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Gong JC, Li BH, Hu JW, Li PF, Liu Q, Yang GP, Liu CY. Driving force of tidal pulses on denitrifiers-dominated nitrogen oxide emissions from intertidal wetland sediments. WATER RESEARCH 2023; 247:120770. [PMID: 37897991 DOI: 10.1016/j.watres.2023.120770] [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: 05/19/2023] [Revised: 09/12/2023] [Accepted: 10/20/2023] [Indexed: 10/30/2023]
Abstract
Intertidal wetland sediments are an important source of atmospheric nitrogen oxides (NOx), but their contribution to the global NOx budget remains unclear. In this work, we conducted year-round and diurnal observations in the intertidal wetland of Jiaozhou Bay to explore their regional source-sink patterns and influence factors on NOx emissions (initially in the form of nitric oxide) and used a dynamic soil reactor to further extend the mechanisms underlying the tidal pulse of nitric oxide (NO) observed in our investigations. The annual fluxes of NOx in the vegetated wetland were significantly higher than those in the wetland without vegetation. Their annual variations could be attributed to changes in temperature and the amount of organic carbon in the sediment, which was derived from vegetated plants and promoted the carbon-nitrogen cycle. Anaerobic denitrifiers had advantages in the intertidal wetland sediment and accounted for the major NO production (63.8 %) but were still limited by nitrite and nitrate concentrations in the sediment. Moreover, the tidal pulse was likely a primary driver of NOx emissions from intertidal wetlands over short periods, which was not considered in previous investigations. The annual NO exchange flux considering the tide pulse contribution (8.93 ± 1.72 × 10-2 kg N ha-1 yr-1) was significantly higher than that of the non-pulse period (4.14 ± 1.13 × 10-2 kg N ha-1 yr-1) in our modeling result for the fluxes over the last decade. Therefore, the current measurement of NOx fluxes underestimated the actual gas emission without considering the tidal pulse.
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Affiliation(s)
- Jiang-Chen Gong
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Bing-Han Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Jing-Wen Hu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Pei-Feng Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Qian Liu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Gui-Peng Yang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
| | - Chun-Ying Liu
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
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Pan X, Liu S, Li R, Sun H, Feng J, Cheng X, Yao J. Research on the purification enhancement of ecological ponds: Integrating water cycle optimization and plants layout. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118487. [PMID: 37393871 DOI: 10.1016/j.jenvman.2023.118487] [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: 03/29/2023] [Revised: 06/17/2023] [Accepted: 06/21/2023] [Indexed: 07/04/2023]
Abstract
The hydrodynamic conditions of ponds are generally poor, which seriously affects the long-term water quality guarantee. In this research, the numerical simulation method was used to establish an integrated model of hydrodynamics and water quality for the simulation of the plant purification effect in ponds. Based on the flushing time using the tracer method, the purification rate of plants was introduced to consider the purification effect of plants on water quality. In-situ monitoring was carried out at the Luxihe pond in Chengdu, and the model parameters such as the purification rate of typical plants were calibrated. The degradation coefficient of NH3-N in the non-vegetated area was 0.014 d-1 in August and 0.010 d-1 in November. In areas with vegetation, the purification rate of NH3-N was 0.10-0.20 g/(m2·d) in August and 0.06-0.12 g/(m2·d) in November. The comparison of the results in August and November showed that due to the higher temperature in August, the plant growth effect was better, and the degradation rate of pollutants and the purification rate of pollutants by plants were higher. The flushing time distribution of the proposed Baihedao pond under the conditions of terrain reconstruction, water replenishment, and plant layout was simulated, and the frequency distribution curve of flushing time was used to evaluate the results. Terrain reconstruction and water replenishment can significantly improve the water exchange capacity of ponds. The reasonable planting of plants can reduce the variability of the water exchange capacity. Based on this combined with the purification effect of plants on NH3-N, the layout plan of Canna, Cattails, and Thalia in ponds was proposed.
