leaf N concentrations. The N and P stoichiometric characteristics of desert plant communities are not sensitive to variations in aridity and salinity in this extreme habitat. The results of this study could enhance our perceptions of plant adaptation mechanisms to extreme habitats within terrestrial ecosystems.
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Liu J, Feng Y, Zhang Y, Liang N, Wu H, Liu F. Allometric releases of nitrogen and phosphorus from sediments mediated by bacteria determines water eutrophication in coastal river basins of Bohai Bay. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 235:113426. [PMID: 35306214 DOI: 10.1016/j.ecoenv.2022.113426] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 03/02/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
Although the Chinese government has conducted much work in recent years to reduce land-based pollutant discharge, eutrophication continues to occur frequently in many rivers, estuaries, and coastal waters. This may indicate that sediment is a major source rather than a sink for nitrogen (N) and phosphorus (P). To clarify the endogenous mechanisms of eutrophication in coastal river basins, the eutrophication status, physicochemical properties, and bacterial parameters of overlying waters and sediments in the catchment (CA), estuarine (EA), and offshore (OA) areas in the Duliujian River Basin of Bohai Bay were investigated. The results showed that the eutrophication index (EI) of CA, EA, and OA were 62.71, 57.86, and 36.51, respectively. The EI was more sensitive to increases in P (slope = 3.887) than to increases in N (slope = 0.734) of the overlying water, indicating that P is the main factor driving eutrophication in the coastal river basin. However, a nonlinear relationship was found between P in sediments and overlying waters, suggesting that bacterial mediation may occur during P release. As speculated in this study, P in the overlying water increased more quickly than N with increasing bacterial diversity and metabolic abundance, indicating that the allometric release of N and P mediated by bacteria increases the risk of eutrophication. Redundancy analysis showed that organic matter and total N in sediment have positive effects on bacterial communities, which explains 21.8% and 23.7% variation in bacterial diversity, and explains 31.3% and 7.1% variation in bacterial metabolism. This also suggests that the accumulation of N in the sediment promotes the release of P and further aggravates the eutrophication of water. Therefore, simultaneous control of N and P is necessary to control water eutrophication in coastal river basins.
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Affiliation(s)
- Jiayuan Liu
- Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Yue Feng
- Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Yan Zhang
- Tianjin Academy of Eco-Environmental Sciences, Tianjin 300191, China
| | - Nan Liang
- Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Hailong Wu
- Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China.
| | - Fude Liu
- Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China.
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Atalay S, Sargin I, Arslan G. Crystallization of struvite-K from pumpkin wastes. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:523-530. [PMID: 34143501 DOI: 10.1002/jsfa.11380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/31/2021] [Accepted: 06/18/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Use of slow-release fertilizers derived from biological sources is important in sustainable agricultural development. Struvite-K (KMgPO4 ·6H2 O) is magnesium potassium phosphate mineral that has high potential for use as fertilizer in agriculture. Struvite-K is particularly suitable for slow-release fertilizer systems since struvite-K crystals are sparingly soluble in water. Seeds of pumpkin Cucurbita pepo L. are recovered and consumed as food, but the remaining pulp has no economic value. RESULTS The present study evaluated the feasibility of struvite-K crystals recovery from pyrolysis products of pumpkin wastes. In the study C. pepo pulp was decomposed at high temperatures and potassium was extracted from the residue and then crystalized from the solution by addition of NaH2 PO4 ·2H2 O and MgCl2 ·6H2 O salts. Struvite-K was characterized by Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) spectroscopy and X-ray diffraction (XRD) analysis. CONCLUSIONS The study revealed pumpkin wastes can be evaluated as source of potassium and 80% of potassium could be recovered as struvite-K crystals, which have a potential use as a slow-release mineral fertilizer for sustainable agriculture operations. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Sema Atalay
- Department of Chemistry, Faculty of Science, Selçuk University, Konya, Turkey
| | - Idris Sargin
- Department of Biochemistry, Faculty of Science, Selçuk University, Konya, Turkey
| | - Gulsin Arslan
- Department of Biochemistry, Faculty of Science, Selçuk University, Konya, Turkey
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Zhou J, Han X, Brookes JD, Qin B. High probability of nitrogen and phosphorus co-limitation occurring in eutrophic lakes. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 292:118276. [PMID: 34606973 DOI: 10.1016/j.envpol.2021.118276] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 06/13/2023]
Abstract
Limnologists and governments have long had an interest in whether nitrogen (N) and/or phosphorous (P) limit algal productivity in lakes. However, the types and importance of anthropogenic and biogeochemical processes of N and P differ with lake trophic status. Here, a global lake dataset (annual average data from 831 lakes) demonstrates that total nitrogen (TN): total phosphorous (TP) ratios declined significantly as lakes become more eutrophic. From oligotrophic to hypereutrophic lakes, the probability of N and P co-limitation significantly increases from 15.0 to 67.0%, while P-only limitation decreases from 77.0 to 22.3%. Furthermore, TN:TP ratios are mainly affected by concentrations of TP (r = -0.699) rather than TN (r = -0.147). These results reveal that lake eutrophication mainly occurs with increasing P rather than N, which shifts lake ecosystems from stoichiometric P limitation toward a higher probability of N and P co-limitation. This study suggests that low N:P stoichiometry and a high probability of N and P co-limitation tend to occur in eutrophic systems.
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Affiliation(s)
- Jian Zhou
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, PR China
| | - Xiaoxia Han
- Jiangsu Environmental Engineering and Technology Co., Ltd., Jiangsu Environmental Protection Group Co., Ltd., Nanjing, 210036, China
| | - Justin D Brookes
- Water Research Centre, School of Biological Science, The University of Adelaide, South Australia, 5005, Australia
| | - Boqiang Qin
- Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, PR China.
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Ding D, Arif M, Liu M, Li J, Hu X, Geng Q, Yin F, Li C. Plant-soil interactions and C:N:P stoichiometric homeostasis of plant organs in riparian plantation. FRONTIERS IN PLANT SCIENCE 2022; 13:979023. [PMID: 35979078 PMCID: PMC9376457 DOI: 10.3389/fpls.2022.979023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 07/11/2022] [Indexed: 05/06/2023]
Abstract
Carbon (C), nitrogen (N), and phosphorus (P) stoichiometric ratios give valuable insight into ecosystem function. The purpose of the present study is to probe into the C, N, and P stoichiometric characteristics in various organs and their relationships with soil factors of the dominant deciduous conifer plant species (Taxodium ascendens and Taxodium distichum) during afforestation in the riparian zone of Three Gorges Reservoir. The results showed only a small change in the concentration of C in different plant organs and soils. T. ascendens contained mean N and P concentrations of 7.63 and 1.54 g/kg in fine roots, 5.10 and 0.56 g/kg in stems, and 15.48 and 2.30 g/kg in leaves, respectively. Whereas T. distichum had a mean N and P concentration of 7.08 and 1.37 g/kg in fine roots, 4.84 and 0.59 g/kg in stems, and 16.89 and 2.23 g/kg in leaves. The N:P ratios in all organs were below 14, indicating that N may have inhibited tree growth. The fine roots P and N:P of T. distichum were weak plasticity and weak homeostasis, and those of T. ascendens were plasticity and weak plasticity. Their stems and leaves adhere to strict homeostasis. N concentrations were significantly positively related to P concentrations in every tissue (except the stems of T. ascendens), and C concentrations were significantly positively associated with P concentrations in the stems and leaves of T. ascendens and T. distichum (p < 0.05). Likewise, soil P and fine root P were positively associated (p < 0.01). This study contributes to the understanding of deciduous conifer plant stoichiometry. It demonstrates N, P, and N:P stoichiometric homeostasis in T. ascendens and T. distichum, which can withstand flooding and are suitable for vegetation restoration in the hydro-fluctuation zone.
