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Takeda S, Makita N, Takahashi K. Seasonal and diurnal variations in soil respiration rates at a treeline ecotone and a lower distribution limit of subalpine forests. JOURNAL OF PLANT RESEARCH 2024; 137:179-190. [PMID: 38244125 DOI: 10.1007/s10265-023-01516-x] [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: 07/09/2023] [Accepted: 12/03/2023] [Indexed: 01/22/2024]
Abstract
This study examined the seasonal and diurnal variations in soil respiration rates (RS) during a growing season at the treeline ecotone (2,800 m) and the lower distribution limit (1,600 m) of subalpine forests on a volcanic mountain in Japan. The aboveground biomass, the total RS during the growing season, and the RS per day during the growing season were lower at 2,800 m than those at 1,600 m. Seasonal RS variations positively correlated with those of soil and air temperatures at both elevations, and this tendency was more apparent at 1,600 m than 2,800 m. The mean volumetric soil water content (WS) during the growing season was much lower at 2,800 m than 1,600 m because of the scoria substrate at 2,800 m. The monthly mean diel cycle of RS was positively correlated with the soil temperature at each elevation every month, whereas that at 1,600 m was negatively correlated with that of the WS. The RS at 2,800 m decreased during the daytime especially in August, despite no changes in the WS. The decrease in RS after precipitation at 1,600 m was higher than that at 2,800 m. Seasonal and diurnal RS variations could be reproduced from soil and air temperatures, and WS. Estimating soil respiration rate from these variables will help understand the future carbon budget of forests due to global warming.
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Affiliation(s)
- Soichiro Takeda
- Graduate School of Science and Technology, Shinshu University, Asahi 3-1-1, Matsumoto, 390-8621, Japan
| | - Naoki Makita
- Faculty of Science, Shinshu University, Asahi 3-1-1, Matsumoto, 390-8621, Japan
- Institute of Mountain Science, Shinshu University, Asahi 3-1-1, Matsumoto, 390-8621, Japan
| | - Koichi Takahashi
- Faculty of Science, Shinshu University, Asahi 3-1-1, Matsumoto, 390-8621, Japan.
- Institute of Mountain Science, Shinshu University, Asahi 3-1-1, Matsumoto, 390-8621, Japan.
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Beugnon R, Le Guyader N, Milcu A, Lenoir J, Puissant J, Morin X, Hättenschwiler S. Microclimate modulation: An overlooked mechanism influencing the impact of plant diversity on ecosystem functioning. GLOBAL CHANGE BIOLOGY 2024; 30:e17214. [PMID: 38494864 DOI: 10.1111/gcb.17214] [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: 12/04/2023] [Revised: 02/16/2024] [Accepted: 02/18/2024] [Indexed: 03/19/2024]
Abstract
Changes in climate and biodiversity are widely recognized as primary global change drivers of ecosystem structure and functioning, also affecting ecosystem services provided to human populations. Increasing plant diversity not only enhances ecosystem functioning and stability but also mitigates climate change effects and buffers extreme weather conditions, yet the underlying mechanisms remain largely unclear. Recent studies have shown that plant diversity can mitigate climate change (e.g. reduce temperature fluctuations or drought through microclimatic effects) in different compartments of the focal ecosystem, which as such may contribute to the effect of plant diversity on ecosystem properties and functioning. However, these potential plant diversity-induced microclimate effects are not sufficiently understood. Here, we explored the consequences of climate modulation through microclimate modification by plant diversity for ecosystem functioning as a potential mechanism contributing to the widely documented biodiversity-ecosystem functioning (BEF) relationships, using a combination of theoretical and simulation approaches. We focused on a diverse set of response variables at various levels of integration ranging from ecosystem-level carbon exchange to soil enzyme activity, including population dynamics and the activity of specific organisms. Here, we demonstrated that a vegetation layer composed of many plant species has the potential to influence ecosystem functioning and stability through the modification of microclimatic conditions, thus mitigating the negative impacts of climate extremes on ecosystem functioning. Integrating microclimatic processes (e.g. temperature, humidity and light modulation) as a mechanism contributing to the BEF relationships is a promising avenue to improve our understanding of the effects of climate change on ecosystem functioning and to better predict future ecosystem structure, functioning and services. In addition, microclimate management and monitoring should be seen as a potential tool by practitioners to adapt ecosystems to climate change.