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Affiliation(s)
- Xiangdong Pan
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Shengyun Liu
- PowerChina Chengdu Engineering Corporation Limited, Chengdu, 610031, China
| | - Ran Li
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China.
| | - Hailong Sun
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China.
| | - Jingjie Feng
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Xiaolong Cheng
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Jia Yao
- Dujiangyan Water Authority, Chengdu, 611800, China
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Kong F, Wang J, Hou W, Cui Y, Yu L, Zhang Y, Wang S. Influence of modified biochar supported sulfidation of nano-zero-valent-iron (S-nZVI/BC) on nitrate removal and greenhouse gas emission in constructed wetland. J Environ Sci (China) 2023; 125:568-581. [PMID: 36375939 DOI: 10.1016/j.jes.2022.02.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 06/16/2023]
Abstract
In this study, the biochar (BC) produced from sawdust, sludge, reed and walnut were used to support sulfidation of nano-zero-valent-iron (S-nZVI) to enhance nitrate (NO3--N) removal and investigate the impact on greenhouse gas emissions. Batch experiment results showed the S-nZVI/BCsawdust (2:1, 500), S-nZVI/BCsludge (2:1, 900), S-nZVI/BCreed (2:1, 700), and S-nZVI/BC walnut (2:1, 700) respectively improved NO3--N removal efficiencies by 22%, 20%, 3% and 0.1%, and the selectivity toward N2 by 22%, 25%, 22% and 18%. S-nZVI uniformly loaded on BC provided electrons for the conversion of NO3--N to N2 through Fe0. At the same time, FeSx layer was formed on the outer layer of ZVI in the sulfidation process to prevent iron oxidation, so as to improve the electrons utilization efficiency After adding four kinds of S-nZVI/BC into constructed wetlands (CWs), the NO3--N removal efficiencies could reach 100% and the N2O emission fluxes were reduced by 24.17%-36.63%. And the average removal efficiencies of TN, COD, TP were increased by 21.9%, -16.5%, 44.3%, repectively. The increasing relative abundances of denitrifying bacteria, such as Comamonas and Simplicispira, suggested that S-nZVI/BC could also improve the process of microbial denitrification. In addition, different S-nZVI/BC had different effects on denitrification functional genes (narG, nirk, nirS and nosZ genes), methanotrophs (pmoA) and methanogenesis (mcrA). This research provided an effective method to improve NO3--N removal and reduce N2O emission in CWs.
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Affiliation(s)
- Fanlong Kong
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Junru Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Weihao Hou
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Yuqian Cui
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Lihua Yu
- Qingdao Environmental Protection Bureau, Laixi Branch, Qingdao 266699, China
| | - Yi Zhang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Sen Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
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Wang Y, Bai J, Zhang L, Liu H, Wang W, Liu Z, Zhang G. Advances in studies on the plant rhizosphere microorganisms in wetlands: A visualization analysis based on CiteSpace. CHEMOSPHERE 2023; 317:137860. [PMID: 36649898 DOI: 10.1016/j.chemosphere.2023.137860] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/29/2022] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Rhizosphere microorganisms and their interactions with plants in wetlands have recently attracted much attention due to their importance in enhancing plant environmental adaptation, removing wetland pollutants, and alleviating climate change. However, the fluctuating hydrological environment of wetlands leads to more complex dynamics in the rhizosphere environment. Research progress and hotspots concerning plant-rhizosphere microorganisms under special wetland environments are still kept unclear. To better understand the current research status, hotspots and trends of rhizosphere microorganisms in wetlands, we used CiteSpace bibliometric software to visualize and analyze 231 English-language publications from the Web of Science core collection database. Here, we reviewed the role played by various countries, institutions, and scholars in the studies of plant rhizosphere microorganisms in wetlands based on cooperation network analysis. We discussed the shift from bioremediation and nutrient removal to rhizosphere microbial community composition as a research hotspot for plant rhizosphere microorganisms in wetlands according to keyword co-occurrence and clustering analysis. Finally, we highlighted that more attention should be paid to the ecological functions of rhizosphere microorganisms in different wetland ecosystems, and the plant‒microbe microinterface processes and interaction patterns should be explored in depth to provide new indicators for the evaluation of wetland ecosystem functions.