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Affiliation(s)
- Dongdong Ding
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Muhammad Arif
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
- Biological Science Research Center, Academy for Advanced Interdisciplinary Studies, Southwest University, Chongqing, China
| | - Minghui Liu
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Jiajia Li
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Xin Hu
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Qianwen Geng
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Fan Yin
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
| | - Changxiao Li
- Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation, College of Life Sciences, Southwest University, Chongqing, China
- Biological Science Research Center, Academy for Advanced Interdisciplinary Studies, Southwest University, Chongqing, China
- *Correspondence: Changxiao Li,
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Pérez-Santos I, Díaz PA, Silva N, Garreaud R, Montero P, Henríquez-Castillo C, Barrera F, Linford P, Amaya C, Contreras S, Aracena C, Pinilla E, Altamirano R, Vallejos L, Pavez J, Maulen J. Oceanography time series reveals annual asynchrony input between oceanic and estuarine waters in Patagonian fjords. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 798:149241. [PMID: 34333429 DOI: 10.1016/j.scitotenv.2021.149241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/20/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
The postglacial Patagonian fjord system along the west coast of southern South America is one of the largest stretches of the southern hemisphere (SH) fjord belt, influenced by the SH westerly wind belt and continental freshwater input. This study reports a 3-year monthly time series (2017-2020) of physical and biogeochemical parameters obtained from the Reloncaví Marine Observatory (OMARE, Spanish acronym) at the northernmost embayment and fjord system of Patagonia. The main objective of this work was to understand the land-atmosphere-ocean interactions and to identify the mechanisms that modulate the density of phytoplankton. A key finding of this study was the seasonally varying asynchronous input of oceanic and estuarine water. Surface lower salinity and warmer estuarine water arrived in late winter to summer, contributing to water column stability, followed by subsurface higher salinity and less warmer oceanic water during fall-winter. In late winter 2019, an interannual change above the picnocline due to the record-high polarity of the Indian Ocean Dipole inhibited water column stability. The biogeochemical parameters (NO3-, NO2-, PO43-, Si(OH)4, pH, and dissolved oxygen) responded to the surface annual salinity variations, and oceanic water mass contributed greatly to the subsurface inorganic nutrient input. The water column N/P ratio indicated that no eutrophication occurred, even under intense aquaculture activity, likely because of the high ventilation dynamics of the Reloncaví Sound. Finally, a shift in phytoplankton composition, characterized by surface chlorophyll-a maxima in late winter and deepening of spring-summer blooms related to the physicochemical conditions of the water column, was observed. Our results support the ecosystem services provided by local oceanography processes in the north Patagonian fjords. Here, the anthropogenic impact caused by economic activities could be, in part, chemically reduced by the annual ventilation cycle mediated by the exchange of oceanic water masses into Patagonian fjords.
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Affiliation(s)
- Iván Pérez-Santos
- Centro i-mar de la Universidad de los Lagos, Puerto Montt, Chile; Centro de Investigación Oceanográfica COPAS Sur-Austral, Universidad de Concepción, Chile; Centro de Investigaciones en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile.
| | - Patricio A Díaz
- Centro i-mar de la Universidad de los Lagos, Puerto Montt, Chile; CeBiB, Universidad de Los Lagos, Puerto Montt, Chile
| | - Nelson Silva
- Pontificia Universidad Católica de Valparaíso, Chile
| | - René Garreaud
- Centro de Ciencia del Clima y la Resilencia (CR2), Universidad de Chile, Chile
| | - Paulina Montero
- Centro de Investigaciones en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile; Centro de Investigación Oceanográfica COPAS Sur-Austral, Universidad de Concepción, Chile
| | - Carlos Henríquez-Castillo
- Laboratorio de Fisiología y Genética Marina, Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile; Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile
| | - Facundo Barrera
- Centro de Ciencia del Clima y la Resilencia (CR2), Universidad de Chile, Chile; Facultad de Ciencias & Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Pamela Linford
- Programa de Doctorado en Ciencias mención Conservación y Manejo de Recursos Naturales, Centro i-mar, Universidad de Los Lagos, Puerto Montt, Chile
| | | | - Sergio Contreras
- Facultad de Ciencias & Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Claudia Aracena
- Laboratorio Costero de Recursos Acuáticos de Calfuco, Universidad Austral de Chile, Valdivia, Chile; Centro de Investigación en Recursos Naturales y Sustentabilidad, Universidad Bernardo O'Higgins, Avenida Viel 1497, Santiago, Chile
| | - Elías Pinilla
- Instituto de Fomento Pesquero (IFOP), CTPA-Putemún, Castro, Chile
| | - Robinson Altamirano
- Centro i-mar de la Universidad de los Lagos, Puerto Montt, Chile; CeBiB, Universidad de Los Lagos, Puerto Montt, Chile
| | - Luis Vallejos
- Centro i-mar de la Universidad de los Lagos, Puerto Montt, Chile; CeBiB, Universidad de Los Lagos, Puerto Montt, Chile
| | - Javiera Pavez
- Centro de Investigaciones en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
| | - Juan Maulen
- Centro i-mar de la Universidad de los Lagos, Puerto Montt, Chile
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Modelling the effects of urbanization on nutrients pollution for prospective management of a tropical watershed: A case study of Skudai River watershed. Ecol Modell 2021. [DOI: 10.1016/j.ecolmodel.2021.109721] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Khan ST, Edward Beighley R, VanHoven D, Watkins K. Dynamic stormwater management to mitigate phosphorous export. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 787:147506. [PMID: 33991911 DOI: 10.1016/j.scitotenv.2021.147506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 04/27/2021] [Accepted: 04/29/2021] [Indexed: 06/12/2023]
Abstract
Altered stormwater flow characteristics and associated changes in nutrient and sediment fluxes due to urbanization threaten the water quality of many water bodies. For example, particle-bound phosphorus in stormwater runoff adds to the nutrient pool that can produce harmful algal blooms, and the associated particulate material can endanger fish and other living organisms in surface waters by increasing turbidity. While many studies have investigated how Total Solids (TS) particle size distributions vary in urban stormwater and the associated design criteria for Best Management Practices (BMPs) to remove TS, few studies have included different forms of phosphorus and their association with particle sizes to characterize design criteria to specifically maximize Total Phosphorus (TP) removal. This highlights a gap in our understanding of how the particle size distributions of TP and TS are related, and how these particle size distributions vary within and between storm events. Bridging this knowledge gap can improve design methods for BMPs specifically targeting phosphorus removal. This study characterizes within event (i.e., hourly) TP and TS particle size distributions and associated fluxes from urban catchments in the City of Cambridge, Massachusetts, to characterize potential TP and TS removal based on four different diversion and treatment strategies. The stormwater diversion strategies integrate new insights on temporal variations in particle size distributions and mass loading characteristics. In terms of diverted stormwater, the volume of stormwater treated tends to control more than what water is treated (e.g., first flush, event high flows, or smaller event flows). Based on the event data obtained in this study, considering flow volume different diversion approaches are optimal for TP vs TS, but treatment combined with particles sizes < 100 μm is best for both TP and TS.