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Affiliation(s)
- Rémy Beugnon
- German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Leipzig Institute for Meteorology, Universität Leipzig, Leipzig, Germany
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - Nolwenn Le Guyader
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
- Master de Biologie, École Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, Université de Lyon, Lyon, France
| | - Alexandru Milcu
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
- Ecotron Européen de Montpellier, Univ Montpellier, CNRS, Montferrier sur Lez, France
| | - Jonathan Lenoir
- UMR CNRS 7058 "Ecologie et Dynamique des Systèmes Anthropisés" (EDYSAN), Université de Picardie Jules Verne, Amiens, France
| | - Jérémy Puissant
- Laboratoire d'Ecologie Alpine, Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LECA, Grenoble, France
| | - Xavier Morin
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
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Bonato Asato AE, Wirth C, Eisenhauer N, Hines J. On the phenology of soil organisms: Current knowledge and future steps. Ecol Evol 2023; 13:e10022. [PMID: 37113518 PMCID: PMC10126832 DOI: 10.1002/ece3.10022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/29/2023] [Accepted: 04/03/2023] [Indexed: 04/29/2023] Open
Abstract
Phenology is the study of timing of periodic activities in biological life cycles. It describes an inherent component of ecosystem dynamics, and shifts in biological activity have been increasingly recognized as an indicator of global change. Although phenology is mainly studied above the ground, major ecosystem processes, such as decomposition, mineralization, and nutrient cycling, are soil-dependent. Therefore, the phenology of soil organisms is a crucial, but understudied, aspect of terrestrial ecosystem functioning. We performed a systematic review of 96 studies, which reported 228 phenological observations, to evaluate the current knowledge of soil microbial and animal phenology. Despite the increasing number of soil phenology reports, most research is still concentrated in a few countries (centered in the Northern Hemisphere) and taxa (microbiota), with significant gaps in the most diverse regions of the globe (i.e., tropics) and important taxa (e.g., ants, termites, and earthworms). Moreover, biotic predictors (e.g., biodiversity and species interactions) have rarely been considered as possible drivers of soil organisms' phenology. We present recommendations for future soil phenology research based on an evaluation of the reported geographical, taxonomic, and methodologic trends that bias current soil phenology research. First, we highlight papers that depict good soil phenology practice, either regarding the research foci, methodological approaches, or results reporting. Then, we discuss the gaps, challenges, and opportunities for future research. Overall, we advocate that focusing both on highly diverse ecosystems and key soil organisms, while testing for the direct and indirect effects of biodiversity loss and climatic stressors, could increase our knowledge of soil functioning and enhance the accuracy of predictions depicting the effects of global change on terrestrial ecosystem functioning as a whole.
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Affiliation(s)
- Ana E Bonato Asato
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany
- Institute of Biology Leipzig University Leipzig Germany
| | - Christian Wirth
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany
- Institute of Biology Leipzig University Leipzig Germany
| | - Nico Eisenhauer
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany
- Institute of Biology Leipzig University Leipzig Germany
| | - Jes Hines
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig Leipzig Germany
- Institute of Biology Leipzig University Leipzig Germany
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Mutinda ES, Mkala EM, Ren J, Kimutai F, Waswa EN, Odago WO, Nanjala C, Gichua MK, Njire MM, Hu GW. A review on the traditional uses, phytochemistry, and pharmacology of the genus Veronicastrum (Plantaginaceae). JOURNAL OF ETHNOPHARMACOLOGY 2023; 300:115695. [PMID: 36108894 DOI: 10.1016/j.jep.2022.115695] [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: 05/31/2022] [Revised: 08/17/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Veronicastrum Heist. ex Fabr. (Plantaginaceae) is a multifunctional plant in China and other parts of the continent. It has traditionally been used in the treatment of ascites, edema, blood stasis, pain relief, chronic nephritis injury, fever, cough, headache, arthritis, dysentery, rheumatism, pleural effusion, liver damage, and other disorders. Although research has confirmed that the genus Veronicastrum contain many active compounds, no review of its traditional uses, phytochemistry or pharmacology has been conducted to date. AIM This review aims to systematically evaluate the traditional uses, phytochemistry, and pharmacology of the genus Veronicastrum, discuss its medicinal potential, modern scientific research, and the relationship between them, and put forward some suggestions to promote further development and utilization of Veronicastrum. MATERIALS AND METHODS The traditional uses, phytochemical and pharmacological data related to the genus Veronicastrum from 1955 to date was compiled by surveying the ethnomedicinal books and published papers, and searching the online databases including Google Scholar, China National Knowledge Infrastructure (CNKI), Science Direct, Web of Science and World Flora Online. RESULTS Species of the genus Veronicastrum are widely used in folkloric medicine and some of their uses have been confirmed in modern pharmacological activities. A total of 89 chemical constituents have been isolated from the genus Veronicastrum, including flavonoids, carbohydrates, iridoids, terpenoids, phytosterols, phenolic acids, and other constituents. Among the compounds isolated, iridoids, flavonoids, and terpenoids are responsible for the biological activities of this genus with significant pharmacological activities both in vitro and in vivo. The extracts and compounds isolated from this genus have been reported to contain a wide range of pharmacological activities such as immunosuppressive, antioxidant, anti-cancer, anti-inflammatory, gastro protective, and antimicrobial activity. CONCLUSION The genus Veronicastrum is not only a great herbal remedy, but also has numerous bioactive chemicals with potential for new drug discovery. In the literature, phytochemical investigations have been undertaken on five species. Detailed scientific research is still needed to fully understand this genus. Furthermore, its bioactive chemicals' structure-activity connection, in vivo activity, and mechanism of action ought to be investigated further.