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Affiliation(s)
- Yaqi Wang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
| | - Junhong Bai
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China.
| | - Ling Zhang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
| | - Haizhu Liu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
| | - Wei Wang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
| | - Zhe Liu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
| | - Guangliang Zhang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China
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Yao C, Qingyu W, Zhen L, Renyu C, Qihong C, Shaochun Y, Qiong W, Yinghui T. Nitrogen process in stormwater bioretention: effect of the antecedent dry days on the relative abundance of nitrogen functional genes. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 86:1269-1283. [PMID: 36358060 DOI: 10.2166/wst.2022.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In this study, we evaluated the relative abundance of nitrogen functional genes (amoA, nirK and nirS) involved in ammonia oxidation and denitrification bacteria in laboratory-scale bioretention columns in response to environmental factors (e.g., moisture content, pH, soil organic matter, soil nitrogen) under different antecedent dry days (ADDs). We observed a decrease tendency of the relative abundance of ammonia-oxidizing bacteria at first and then increased when increasing ADDs from 1 to 22 day, while the relative abundance of denitrifying bacteria showed a downward trend. The abundance of bacteria gene amoA was positively associated with soil ammonia nitrogen concentration (r2 = 0.389, p < 0.05) and soil organic matter concentration (r2 = 0.334, p < 0.05), while the abundance of bacteria gene nirS was positively correlated with soil ammonia nitrogen (r2 = 0.730, p < 0.01), soil organic matter (r2 = 0.901, p < 0.01) and soil total nitrogen (r2 = 0.779, p < 0.01). Furthermore, gene counts for bacteria gene nirS were correlated negatively with plant root length (r2 = 0.364, p < 0.05) and plant biomass (r2 = 0.381, p < 0.05). Taken together, these results suggest that both nitrification and denitrification can occur in bioretention systems, which can be affected by environmental factors.
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Affiliation(s)
- Chen Yao
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail: ; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074, China
| | - Wu Qingyu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail:
| | - Liu Zhen
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail: ; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074, China
| | - Chen Renyu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail:
| | - Cheng Qihong
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail:
| | - Yuan Shaochun
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail: ; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing 400074, China
| | - Wu Qiong
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail:
| | - Tang Yinghui
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China E-mail:
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Monteverde S, Healy M, O'Leary D, Daly E, Callery O. Management and rehabilitation of peatlands: The role of water chemistry, hydrology, policy, and emerging monitoring methods to ensure informed decision making. ECOL INFORM 2022. [DOI: 10.1016/j.ecoinf.2022.101638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Abstract
Despite occupying an area no greater than 8% of the earth’s surface, natural wetland ecosystems fulfill multiple ecological functions: 1. Soil formation and stabilization support, 2. Food, water, and plant biomass supply, 3. Cultural/recreational services, landscape, and ecological tourism, 4. Climate regulation, and 5. Carbon sequestration; with the last one being its most important function. They are subject to direct and indirect incident factors that affect plant productivity and the sequestration of carbon from the soil. Thus, the objective of this review was to identify the incident factors in the loss of area and carbon sequestration in marine, coastal, and continental wetlands that have had an impact on climate change in the last 14 years, globally. The methodology consisted of conducting a literature review in international databases, analyzing a sample of 134 research studies from 37 countries, organized in tables and figures supported by descriptive statistics and content analysis. Global results indicate that agriculture (25%), urbanization (16.8%), aquaculture (10.7%), and industry (7.6%) are incident factors that promote wetlands effective loss affecting continental wetlands more than coastal and marine ones. Regarding carbon sequestration, this is reduced by vegetation loss since GHG emissions raise because the soil is exposed to sun rays, increasing surface temperature and oxidation, and raising organic matter decomposition and the eutrophication phenomenon caused by the previous incident factors that generate wastewater rich in nutrients in their different activities, thus creating biomass and plant growth imbalances, either at the foliage or root levels and altering the accumulation of organic matter and carbon. It is possible to affirm in conclusion that the most affected types of wetlands are: mangroves (25.7%), lagoons (19.11%), and marine waters (11.7%). Furthermore, it was identified that agriculture has a greater incidence in the loss of wetlands, followed by urbanization and industry in a lower percentage.