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Affiliation(s)
- Sadia Tamanna Khan
- Civil and Environmental Engineering, Northeastern University, 360 Huntington Ave, Boston, MA 02115, United States of America.
| | - R Edward Beighley
- Civil and Environmental Engineering, Northeastern University, United States of America; Marine and Environmental Sciences and Global Resilience Institute, Northeastern University, United States of America
| | - David VanHoven
- Stantec, 226 Causeway St, Boston, MA 02114, United States of America
| | - Kathy Watkins
- City of Cambridge, Department of Public Works, 147 Hampshire St, Cambridge, MA 02139, United States of America
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Webster BC, Waters MN, Golladay SW. Alterations to sediment nutrient deposition and transport along a six reservoir sequence. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 785:147246. [PMID: 33940419 DOI: 10.1016/j.scitotenv.2021.147246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/31/2021] [Accepted: 04/15/2021] [Indexed: 06/12/2023]
Abstract
Reservoir presence and construction has become commonplace along rivers due to the multitude of ecosystem services they provide. Many services are well recognized, including the effectiveness of sequestering both sediments and sediment-bound nutrients such as silts and phosphorus (P). Reservoirs are also capable of transforming or sequestering significant quantities of nutrients with more complex biogeochemical pathways, like nitrogen (N). Reservoir assessments, independent of inflow-outflow models, have primarily focused on a small number of systems creating a growing need to understand how reservoirs function both individually and as reservoir sequences within large rivers and their watersheds. Models have simulated the overall efficiency and drivers of reservoir nutrient deposition, but few have considered how a sequence of reservoirs alters deposition as an interdependent watershed-sediment-transport-system. In this study, we collected sediment cores from a six-reservoir sequence along a 5th - 6th order stream receiving treated waters from a large metropolitan area in the subtropical southeastern United States. Paleolimnological studies of subtropical reservoirs are underrepresented and are needed to understand the history of reservoir development. Using paleolimnological techniques and a known 30 year flux of riverine nutrient loading from waste water treatment facilities, we compared nutrient deposition to reservoir morphological qualities and primary producer community structure during the past ~50 years. Our findings suggest phosphorus deposition is associated with reservoir order downstream of the primary nutrient source, nitrogen deposition is linked to reservoir water retention time, and N:P is most strongly linked to reservoir surface area and watershed population density. Our results were strongly influenced by a large upstream and metropolitan nutrient source, common in large rivers, but under different conditions of nutrient loading (i.e. nonpoint source), reservoirs may express other nutrient depositional patterns.
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Affiliation(s)
- B C Webster
- Department of Crop, Soils and Environmental Science, Auburn University, United States of America.
| | - M N Waters
- Department of Crop, Soils and Environmental Science, Auburn University, United States of America
| | - S W Golladay
- Jones Center at Ichauway, United States of America
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Jones EF, Frei RJ, Lee RM, Maxwell JD, Shoemaker R, Follett AP, Lawson GM, Malmfeldt M, Watts R, Aanderud ZT, Allred C, Asay AT, Buhman M, Burbidge H, Call A, Crandall T, Errigo I, Griffin NA, Hansen NC, Howe JC, Meadows EL, Kujanpaa E, Lange L, Nelson ML, Norris AJ, Ostlund E, Suiter NJ, Tanner K, Tolworthy J, Vargas MC, Abbott BW. Citizen science reveals unexpected solute patterns in semiarid river networks. PLoS One 2021; 16:e0255411. [PMID: 34411107 PMCID: PMC8376020 DOI: 10.1371/journal.pone.0255411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 07/15/2021] [Indexed: 11/18/2022] Open
Abstract
Human modification of water and nutrient flows has resulted in widespread degradation of aquatic ecosystems. The resulting global water crisis causes millions of deaths and trillions of USD in economic damages annually. Semiarid regions have been disproportionately affected because of high relative water demand and pollution. Many proven water management strategies are not fully implemented, partially because of a lack of public engagement with freshwater ecosystems. In this context, we organized a large citizen science initiative to quantify nutrient status and cultivate connection in the semiarid watershed of Utah Lake (USA). Working with community members, we collected samples from ~200 locations throughout the 7,640 km2 watershed on a single day in the spring, summer, and fall of 2018. We calculated ecohydrological metrics for nutrients, major ions, and carbon. For most solutes, concentration and leverage (influence on flux) were highest in lowland reaches draining directly to the lake, coincident with urban and agricultural sources. Solute sources were relatively persistent through time for most parameters despite substantial hydrological variation. Carbon, nitrogen, and phosphorus species showed critical source area behavior, with 10-17% of the sites accounting for most of the flux. Unlike temperate watersheds, where spatial variability often decreases with watershed size, longitudinal variability showed an hourglass shape: high variability among headwaters, low variability in mid-order reaches, and high variability in tailwaters. This unexpected pattern was attributable to the distribution of human activity and hydrological complexity associated with return flows, losing river reaches, and diversions in the tailwaters. We conclude that participatory science has great potential to reveal ecohydrological patterns and rehabilitate individual and community relationships with local ecosystems. In this way, such projects represent an opportunity to both understand and improve water quality in diverse socioecological contexts.
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Affiliation(s)
- Erin Fleming Jones
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Rebecca J. Frei
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Raymond M. Lee
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Jordan D. Maxwell
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Rhetta Shoemaker
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Andrew P. Follett
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Gabriella M. Lawson
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Madeleine Malmfeldt
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Rachel Watts
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Zachary T. Aanderud
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Carter Allred
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Allison Tuttle Asay
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Madeline Buhman
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Hunter Burbidge
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Amber Call
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Trevor Crandall
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Isabella Errigo
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Natasha A. Griffin
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Neil C. Hansen
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Jansen C. Howe
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Emily L. Meadows
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Elizabeth Kujanpaa
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Leslie Lange
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Monterey L. Nelson
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Adam J. Norris
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Elysse Ostlund
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Nicholas J. Suiter
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Kaylee Tanner
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Joseph Tolworthy
- Department of Geology, Brigham Young University, Provo, Utah, United States of America
| | - Maria Camila Vargas
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Benjamin W. Abbott
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, United States of America
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Yan X, Thieu V, Garnier J. Long-term assessment of nutrient budgets for the four reservoirs of the Seine Basin (France). THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 778:146412. [PMID: 34030354 DOI: 10.1016/j.scitotenv.2021.146412] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 02/24/2021] [Accepted: 03/06/2021] [Indexed: 06/12/2023]
Abstract
Artificial reservoirs represent one of the most significant human disturbances of water flows and associated water quality, including nutrients and SM (suspended matter). However, most of the previous studies were only focused on few years or even single year, and the long-term dynamics of nutrient retention in reservoir are under explored. In this study, we present the long-term (1998-2018) hydrological characteristics and water quality in four reservoirs (Marne, Aube, Seine, and Pannecière reservoirs) and their related rivers (Marne, Aube, Seine, and Yonne rivers) of the Seine Basin, France. Based on the hydrology and water quality data, the long-term budgets of nutrients and SM were evaluated in these reservoirs according to mass balance calculation. The results indicated that the four reservoirs play important roles in the retention/elimination of nutrients and SM, and the retention/elimination rates may be affected by hydrophysical and biogeochemical processes. The mean annual retention rates accounted for 16-53% of the inputs of DIN (dissolved inorganic nitrogen), 26-48% of PO43--P (orthophosphates), 22-40% of Si (dissolved silicon), and 36-76% of SM in the four reservoirs during the 1998-2018 period. Further analysis suggested that the annual residence time and the percentage of water released from reservoirs during the filling period significantly correlated with DIN retention rates in the four reservoirs (p < 0.01), which highlights the importance of reservoir water management strategies for the DIN concentrations in the downstream rivers. Interestingly, the Wilcoxon test results also revealed that the three diverted reservoirs (Marne, Aube, and Seine reservoirs) indeed lowered the nutrient concentrations in their downstream rivers during the emptying period, thereby modifying the biogeochemical functioning in the downstream river networks. Finally, these results emphasized the importance of hydrological characteristics in better understanding nutrient retention in reservoirs.