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Affiliation(s)
- Elizabeth Syowai Mutinda
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Elijah Mbandi Mkala
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Jing Ren
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China; College of Life Sciences, Hunan Normal University, Changsha, 410081, China.
| | - Festus Kimutai
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China; School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW, 2522, Australia.
| | - Emmanuel Nyongesa Waswa
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Wyclif Ochieng Odago
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Consolata Nanjala
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Moses Kirega Gichua
- Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000-00200, Nairobi, Kenya.
| | - Moses Muguci Njire
- Jomo Kenyatta University of Agriculture and Technology, P.O. Box 62000-00200, Nairobi, Kenya.
| | - Guang-Wan Hu
- CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan, Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
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5
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Mutinda ES, Mkala EM, Ren J, Kimutai F, Waswa EN, Odago WO, Nanjala C, Gichua MK, Njire MM, Hu GW. A review on the traditional uses, phytochemistry, and pharmacology of the genus Veronicastrum (Plantaginaceae). JOURNAL OF ETHNOPHARMACOLOGY 2023; 300:115695. [DOI: https:/doi.org/10.1016/j.jep.2022.115695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2023]
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Babur E, Dindaroğlu T, Riaz M, Uslu OS. Seasonal Variations in Litter Layers' Characteristics Control Microbial Respiration and Microbial Carbon Utilization Under Mature Pine, Cedar, and Beech Forest Stands in the Eastern Mediterranean Karstic Ecosystems. MICROBIAL ECOLOGY 2022; 84:153-167. [PMID: 34432102 DOI: 10.1007/s00248-021-01842-4] [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: 03/27/2021] [Accepted: 08/09/2021] [Indexed: 05/25/2023]
Abstract
The forest floor is hotspot of several functions integral to the stability of forest ecosystems. However, seasonal variations in litter decomposition rate contribute to biochemical and structural heterogeneity in the forest floor carbon (C) and nutrient cycling. We investigated the influence of seasonal variations in litter layers' micro-climate (temperature and moisture content) and chemical characteristics such as pH, electrical conductivity (EC), total organic C (TOC), total nitrogen (TN), and C/N ratio on microbial respiration, biomass, and C use efficiency under mature (> 80 years stage age) pine, beech, and cedar forests in eastern Mediterranean Karstic ecosystems. In contrast to significantly higher microbial respiration in fall, winter, and spring under pine, beech, and cedar forests, the significantly lowest microbial biomass C (MBC) and microbial biomass N (MBN) were observed in winter under each forest. Microbial C use efficiency, measured as the metabolic quotient (qCO2 = CO2/MBC), varied strongly between forest stands and seasons but was generally higher in winter. The significant positive correlations between litter layer and microbial biomass C/N ratios, under beech and cedar forests, suggested strong CN stoichiometric coupling and microbial adaptation to substrate resource stoichiometry. qCO2 correlated significantly negatively with litter layers' temperature, positively with moisture content and EC. However, qCO2 had significant negative relationships with pH in pine and beech forests but significant positive under cedar forest. qCO2 showed significant positive relationships with C/N ratios under all forests but much stronger in beech and cedar forests suggesting higher C respired per unit MBC with an increase in C/N ratio. Despite variations between forest species, the highest MBC/TOC and MBN/TN ratios in fall indicated greater C and N incorporation into microbial biomass. Changes in MBC/MBN ratios under pine (9.62-10.6), beech (8.63-15.6), and cedar (7.32-16.2) forests indicated the shift in microbial communities as fungi have a higher C/N ratio than bacteria. Stepwise regression analysis further revealed that microbial respiration and biomass were controlled differently by litter layer characteristics in each forest. This study suggested that qCO2 independently or with other microbial indices can show litter layers' controls on organic matter turnover in Karst ecosystems and, taking into account the strong seasonal variations, can enhance the predictive potential of decomposition models.