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Ye M, Zheng W, Yin C, Fan X, Chen H, Gao Z, Zhao Y, Liang Y. The inhibitory efficacy of procyanidin on soil denitrification varies with N fertilizer type applied. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150588. [PMID: 34582856 DOI: 10.1016/j.scitotenv.2021.150588] [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: 07/07/2021] [Revised: 08/23/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Denitrification is a major process of the nitrogen (N) cycle by converting nitrate (NO3-) back to gaseous nitrogen (N2), which leads to massive losses of N, including fertilizer N, from agricultural systems. One mitigation strategy for these N losses involves denitrification inhibition by plant-derived biological denitrification inhibitors (BDIs). Procyanidin was recently identified as a new class of BDI in root extracts from Fallopia spp. However, the efficacy of this compound on soil denitrification under different N fertilizer sources is not well understood. Here, a 14-day microcosm experiment was conducted using three nitrate-based fertilizers (NH4NO3, KNO3, and Ca(NO3)2) to investigate the impact of procyanidin on soil denitrification and associated microbial pathways. Results showed that procyanidin inhibited denitrification activity regardless of the source of N fertilizer applied, but the inhibitory efficacy of procyanidin varied with N fertilizer types. Addition of procyanidin had greater denitrification inhibition in the soils applied with NH4NO3 than with other types of N fertilizer. Moreover, nitrate reductase activity was significantly suppressed by procyanidin addition across all three N fertilizers tested. Quantification of denitrifying functional genes (nirS, nirK, and nosZ) demonstrated that procyanidin inhibited the activity and growth of nirS- and nirK-type denitrifiers, but stimulated the growth of nosZI-containing denitrifiers. These findings indicate that the inhibition of soil denitrification by procyanidin was mainly a result of the suppression of nitrate reductase activity and nirS- and nirK-type denitrifiers abundance. The use of procyanidin together with N fertilizers, especially NH4NO3, can be an effective way to reduce the N losses by denitrification.
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Affiliation(s)
- Mujun Ye
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Wanning Zheng
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Chang Yin
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaoping Fan
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Hao Chen
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Zixiang Gao
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuhua Zhao
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yongchao Liang
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China.
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Xu Y, Lu J, Huang S, Zhao J. Submerged plants alleviated the impacts of increased ammonium pollution on anammox bacteria and nirS denitrifiers in the rhizosphere. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:58755-58767. [PMID: 34120278 DOI: 10.1007/s11356-021-14715-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 05/31/2021] [Indexed: 06/12/2023]
Abstract
Excess nitrogen input into water bodies can cause eutrophication and affect the community structure and abundance of the nitrogen-transforming microorganisms; thus, it is essential to remove nitrogen from eutrophic water bodies. Aquatic plants can facilitate the growth of rhizosphere microorganisms. This study investigated the impact of ammonium pollution on the anammox and denitrifying bacteria in the rhizosphere of a cultivated submerged macrophyte, Potamogeton crispus (P. crispus) by adding three different concentrations of slow-release urea (0, 400, 600 mg per kg sediment) to the sediment to simulate different levels of nitrogen pollution in the lake. Results showed that the ammonium concentrations in the interstitial water under three pollution treatments were significantly different, but the nitrate concentration remained stable. The abundance of anammox 16S rRNA and nitrite reductase (nirS) gene in rhizosphere sediments exhibited no significant differences under the three pollution conditions. The increase in the nitrogen pollution levels did not significantly affect the growth of anammox bacteria and nirS denitrifying bacteria (denitrifiers). The change trend of the abundance ratio of (anammox 16S rRNA)/nirS in different nitrogen treatment groups on the same sampling date was very close, indicating that this ratio was not affected by ammonium pollution levels when P. crispus existed. The redundancy analysis showed that there was a positive correlation between the abundance of anammox 16S rRNA and nirS gene and that the abundance of these bacteria was significantly affected by the mole ratio of NH4+/NO3-. This study reveals that submerged plants weaken the environmental changes caused by ammonia pollution in the rhizosphere, thereby avoiding strong fluctuation of anammox bacteria and nirS denitrifiers.
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Affiliation(s)
- Yangfan Xu
- Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan, 430040, China
- Key Laboratory of Large-span Bridge Construction Technology, Wuhan, 430040, China
- CCCC Second Harbor Engineering Company Ltd., Wuhan, 430040, China
| | - Jing Lu
- Australian Rivers Institute, Griffith University, QLD, Nathan, 4111, Australia
| | - Shanshan Huang
- Laboratory of Eco-Environmental Engineering Research, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, 430070, Hubei Province, China
| | - Jianwei Zhao
- Laboratory of Eco-Environmental Engineering Research, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, 430070, Hubei Province, China.