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Affiliation(s)
- Xingcheng Yan
- Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, 4 place Jussieu, Box 105, 75005 Paris, France.
| | - Vincent Thieu
- Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, 4 place Jussieu, Box 105, 75005 Paris, France
| | - Josette Garnier
- Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, 4 place Jussieu, Box 105, 75005 Paris, France
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Beck M, Mondy CP, Danger M, Billoir E, Usseglio‐Polatera P. Extending the growth rate hypothesis to species development: Can stoichiometric traits help to explain the composition of macroinvertebrate communities? OIKOS 2021. [DOI: 10.1111/oik.08090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Miriam Beck
- Univ. de Lorraine, CNRS, LIEC Metz France
- LTER‐‘Zone Atelier Moselle' Metz France
| | - Cédric P. Mondy
- Office Français de la Biodiversité, Direction Régionale d'Ile‐de‐France Vincennes France
| | - Michael Danger
- Univ. de Lorraine, CNRS, LIEC Metz France
- LTER‐‘Zone Atelier Moselle' Metz France
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Sabo RD, Clark CM, Gibbs DA, Metson GS, Todd MJ, LeDuc SD, Greiner D, Fry MM, Polinsky R, Yang Q, Tian H, Compton JE. Phosphorus Inventory for the Conterminous United States (2002-2012). JOURNAL OF GEOPHYSICAL RESEARCH. BIOGEOSCIENCES 2021; 126:1-21. [PMID: 37089664 PMCID: PMC10116864 DOI: 10.1029/2020jg005684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Published reports suggest efforts designed to prevent the occurrence of harmful algal blooms and hypoxia by reducing non-point and point source phosphorus (P) pollution are not delivering water quality improvements in many areas. Part of the uncertainty in evaluating watershed responses to management practices is the lack of standardized estimates of phosphorus inputs and outputs. To assess P trends across the conterminous United States, we compiled an inventory using publicly available datasets of agricultural P fluxes, atmospheric P deposition, human P demand and waste, and point source discharges for 2002, 2007, and 2012 at the scale of the 8-digit Hydrologic Unit Code subbasin (~1,800 km2). Estimates of agricultural legacy P surplus accumulated from 1945 to 2001 were also developed. Fertilizer and manure inputs were found to exceed crop removal rates by up to 50% in many agricultural regions. This excess in inputs has led to the continued accumulation of legacy P in agricultural lands. Atmospheric P deposition increased throughout the Rockies, potentially contributing to reported increases in surface water P concentrations in undisturbed watersheds. In some urban areas, P fluxes associated with human waste and non-farm fertilizer use has declined despite population growth, likely due, in part, to various sales bans on P-containing detergents and fertilizers. Although regions and individual subbasins have different contemporary and legacy P sources, a standardized method of accounting for large and small fluxes and ready to use inventory numbers provide essential infromation to coordinate targeted interventions to reduce P concentrations in the nation's waters.
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Affiliation(s)
- Robert D Sabo
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Office of Research and Development, U.S. EPA, Washington, DC, USA
| | - Christopher M Clark
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Office of Research and Development, U.S. EPA, Washington, DC, USA
| | | | - Geneviève S Metson
- Department of Physics, Chemistry, and Biology, Linköping University, Linköping, Sweden
| | - M Jason Todd
- U.S. Environmental Protection Agency, Office of Chemical Safety and Pollution, U.S. EPA, Washington, DC, USA
| | - Stephen D LeDuc
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Office of Research and Development, U.S. EPA, Research Triangle Park, NC, USA
| | - Diana Greiner
- U.S. Environmental Protection Agency, U.S. EPA, Dallas, TX, USA
| | - Meridith M Fry
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Office of Research and Development, U.S. EPA, Washington, DC, USA
| | - Robyn Polinsky
- U.S. Environmental Protection Agency, U.S. EPA, Atlanta, GA, USA
| | - Qichun Yang
- Pacific Northwest National Lab, Richland, WA, USA
| | - Hanqin Tian
- International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, USA
| | - Jana E Compton
- Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Office of Research and Development, U.S. EPA, Corvallis, OR, USA
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35
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Liang Z, Soranno PA, Wagner T. The role of phosphorus and nitrogen on chlorophyll a: Evidence from hundreds of lakes. WATER RESEARCH 2020; 185:116236. [PMID: 32739700 DOI: 10.1016/j.watres.2020.116236] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 07/24/2020] [Accepted: 07/25/2020] [Indexed: 06/11/2023]
Abstract
The effect of nutrients on phytoplankton biomass in lakes continues to be a subject of debate by aquatic scientists. However, determining whether or not chlorophyll a (CHL) is limited by phosphorus (P) and/or nitrogen (N) is rarely considered using a probabilistic method in studies of hundreds of lakes across broad spatial extents. Several studies have applied a unified CHL-nutrient relationship to determine nutrient limitation, but pose a risk of ecological fallacy because they neglect spatial heterogeneity in ecological contexts. To examine whether or not CHL is limited by P, N, or both nutrients in hundreds of lakes and across diverse ecological settings, a probabilistic machine learning method, Bayesian Network, was applied. Spatial heterogeneity in ecological context was accommodated by the probabilistic nature of the results. We analyzed data from 1382 lakes in 17 US states to evaluate the cause-effect relationships between CHL and nutrients. Observations of CHL, total phosphorus (TP), and total nitrogen (TN) were discretized into three trophic states (oligo-mesotrophic, eutrophic, and hypereutrophic) to train the model. We found that although both nutrients were related to CHL trophic state, TP was more related to CHL than TN, especially under oligo-mesotrophic and eutrophic CHL conditions. However, when the CHL trophic state was hypereutrophic, both TP and TN were important. These results provide additional evidence that P-limitation is more likely under oligo-mesotrophic or eutrophic CHL conditions and that co-limitation of P and N occurs under hypereutrophic CHL conditions. We also found a decreasing pattern of the TN/TP ratio with increasing CHL concentrations, which might be a key driver for the role change of nutrients. Previous work performed at smaller scales support our findings, indicating potential for extension of our findings to other regions. Our findings enhance the understanding of nutrient limitation at macroscales and revealed that the current debate on the limiting nutrient might be caused by failure to consider CHL trophic state. Our findings also provide prior information for the site-specific eutrophication management of unsampled or data-limited lakes.
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Affiliation(s)
- Zhongyao Liang
- Pennsylvania Cooperative Fish and Wildlife Research Unit, Pennsylvania State University, 407 Forest Resources Building, University Park, Pennsylvania 16802, USA.
| | - Patricia A Soranno
- Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Road, East Lansing, Michigan 48824, USA.
| | - Tyler Wagner
- U.S. Geological Survey, Pennsylvania Cooperative Fish and Wildlife Research Unit, Pennsylvania State University, 402 Forest Resources Building, University Park, Pennsylvania 16802, USA.