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Ma H, Gao X, Chen Y, Zhu J, Liu T. Fe(II) enhances simultaneous phosphorus removal and denitrification in heterotrophic denitrification by chemical precipitation and stimulating denitrifiers activity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 287:117668. [PMID: 34426390 DOI: 10.1016/j.envpol.2021.117668] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 06/15/2021] [Accepted: 06/24/2021] [Indexed: 06/13/2023]
Abstract
Using Fe(II) salt as the precipitant in heterotrophic denitrification achieves improved TP removal, and enhancement in denitrification was often observed. This study aimed to obtain a better understanding of Fe(II)-enhanced denitrification with sufficient carbon source supply. Laboratory-scale experiments were conducted in SBRs with or without Fe(II) addition. Remarkably improved TP removal was experienced. TP removal efficiency in Fe(II) adding reactor was 85.8 ± 3.4%; whereas, that in the reactor without Fe(II) addition was 31.1 ± 2.8%. Besides improved TP removal, better TN removal efficiency (94.1 ± 1.1%) were recorded when Fe(II) was added, and that in the reactor without Fe(II) addition was 89 ± 0.8%. The specific denitrification rate were observed increase by 12.6% when Fe(II) was added. Further microbial analyses revealed increases in the abundances of typical denitrifiers (i.e. Niastella, Opitutus, Dechloromonas, Ignavibacterium, Anaeromyxobacter, Pedosphaera, and Myxococcus). Their associated denitrifying genes, narG, nirS, norB, and nosZ, were observed had 14.2%, 19.4%, 21.6%, and 9.9% elevation, respectively. Such enhancement in denitrification shall not be due to nitrate-dependent ferrous oxidation, which prevails in organic-deficient environments. In an environment with a continuous supply of Fe(II) and plenty of carbon sources, a cycle of denitrifying enzyme activity enhancement in the presence of Fe(II) facilitating nitrogen substrate utilization, stimulating denitrifier metabolism and growth, elevating denitrifying genes abundance, and increasing denitrifying enzymes expression were thought to be responsible for the Fe(II)-enhanced heterotrophic denitrification. Fe(II) salt is often a less expensive precipitant and has recently become attractive for TP removal in wastewater. The findings of this study solidify previous observation of enhancement of both TP and TN removal by adding Fe(II) in denitrification, and would be helpful for developing cost-effective pollutant removal processes.
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Affiliation(s)
- Hang Ma
- Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Xinlei Gao
- Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; Guangdong Water Co., Ltd, Shenzhen, 518021, China
| | - Yihua Chen
- Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Jiaxin Zhu
- Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Tongzhou Liu
- Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
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Wang Y, Cui X, Chen F, He S. Cyclic utilization of reed litters to enhance nitrogen removal efficiency in simulated estuarine wetland. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:39071-39081. [PMID: 33745057 DOI: 10.1007/s11356-021-13485-6] [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: 10/25/2020] [Accepted: 03/11/2021] [Indexed: 06/12/2023]
Abstract
Reed is a common species in China's estuarine wetlands, contains high carbon and low nitrogen, and its litters have potential to be reused as external carbon source to achieve denitrification efficiency enhancement in estuarine wetlands. In this study, leaching experiments of reed leaf and stem under estuarine wetland salinity were conducted, and a certain amount of reed litters was then added into simulated estuarine wetlands under 0‰ and 7‰ salinity respectively. It was observed that reed litters had a higher release of total organic carbon (TOC) under 7‰ salinity than 0‰ salinity, and reed leaf litters released more TOC than stem litters did. Meantime, it was found that salinity had a more significant effect on TOC leached from stems than from leaves. In simulated estuarine wetlands, NO3--N removal rates were found to be improved about 20% under 7‰ salinity and 25% under 0‰ salinity in average after the addition of mixed litters, and almost no additional improvement in NO3--N removal was found after leaf-only litter addition compared with mixed litter addition. Besides, mixed litter addition could work two weeks longer than leaf-only litter addition. Moreover, the microbial community change was analyzed by high-throughput sequencing and found that litter addition could increase the denitrification-related genera and then increased the NO3--N removal efficiency. For simulated estuarine wetland, reed litter addition could achieve better nitrogen removal efficiency.
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Affiliation(s)
- Yanan Wang
- China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Xijun Cui
- China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Fanfan Chen
- China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Shengbing He
- China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dong Chuan Road 800, Shanghai, 200240, People's Republic of China.