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Abundance-weighted plant functional trait variation differs between terrestrial and wetland habitats along wide climatic gradients. SCIENCE CHINA-LIFE SCIENCES 2020; 64:593-605. [PMID: 32975721 DOI: 10.1007/s11427-020-1766-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 07/12/2020] [Indexed: 10/23/2022]
Abstract
Patterns of plant trait variation across spatial scales are important for understanding ecosystem functioning and services. However, habitat-related drivers of these patterns are poorly understood. In a conceptual model, we ask whether and how the patterns of within- and among-site plant trait variation are driven by habitat type (terrestrial vs. wetland) across large climatic gradients. We tested these through spatial-hierarchical-sampling of leaves in herbaceous-dominated terrestrial and wetland communities within each of 26 sites across China. For all 13 plant traits, within-site variation was larger than among-site variation in both terrestrial and wetland habitats. Within-site variation was similar in most leaf traits related to carbon and nutrient economics but larger in specific leaf area and size-related traits (plant height, leaf area and thickness) in wetland compared to terrestrial habitats. Among-site variation was larger in terrestrial than wetland habitats for 10 leaf traits but smaller for plant height, leaf area and leaf nitrogen. Our results indicate the important role of local ecological processes in driving plant trait variation among coexisting species and the dependence of functional variation across habitats on traits considered. These findings will help to understand and predict the effects of climatic or land-use changes on ecosystem functioning and services.
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Deng H, Tao Z, Gao Q, Yao L, Feng Y, Li Y, Ding J, Wang Z, Lyu X, Xu P. Variation of biogeochemical cycle of riverine dissolved inorganic carbon and silicon with the cascade damming. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:28840-28852. [PMID: 32418099 DOI: 10.1007/s11356-020-09174-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 05/04/2020] [Indexed: 06/11/2023]
Abstract
To investigate the variation of the biogeochemical cycle of riverine dissolved inorganic carbon (DIC) and silicon (DSi) with the cascade damming, the bicarbonate ([Formula: see text]), dissolved silicon (DSi), and other environmental factors within the cascade reservoirs of the lower reaches of Yalongjiang River, passing through the southeastern Qinghai-Tibet Plateau, were systematically analyzed by collecting water samples during the wet season and dry season from 2018 to 2019, respectively. The results showed that the lower ratio of DSi to[Formula: see text] (0.044 ± 0.001) was mainly controlled by the domination of carbonate mineral in the sedimentary rock of the Yalongjiang River drainage basin. The DSi:[Formula: see text] ratio was positively correlated with discharge (P < 0.05), and negatively correlated with the water retention time (P < 0.01) and chlorophyll a, implying that the variations of DSi:[Formula: see text] ratio were mainly determined by the rock chemical weathering processes and the hydrologic process outside the reservoirs and the biological processes within the cascade reservoirs. The phytoplankton photosynthetic process stoichiometrically assimilated DSi and [Formula: see text], resulted in 3.46 × 104 t·Si a-1 and 1.89 × 104 t·C a-1 sequestering in the cascade reservoirs, respectively. Compared with the situation of dam-free in the lower reaches of Yalongjiang River, the export flux of [Formula: see text] and DSi at the mouth of Yalongjiang River was reduced by 11.87% and 62.50%, respectively; the ratio of DSi:[Formula: see text] decreased by 36.01% for only building the Ertan dam and 53.15% for the cascade damming, respectively. The water renewal time prolonged from 45 to 126.6 days due to the regulation of the cascade reservoirs in the mainstream. Ultimately, a conceptual model on migration-transformation of DIC and DSi within the cascade reservoirs in the lower reaches of Yalongjiang River was established. These findings demonstrated that riverine cascade damming could extend the biogeochemical coupling cycle of DIC and DSi within the inland aquatic ecosystems and ensure the ecological environment security in the hot-dry valley.
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Affiliation(s)
- Haojun Deng
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Zhen Tao
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Quanzhou Gao
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
- Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai, 519080, China
- Key Laboratory of Mineral Resource & Geological Processes of Guangdong Province, Guangzhou, 510275, China
| | - Ling Yao
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Yong Feng
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Yinhua Li
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Jian Ding
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Zhengang Wang
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Xiaoxi Lyu
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
| | - Peng Xu
- School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geosimulation, Sun Yat-sen University, Guangzhou, 510275, China
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Mendivil-Garcia K, Amabilis-Sosa LE, Rodríguez-Mata AE, Rangel-Peraza JG, Gonzalez-Huitron V, Cedillo-Herrera CIG. Assessment of intensive agriculture on water quality in the Culiacan River basin, Sinaloa, Mexico. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:28636-28648. [PMID: 32307681 DOI: 10.1007/s11356-020-08653-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
The percentage of agricultural land cover effect on water quality in Culiacan River basin is studied in this research. The basin contains only intensive cropland as primary economic activity with 60% of the total area. Mathematical relationships between percentages of cropland and total phosphorus (TP) and total nitrogen (TN) concentrations were established. Sampling sites in middle and lower basin and water quality information during 2013-2018 were considered, and percentages of cropland were obtained by geospatial methods including variable area buffers. During rainy season, coefficients of determination were less than 0.2, although quantified nutrient concentration was higher, related to point sources of pollution in the basin. During dry season, coefficients of determination were higher than 0.76 and 0.90 for TN and TP, respectively, with an exponential mathematical trend. Results suggest that intensive agriculture practices generate accelerated loss of soil consolidation, which is transported to water bodies. These soils are in continuous contact with fertilizers and pesticides, mostly organophosphates which have been transported by runoff and underground flows. Using the information generated will help to establish environmental management plans, and to improve environmental diagnosis and effect in countries where there is not enough historical cartographic information and/or water quality data.
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Affiliation(s)
- Kimberly Mendivil-Garcia
- Tecnológico Nacional de México/I.T. Culiacán, División de estudios de Posgrado e Investigación, Av. Juan de Dios Batiz, No. 310, Culiacán, México
| | | | | | - Jesús Gabriel Rangel-Peraza
- Tecnológico Nacional de México/I.T. Culiacán, División de estudios de Posgrado e Investigación, Av. Juan de Dios Batiz, No. 310, Culiacán, México
| | - Victor Gonzalez-Huitron
- CONACYT- Tecnológico Nacional de México/I.T. Culiacán, Av. Juan de Dios Batiz, No. 310, Culiacán, México
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Fregoso-López MG, Armienta-Hernández MA, Alarcón-Silvas SG, Ramírez-Rochín J, Fierro-Sañudo JF, Páez-Osuna F. Assessment of nutrient contamination in the waters of the El Fuerte River, southern Gulf of California, Mexico. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:417. [PMID: 32506388 DOI: 10.1007/s10661-020-08354-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 05/10/2020] [Indexed: 06/11/2023]
Abstract
This study assessed the spatial and temporal nutrient variability in the El Fuerte River basin in northwestern Mexico, considering its effects on the water trophic status as well as the nutrient loading to the Gulf of California. Physicochemical parameters, inorganic species of nitrogen, phosphate, total nitrogen, total phosphorus, and chlorophyll-a (chl-a) were quantified at 16 selected sites along the river in April (dry season) and October (rainy season) 2017. Mean concentrations of nutrients during dry and rainy seasons were 36.3 ± 24.1 and 55.1 ± 74.6 μg L-1 of total ammonia nitrogen, 3.4 ± 3.6 and 4.5 ± 3.5 μg L-1 of NO2--N, 190.8 ± 256.0 and 163.6 ± 261.0 μg L-1 of NO3--N, 42.4 ± 44.2 and 104.9 ± 76.2 μg L-1 of PO43--P, 1.0 ± 1.3 and 691 ± 2242 mg L-1 of TN, 0.06 ± 0.06 and 0.08 ± 0.09 mg L-1 of TP, and 0.9 ± 0.6 and 2.0 ± 0.9 μg L-1 of chl-a with significant differences (p < 0.05) between sites and seasons. When waters are transported downstream, nutrient levels are enriched by 4 to 35 times compared to those upstream due to increased population and agriculture downstream, confirming the hypothesis of the study. The calculated TN and TP fluxes were 1.23 × 104 and 3.57 × 101 ton year-1, respectively. Factor analysis indicated that inorganic nitrogen species and phosphorus are the main factors affecting the river water quality. Despite N excess during the rainy season, the river reached mesotrophic waters due to phosphorus limitation. This suggests the need to establish a water quality monitoring program to understand the vulnerability of the river course to changes in its trophic state.
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Affiliation(s)
- M G Fregoso-López
- Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, 04510, Coyoacán, Ciudad de México, Mexico
| | - M A Armienta-Hernández
- Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510, Coyoacán, Ciudad de México, Mexico
- El Colegio de Sinaloa, Centro, Culiacán, Sinaloa, Mexico
| | - S G Alarcón-Silvas
- Posgrado en Ciencias en Recursos Acuáticos, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Av. de los Deportes s/n Ciudad Universitaria, 82017, Mazatlán, Sinaloa, Mexico
| | - J Ramírez-Rochín
- Centro de Investigaciones Biológicas del Noroeste, Av. Instituto Politécnico Nacional 195, 23096, La Paz, Baja California Sur, Mexico
| | - J F Fierro-Sañudo
- Posgrado en Ciencias Agropecuarias, Colegio de Ciencias Agropecuarias, Universidad Autónoma de Sinaloa, Boulevard San Ángel s/n Fraccionamiento San Benito, Predio Las Coloradas, 8000, Culiacán, Sinaloa, Mexico
| | - F Páez-Osuna
- El Colegio de Sinaloa, Centro, Culiacán, Sinaloa, Mexico.
- Instituto de Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Universidad Nacional Autónoma de México, Joel Montes Camarena s/n, 82040, Mazatlán, Sinaloa, Mexico.
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Improvement in municipal wastewater treatment alters lake nitrogen to phosphorus ratios in populated regions. Proc Natl Acad Sci U S A 2020; 117:11566-11572. [PMID: 32385161 DOI: 10.1073/pnas.1920759117] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Large-scale and rapid improvement in wastewater treatment is common practice in developing countries, yet this influence on nutrient regimes in receiving waterbodies is rarely examined at broad spatial and temporal scales. Here, we present a study linking decadal nutrient monitoring data in lakes with the corresponding estimates of five major anthropogenic nutrient discharges in their surrounding watersheds over time. Within a continuous monitoring dataset covering the period 2008 to 2017, we find that due to different rates of change in TN and TP concentrations, 24 of 46 lakes, mostly located in China's populated regions, showed increasing TN/TP mass ratios; only 3 lakes showed a decrease. Quantitative relationships between in-lake nutrient concentrations (and their ratios) and anthropogenic nutrient discharges in the surrounding watersheds indicate that increase of lake TN/TP ratios is associated with the rapid improvement in municipal wastewater treatment. Due to the higher removal efficiency of TP compared with TN, TN/TP mass ratios in total municipal wastewater discharge have continued to increase from a median of 10.7 (95% confidence interval, 7.6 to 15.1) in 2008 to 17.7 (95% confidence interval, 13.2 to 27.2) in 2017. Improving municipal wastewater collection and treatment worldwide is an important target within the 17 sustainable development goals set by the United Nations. Given potential ecological impacts on biodiversity and ecosystem function of altered nutrient ratios in wastewater discharge, our results suggest that long-term strategies for domestic wastewater management should not merely focus on total reductions of nutrient discharges but also consider their stoichiometric balance.
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Vicente-Martínez Y, Caravaca M, Soto-Meca A, De Francisco-Ortiz O, Gimeno F. Graphene oxide and graphene oxide functionalized with silver nanoparticles as adsorbents of phosphates in waters. A comparative study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 709:136111. [PMID: 31884287 DOI: 10.1016/j.scitotenv.2019.136111] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 11/27/2019] [Accepted: 12/12/2019] [Indexed: 05/24/2023]
Abstract
Phosphate removal is an important factor that must be taken into account in eutrophized waters. For this reason, many studies on different ways of removing phosphates from water have been published nowadays. In this work, a comparative study between the use of graphene oxide (GO) and graphene oxide functionalized with silver nanoparticles (GO@AgNPs) as adsorbents to remove phosphates from water samples has been carried out. Experimental conditions, including the pH, adsorbent dose, contact time and temperature, have been analyzed to achieve the highest adsorption efficiency. Although both adsorbents can be considered suitable for removing phosphates from aqueous solutions, GO@AgNPs provided a maximum removal efficiency of 100%, reaching the equilibrium conditions instantaneously under straightforward experimental conditions. Moreover, a much lower adsorbent dose was necessary than with graphene oxide. When GO was used, the maximum removal efficiency was 75%, 9 min were necessary to reach the equilibrium conditions and 20 mg of adsorbent were needed. Both adsorbents can be regenerated in an acid medium, giving recovery percentages of 98% and 80% for GO and GO@AgNPs respectively, which allows them to be recycled and used again.
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Affiliation(s)
- Y Vicente-Martínez
- University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, C/Coronel López Peña s/n, 30720 Santiago de la Ribera, Murcia, Spain.
| | - M Caravaca
- University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, C/Coronel López Peña s/n, 30720 Santiago de la Ribera, Murcia, Spain
| | - A Soto-Meca
- University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, C/Coronel López Peña s/n, 30720 Santiago de la Ribera, Murcia, Spain
| | - O De Francisco-Ortiz
- University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, C/Coronel López Peña s/n, 30720 Santiago de la Ribera, Murcia, Spain
| | - F Gimeno
- University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, C/Coronel López Peña s/n, 30720 Santiago de la Ribera, Murcia, Spain
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Zhou TC, Sun J, Liu M, Shi PL, Zhang XB, Sun W, Yang G, Tsunekawa A. Coupling between plant nitrogen and phosphorus along water and heat gradients in alpine grassland. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 701:134660. [PMID: 31704401 DOI: 10.1016/j.scitotenv.2019.134660] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 09/24/2019] [Accepted: 09/24/2019] [Indexed: 06/10/2023]
Abstract
The biogeochemical cycles of plant nitrogen (N) and phosphorus (P) are interlinked by ecological processes, and the N and P cycles become uncoupled in response to global change experiments. However, the complex natural hydrothermal conditions in arid, semiarid and humid grassland ecosystems may have different effects on the availability of soil nutrients and moisture and may induce different balances between the N and P cycles. Here, we evaluated how the aridity index (AI) affects the balance between N and P of alpine grassland by the collected 115 sites along water and heat availability gradients on the Tibetan Plateau. We found that AI was negatively related to the variation in the coefficients of soil total dissolved N (TDN) and soil availability of P (SAP), and positive effects of AI, TDN and SAP on the coupling of plant N and P were detected. Thus, AI was positively correlated with soil nutrients and moisture, which may favor the co-uptake of soil nutrients by plants, resulting in a small variation in plant N and P in humid environments. Conversely, in arid environments with temporally variable soil nutrients, the plants tend to be more flexible in their N:P stoichiometry. Generally, our findings suggest that plant N and P could be more strongly coupled in humid conditions than in arid environments across alpine grasslands, with potential decoupling of the N biogeochemical cycle from P in an arid environment with an asynchronous dynamic of temperature and precipitation.
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Affiliation(s)
- Tian-Cai Zhou
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
| | - Jian Sun
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Miao Liu
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; Arid Land Research Center, Tottori University, Tottori 6800001, Japan.
| | - Pei-Li Shi
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xu-Bo Zhang
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
| | - Wei Sun
- Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
| | - Gang Yang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Atsushi Tsunekawa
- Arid Land Research Center, Tottori University, Tottori 6800001, Japan.