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12
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Palacios MM, Trevathan-Tackett SM, Malerba ME, Macreadie PI. Effects of a nutrient enrichment pulse on blue carbon ecosystems. MARINE POLLUTION BULLETIN 2021; 165:112024. [PMID: 33549995 DOI: 10.1016/j.marpolbul.2021.112024] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 01/09/2021] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
Coastal ecosystems are under increasing pressure from land-derived eutrophication in most developed coastlines worldwide. Here, we tested for 277 days the effects of a nutrient pulse on blue carbon retention and cycling within an Australian temperate coastal system. After 56 days of exposure, saltmarsh and mangrove plots subject to a high-nutrient treatment (~20 g N m-2 yr-1 and ~2 g P m-2 yr-1) had ~23% lower superficial soil carbon stocks. Mangrove plots also experienced a ~33% reduction in the microbe Amplicon Sequence Variant richness and a shift in community structure linked to elevated ammonium concentrations. Live plant cover, tea litter decomposition, and soil carbon fluxes (CO2 and CH4) were not significantly affected by the pulse. Before the end of the experiment, soil carbon- and nitrogen-cycling had returned to control levels, highlighting the significant but short-lived impact that a nutrient pulse can have on the carbon sink capacity of coastal wetlands.
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Affiliation(s)
- Maria M Palacios
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, 221 Burwood Hwy, VIC 3125, Australia.
| | - Stacey M Trevathan-Tackett
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, 221 Burwood Hwy, VIC 3125, Australia.
| | - Martino E Malerba
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, 221 Burwood Hwy, VIC 3125, Australia.
| | - Peter I Macreadie
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, 221 Burwood Hwy, VIC 3125, Australia.
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13
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Galliari J, Santucci L, Misseri L, Carol E, Alvarez MDP. Processes controlling groundwater salinity in coastal wetlands of the southern edge of South America. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 754:141951. [PMID: 32898785 DOI: 10.1016/j.scitotenv.2020.141951] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 08/20/2020] [Accepted: 08/22/2020] [Indexed: 06/11/2023]
Abstract
The Argentine Atlantic coast constitutes an extensive area where numerous wetlands develop under humid, semi-arid and arid conditions, in which there are also variations in relation to tidal influence with estuarine, mixing and marine areas. The aim of this work is to conduct a comparative study on the processes controlling the groundwater salinity in medium to high latitudinal coastal wetlands of four natural reserves with contrasting hydrological and climatic conditions. In each study area a monitoring network was established where the content of CO32-, HCO3-, Cl-, SO42-, Ca2+, Mg2+, Na+, K+, δ2H and δ18O of the water were determined. The results show a saline groundwater increase along a latitudinal gradient with electrical conductivities varying from 0.3 mS/cm at 34°47' S to 154 mS/cm at 42° 25' S. The results obtained show that the ionic contents in groundwater are partially controlled by the salinity of the tidal flood water whose electrical conductivity varies from 0.3 mS/cm in the Río de la Plata estuary to 52 mS/cm in the sea water of the southern study area. In the southern wetlands, where an increase of aridity is also registered, there is a clear increase in groundwater ionic concentrations, which occurs without isotopic enrichment indicating processes of salts dissolution of the sediments. The evaporites precipitation occurs due to the total evaporation of the tidal water that floods the wetlands in spring high tides. The salinization of groundwater responds to natural processes inherent to the hydrological, climatic and lithological characteristics of each wetland. Given that the areas studied correspond to natural reserves, the results generate databases that will allow the identification of future changes in salinity associated with anthropic influences or changes in hydrological and/or climatic conditions as a result of climate change.
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Affiliation(s)
| | - Lucía Santucci
- Centro de Investigaciones Geológicas. CIG-CONICET-UNLP, Argentina
| | - Lucas Misseri
- Instituto Patagónico Para el estudio de los Ecosistemas Continentales. IPEEC-CONICET, Argentina
| | - Eleonora Carol
- Centro de Investigaciones Geológicas. CIG-CONICET-UNLP, Argentina.
| | - María Del Pilar Alvarez
- Instituto Patagónico Para el estudio de los Ecosistemas Continentales. IPEEC-CONICET, Argentina.
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14
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Sun H, He Z, Zhang M, Yen L, Cao Y, Hu Z, Peng Y, Lee SY. Spatial variation of soil properties impacted by aquaculture effluent in a small-scale mangrove. MARINE POLLUTION BULLETIN 2020; 160:111511. [PMID: 32861934 DOI: 10.1016/j.marpolbul.2020.111511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 07/21/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Small-scale mangroves serve ecological functions similar to large-scale mangroves regarding biological conservation, environmental purification, and supporting biogeochemical processes. The rising aquaculture neighboring mangroves results in their serving as an important sink for massive nutrients and pollutants from aquaculture effluent. We assessed how long-term aquaculture effluent discharge influenced the soil properties of a mangrove-tidal flat continuum using field survey and geostatistics. Common soil physical-chemical properties presented significant spatial variability. Continued aquaculture effluent discharge caused a significant cumulation of soil total organic carbon (SOC) (64.13 g·kg-1), total nitrogen (TN) (2.44 g·kg-1) and total phosphorus (TP) (1.12 g·kg-1) in the mangrove soil, which were as 2-3 times as those on the mudflat. Most of the soil properties changed significantly with increasing distance from the effluent outlet along a tidal channel, and the maximum concentrations of SOC, TN and TP all occurred at 50 m away from the outlet. The results of principal component analysis indicated that aquaculture effluent significantly affected the spatial pattern of soil properties along the mangrove-tidal flat continuum. Continued aquaculture effluent input rendered extensive accumulation of SOC, TN and TP in the mangroves. The spatial heterogeneity of mangrove is the key driver to process the nutrient input spatially differently.
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Affiliation(s)
- Huaye Sun
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-Sen University, Guangzhou 510006, China
| | - Ziying He
- School of Marine Science, Sun Yat-Sen University, Zhuhai 519000, China
| | - Min Zhang
- Guangdong Institute of Applied Biological Resources, Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangzhou 510260, China
| | - Lingwei Yen
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-Sen University, Guangzhou 510006, China
| | - Yingjie Cao
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-Sen University, Guangzhou 510006, China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Sun Yat-Sen University, Zhuhai 519000, China
| | - Zhan Hu
- School of Marine Science, Sun Yat-Sen University, Zhuhai 519000, China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Sun Yat-Sen University, Zhuhai 519000, China
| | - Yisheng Peng
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-Sen University, Guangzhou 510006, China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Sun Yat-Sen University, Zhuhai 519000, China.
| | - Shing Yip Lee
- Simon F S Li Marine Science Laboratory, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
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15
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Zhu M, Kong F, Li Y, Li M, Zhang J, Xi M. Effects of moisture and salinity on soil dissolved organic matter and ecological risk of coastal wetland. ENVIRONMENTAL RESEARCH 2020; 187:109659. [PMID: 32447089 DOI: 10.1016/j.envres.2020.109659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
Coastal wetland is the transitional area between land and ocean, which has a unique and sensitive ecosystem. In this study, the effects of moisture and salinity on dissolved organic matter (DOM) and adsorption of heavy metal ions (Cr(VI), Cd(II) and Pb(II)) by soil are investigated. Meanwhile, ecological risks for the potential release of N, P and heavy metals are also predicted. UV-Vis spectrophotometry and three-dimensional fluorescence spectroscopy are used to study the content and structural of DOM under different soil moisture and salinity. Soil adsorption of heavy metal ions is determined by inductively coupled plasma (ICP). The results show that soil moisture and salinity have significant effects on the basic physical and chemical properties of soil. DOM content is the highest in medium moisture and high salinity areas. In addition, the content of protein-like substances in DOM is the highest under all treatment conditions. The results also reveal that the increase of DOM promotes Cr(VI) adsorption and inhibits Cd(II) adsorption by soil. When Pb(II) concentration is high (150 mg/L), the increase of DOM inhibits Pb(II) adsorption by soil. The comprehensive ecological risk of heavy metals is the highest under high salinity. The potential release risk of N and P is the lowest at high moisture and low moisture, respectively. Base on above, effects of soil moisture and salinity on the surrounding ecological environment in coastal wetlands have been revealed, which provides a theoretical basis for the protection of coastal wetland ecological environment.
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Affiliation(s)
- Meike Zhu
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China
| | - Fanlong Kong
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China
| | - Yue Li
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China
| | - Maomao Li
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China
| | - Junlong Zhang
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China.
| | - Min Xi
- College of Environmental Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China.
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