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Chan AWY, Naphtali J, Schellhorn HE. High-throughput DNA sequencing technologies for water and wastewater analysis. Sci Prog 2019; 102:351-376. [PMID: 31818206 PMCID: PMC10424514 DOI: 10.1177/0036850419881855] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Conventional microbiological water monitoring uses culture-dependent techniques to screen indicator microbial species such as Escherichia coli and fecal coliforms. With high-throughput, second-generation sequencing technologies becoming less expensive, water quality monitoring programs can now leverage the massively parallel nature of second-generation sequencing technologies for batch sample processing to simultaneously obtain compositional and functional information of culturable and as yet uncultured microbial organisms. This review provides an introduction to the technical capabilities and considerations necessary for the use of second-generation sequencing technologies, specifically 16S rDNA amplicon and whole-metagenome sequencing, to investigate the composition and functional potential of microbiomes found in water and wastewater systems.
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Affiliation(s)
| | - James Naphtali
- Department of Biology, McMaster University, Hamilton, ON, Canada
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44
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Yang J, Wang F, Lv J, Liu Q, Nan F, Liu X, Xu L, Xie S, Feng J. Interactive effects of temperature and nutrients on the phytoplankton community in an urban river in China. ENVIRONMENTAL MONITORING AND ASSESSMENT 2019; 191:688. [PMID: 31664528 DOI: 10.1007/s10661-019-7847-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 09/29/2019] [Indexed: 05/12/2023]
Abstract
Understanding the relative impact sizes of environmental factors and nutrients on the high annual variation of phytoplankton abundance in eutrophic rivers is important for aquatic ecosystem management efforts. In this study, we used phytoplankton dynamic datasets in the eutrophic Fenhe River to show the variations and drivers of phytoplankton abundance under complex, fluctuating environmental conditions during 2012-2017. The temporal and spatial variations of nutrients in the river depicted that the total phosphorus (TP) concentration was higher in the wet season and in downstream. There were increases in total nitrogen (TN) concentration in the normal season and in upstream. The structural equation model (SEM) showed that the phytoplankton abundance increased during the wet season despite the decrease in the TN:TP ratio and was reduced upstream due to the highest TN:TP ratio. Among the environmental variables, water temperature (WT) was an important predictor and positively correlated temporally and spatially to phytoplankton. The interaction of nutrients with the phytoplankton community at different temperature levels indicated that different phytoplankton groups have different nutrient requirements. We can conclude that enhances in temperature and TP concentration will significantly increase phytoplankton abundance and dominance of cyanobacteria and green algae in the future, whereas there was insignificant effect on diatoms. These data indicated that temperature and TP content were the important abiotic factors influencing the phytoplankton growth of the water body, which could provide a reference for the evaluation of environmental alterations in the future.
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Affiliation(s)
- Jing Yang
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Fei Wang
- School of Physical Education, Shanxi University, Taiyuan, 030006, China
| | - Junping Lv
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Qi Liu
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Fangru Nan
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Xudong Liu
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Lan Xu
- Department of Natural Resource Management, South Dakota State University, Brookings, SD, 57007, USA
| | - Shulian Xie
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Jia Feng
- School of Life Science, Shanxi University, Taiyuan, 030006, China.
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45
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Abell JM, Özkundakci D, Hamilton DP, van Dam-Bates P, Mcdowell RW. Quantifying the Extent of Anthropogenic Eutrophication of Lakes at a National Scale in New Zealand. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9439-9452. [PMID: 31368301 DOI: 10.1021/acs.est.9b03120] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Quantifying environmental changes relative to ecosystem reference conditions (baseline or natural states) can inform assessment of anthropogenic impacts and the development of restoration objectives and targets. We developed statistical models to predict current and reference concentrations of total nitrogen (TN) and total phosphorus (TP) in surface waters for a nationally representative sample of ≥1033 New Zealand lakes. The lake-specific nutrient concentrations reflected variation in factors including anthropogenic nutrient loads, hydrology, geology, elevation, climate, and lake and catchment morphology. Changes between reference and current concentrations were expressed to quantify the magnitude of anthropogenic eutrophication. Overall, there was a clear increase in lake trophic status, with the most common trophic status being oligotrophic under a reference state and mesotrophic under current conditions. The magnitude of departure from reference state varied considerably within the sample; however, on average, the mean TN concentration approximately doubled between reference and current states, whereas the mean TP concentration increased approximately 4-fold. This study quantified the extent of water quality degradation across lake types at a national scale, thereby informing ecological restoration objectives and the potential to reduce anthropogenic nutrient loads, while also providing a modeling framework that can be applied to lakes elsewhere.
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Affiliation(s)
- Jonathan M Abell
- Ecofish Research Limited , Suite 1220-1175 Douglas Street , Victoria , British Columbia Canada
| | - Deniz Özkundakci
- Environmental Research Institute , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand
- Waikato Regional Council , Hamilton , New Zealand
| | - David P Hamilton
- Environmental Research Institute , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand
- Australian Rivers Institute, Griffith University , 170 Kessels Road , Nathan , Queensland 4111 , Australia
| | - Paul van Dam-Bates
- Ecofish Research Limited , Suite 1220-1175 Douglas Street , Victoria , British Columbia Canada
| | - Richard W Mcdowell
- AgResearch , Lincoln Science Centre , Private Bag 4749 , Christchurch 8140 , New Zealand
- Soil and Physical Sciences, Faculty of Agriculture and Life Sciences , PO Box 84, Lincoln University , Lincoln 7647 , Christchurch New Zealand
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46
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Affiliation(s)
- Carles Ibáñez
- IRTA, Department of Marine and Continental Waters, 43540 Sant Carles de la Ràpita, Catalonia, Spain
| | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain
- CREAF, 08193 Cerdanyola del Vallès, Catalonia, Spain
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Hernandez-Ramirez AG, Martinez-Tavera E, Rodriguez-Espinosa PF, Mendoza-Pérez JA, Tabla-Hernandez J, Escobedo-Urías DC, Jonathan MP, Sujitha SB. Detection, provenance and associated environmental risks of water quality pollutants during anomaly events in River Atoyac, Central Mexico: A real-time monitoring approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 669:1019-1032. [PMID: 30970451 DOI: 10.1016/j.scitotenv.2019.03.138] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 03/09/2019] [Accepted: 03/09/2019] [Indexed: 06/09/2023]
Abstract
River Atoyac is considered to be one of the most polluted rivers in Mexico due to the discharges of untreated or partially treated wastewater from industrial and municipal activities. In order to improve the river water quality, it is obligatory to identify the possible contaminant sources for upholding a well-balanced ecosystem. Henceforth, the present study incorporates the application of a continuous real-time monitoring system to identify the provenance of pollutants of the river mainly from anomaly events. Four monitoring stations were installed all along the River Atoyac in the State of Puebla, Central Mexico. The real-time monitoring systems have an ability to measure various water quality parameters for every 15 minutes such as Temperature (T), pH, Conductivity (EC), turbidity (TURB), Dissolved Oxygen (DO), Oxidation Reduction Potential (ORP) and Spectral Absorption Coefficient (SAC). In total, eight water samples of anomaly events (i.e.) 2 per monitoring station during rainy (August-September) and winter seasons (November-December), that were detected using the parameters previously mentioned were procured and also analyzed in the laboratory for evaluating almost 54 physicochemical, inorganic and organic characteristics. Statistical results of factorial analysis explained that 30% of the total variance corresponded to textile effluents, 23% related to discharges produced by automobile and petrochemical industries, and 18% of the total variance defined the agricultural activities. Additionally, indices like Overall Index Pollution, Heavy Metal Evaluation Index, Screening Quick Reference Table and Molecular ratios of hydrocarbons for PAH sources was also calculated to estimate the grade of pollution and associated ecotoxicological risks. The present study also enlightens the fact that the assessed results will definitely provide valuable information for the management of river water quality by developing stringent public policies by governmental agencies for the sustainable conservation of Atoyac River.
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Affiliation(s)
- A G Hernandez-Ramirez
- Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Del. Gustavo A. Madero, C.P. 07340 Ciudad de México (CDMX), Mexico
| | - E Martinez-Tavera
- Universidad Popular Autónoma del Estado de Puebla (UPAEP), 17 sur no. 901 Barrio de Santiago, Puebla C.P. 72410, Mexico.
| | - P F Rodriguez-Espinosa
- Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Del. Gustavo A. Madero, C.P. 07340 Ciudad de México (CDMX), Mexico
| | - J A Mendoza-Pérez
- Escuela Nacional de Ciencias Biológicas (ENCB), Instituto Politécnico Nacional (IPN), Prolongación de Carpio y Plan de Ayala S/N, Miguel Hidalgo, Santo Tomas, C.P. 07738 Ciudad de México (CDMX), Mexico
| | - J Tabla-Hernandez
- Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Del. Gustavo A. Madero, C.P. 07340 Ciudad de México (CDMX), Mexico
| | - D C Escobedo-Urías
- Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional, (CIIDIR-Sinaloa), Instituto Politécnico Nacional (IPN), Bulevar Juan de Dios Batiz Paredes #250 Colonia San Joachin. Guasave, C.P. 51101, Sinaloa, Mexico
| | - M P Jonathan
- Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Del. Gustavo A. Madero, C.P. 07340 Ciudad de México (CDMX), Mexico
| | - S B Sujitha
- Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Del. Gustavo A. Madero, C.P. 07340 Ciudad de México (CDMX), Mexico
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Waters MN, Metz AP, Smoak JM, Turner H. Chronic prescribed burning alters nutrient deposition and sediment stoichiometry in a lake ecosystem. AMBIO 2019; 48:672-682. [PMID: 30173399 PMCID: PMC6486939 DOI: 10.1007/s13280-018-1094-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 08/06/2018] [Accepted: 08/20/2018] [Indexed: 06/08/2023]
Abstract
Prescribed fire is a common management practice for forests and other terrestrial environments. Following a prescribed burn, ash erodes into aquatic environments potentially altering terrestrial-aquatic connectivity and water quality. In this study, we collected a sediment core from Ocean Pond, FL, USA, a lake that has received fire ash from decades of prescribed burning events. Paleolimnological measurements of macrocharcoal, nutrients, stable isotopes (δ13C, δ15N), and photosynthetic pigments were used to reconstruct fire regimes, material inputs, and lake primary producer responses for periods of prescribed burns and other lake periods throughout the last 8000 years [corrected]. Results show that the period of repeated modern-prescribed fires coincided with decreased C and N depositions in the lake, while P deposition increased causing alterations to nutrient storage and stoichiometry. However, photosynthetic pigments indicated low primary producer abundance during the prescribed fire period. These changes in nutrient dynamics could provide new insights into biogeochemical pathways in land-water connected systems where burning has not been considered.
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Affiliation(s)
- Matthew N. Waters
- Crop, Soil and Environmental Sciences Department, Auburn University, 201 Funchess Hall, Auburn, AL 36849 USA
| | - Alexander P. Metz
- Crop, Soil and Environmental Sciences Department, Auburn University, 201 Funchess Hall, Auburn, AL 36849 USA
| | - Joseph M. Smoak
- Environmental Science University of South Florida, St. Petersburg, FL USA
| | - Hunter Turner
- Biology Department, Valdosta State University, Valdosta, GA 31698 USA
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Shan K, Song L, Chen W, Li L, Liu L, Wu Y, Jia Y, Zhou Q, Peng L. Analysis of environmental drivers influencing interspecific variations and associations among bloom-forming cyanobacteria in large, shallow eutrophic lakes. HARMFUL ALGAE 2019; 84:84-94. [PMID: 31128816 DOI: 10.1016/j.hal.2019.02.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 01/27/2019] [Accepted: 02/01/2019] [Indexed: 06/09/2023]
Abstract
Non-diazotrophic Microcystis and filamentous N2-fixing Aphanizomenon and Dolichospermum (formerly Anabaena) co-occur or successively dominate freshwaters globally. Previous studies indicate that dual nitrogen (N) and phosphorus (P) reduction is needed to control cyanobacterial blooms; however, N limitation may cause replacement of non-N2-fixing by N2-fixing taxa. To evaluate potentially counterproductive scenarios, the effects of temperature, nutrients, and zooplankton on the spatio-temporal variations of cyanobacteria were investigated in three large, shallow eutrophic lakes in China. The results illustrate that the community composition of cyanobacteria is primarily driven by physical factors and the zooplankton community, and their interactions. Niche differentiation between Microcystis and two N2-fixing taxa in Lake Taihu and Lake Chaohu was observed, whereas small temperature fluctuations in Lake Dianchi supported co-dominance. Through structural equation modelling, predictor variables were aggregated into 'composites' representing their combined effects on species-specific biomass. The model results showed that Microcystis biomass was affected by water temperature and P concentrations across the studied lakes. The biomass of two filamentous taxa, by contrast, exhibited lake-specific responses. Understanding of driving forces of the succession and competition among bloom-forming cyanobacteria will help to guide lake restoration in the context of climate warming and N:P stoichiometry imbalances.
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Affiliation(s)
- Kun Shan
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Science, Chongqing, 400714, China.
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Wei Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Lin Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Liming Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Yanlong Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Yunlu Jia
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Qichao Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Liang Peng
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
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50
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Shan K, Shang M, Zhou B, Li L, Wang X, Yang H, Song L. Application of Bayesian network including Microcystis morphospecies for microcystin risk assessment in three cyanobacterial bloom-plagued lakes, China. HARMFUL ALGAE 2019; 83:14-24. [PMID: 31097252 DOI: 10.1016/j.hal.2019.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 12/12/2018] [Accepted: 01/09/2019] [Indexed: 05/23/2023]
Abstract
Microcystis spp., which occur as colonies of different sizes under natural conditions, have expanded in temperate and tropical freshwater ecosystems and caused seriously environmental and ecological problems. In the current study, a Bayesian network (BN) framework was developed to access the probability of microcystins (MCs) risk in large shallow eutrophic lakes in China, namely, Taihu Lake, Chaohu Lake, and Dianchi Lake. By means of a knowledge-supported way, physicochemical factors, Microcystis morphospecies, and MCs were integrated into different network structures. The sensitive analysis illustrated that Microcystis aeruginosa biomass was overall the best predictor of MCs risk, and its high biomass relied on the combined condition that water temperature exceeded 24 °C and total phosphorus was above 0.2 mg/L. Simulated scenarios suggested that the probability of hazardous MCs (≥1.0 μg/L) was higher under interactive effect of temperature increase and nutrients (nitrogen and phosphorus) imbalance than that of warming alone. Likewise, data-driven model development using a naïve Bayes classifier and equal frequency discretization resulted in a substantial technical performance (CCI = 0.83, K = 0.60), but the performance significantly decreased when model excluded species-specific biomasses from input variables (CCI = 0.76, K = 0.40). The BN framework provided a useful screening tool to evaluate cyanotoxin in three studied lakes in China, and it can also be used in other lakes suffering from cyanobacterial blooms dominated by Microcystis.
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Affiliation(s)
- Kun Shan
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
| | - Mingsheng Shang
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Botian Zhou
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Lin Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Xiaoxiao Wang
- CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong Yang
- Department of Geography and Environmental Science, University of Reading, Whiteknights, Reading, RG6 6AB, UK
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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