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Affiliation(s)
- Emre Babur
- Soil and Ecology Department, Faculty of Forestry, Kahramanmaras Sutcu Imam University, Kahramanmaraş, Turkey
| | - Turgay Dindaroğlu
- Soil and Ecology Department, Faculty of Forestry, Kahramanmaras Sutcu Imam University, Kahramanmaraş, Turkey
| | - Muhammad Riaz
- Department of Environmental Sciences and Engineering, Government College University, Faisalabad, Pakistan.
| | - Omer Suha Uslu
- Department of Field Crops, Faculty of Agriculture, Kahramanmaraş Sütçü İmam University, Kahramanmaraş, Turkey
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Helfter C, Gondwe M, Murray-Hudson M, Makati A, Skiba U. From sink to source: high inter-annual variability in the carbon budget of a Southern African wetland. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2022; 380:20210148. [PMID: 34865526 PMCID: PMC8646142 DOI: 10.1098/rsta.2021.0148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
We report on three years of continuous monitoring of carbon dioxide (CO2) and methane (CH4) emissions in two contrasting wetland areas of the Okavango Delta, Botswana: a perennial swamp and a seasonal floodplain. The hydrographic zones of the Okavango Delta possess distinct attributes (e.g. vegetation zonation, hydrology) which dictate their respective greenhouse gas (GHG) temporal emission patterns and magnitude. The perennial swamp was a net source of carbon (expressed in CO2-eq units), while the seasonal swamp was a sink in 2018. Despite differences in vegetation types and lifecycles, the net CO2 uptake was comparable at the two sites studied in 2018/2020 (-894.2 ± 127.4 g m-2 yr-1 at the perennial swamp, average of the 2018 and 2020 budgets, and -1024.5 ± 134.7 g m-2 yr-1 at the seasonal floodplain). The annual budgets of CH4 were however a factor of three larger at the permanent swamp in 2018 compared to the seasonal floodplain. Both ecosystems were sensitive to drought, which switched these sinks of atmospheric CO2 into sources in 2019. This phenomenon was particularly strong at the seasonal floodplain (net annual loss of CO2 of 1572.4 ± 158.1 g m-2), due to a sharp decrease in gross primary productivity. Similarly, drought caused CH4 emissions at the seasonal floodplain to decrease by a factor of 4 in 2019 compared to the previous year, but emissions from the perennial swamp were unaffected. Our study demonstrates that complex and divergent processes can coexist within the same landscape, and that meteorological anomalies can significantly perturb the balance of the individual terms of the GHG budget. Seasonal floodplains are particularly sensitive to drought, which exacerbate carbon losses to the atmosphere, and it is crucial to improve our understanding of the role played by such wetlands in order to better forecast how their emissions might evolve in a changing climate. Studying such hydro-ecosystems, particularly in the data-poor tropics, and how natural stressors such as drought affect them, can also inform on the potential impacts of man-made perturbations (e.g. construction of hydro-electric dams) and how these might be mitigated. Given the contrasting effects of drought on the CO2 and CH4 flux terms, it is crucial to evaluate an ecosystem's complete carbon budget instead of treating these GHGs in isolation. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part 2)'.
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Affiliation(s)
- Carole Helfter
- UK Centre for Ecology and Hydrology, Atmospheric Chemistry and Effects, Penicuik EH26 0QB, UK
| | - Mangaliso Gondwe
- Okavango Research Institute, University of Botswana, Maun, Botswana
| | | | - Anastacia Makati
- Okavango Research Institute, University of Botswana, Maun, Botswana
| | - Ute Skiba
- UK Centre for Ecology and Hydrology, Atmospheric Chemistry and Effects, Penicuik EH26 0QB, UK
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Sun X, Zheng Y, Xu G, Guo Q, Tan J, Ding G. Fungal diversity within the phyllosphere of Pinus massoniana and the possible involvement of phyllospheric fungi in litter decomposition. Fungal Biol 2021; 125:785-795. [PMID: 34537174 DOI: 10.1016/j.funbio.2021.05.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 04/29/2021] [Accepted: 05/06/2021] [Indexed: 10/21/2022]
Abstract
Fungi play key roles in forest ecosystems and help to shape the forest's diverse functions. However, little is known about the diversity of phyllospheric fungi or their possible relationships with fungal communities residing in different micro-environments of Pinus massoniana forests. We investigated seven different sample types: mature needles (NM), dead needles (ND), needles falling as litter (L), fermenting needles (F), humus (H), top soil (0-20 cm) (TS), and secondary soil (20-40 cm) (SS). These seven fungal communities were examined and compared with ITS amplicons using a high-throughput sequencing technique. A total of 1213 fungal operational taxonomic units (OTUs) were obtained at a 97% sequence similarity level. Distinct fungal communities were associated with different sample types. A greater number of OTUs were present in both NM and F samples than those shared by both NM and TS samples, indicating that phyllospheric fungi may play crucial roles in litter decomposition. Sixty OTUs (the core microbiome) were found in all sample types, and they may probably play different ecological roles in different sample types. These findings extend our knowledge of the fungal diversity of the phyllosphere and its possible interactions with fungal communities found in distinct forest micro-habitats.
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Affiliation(s)
- Xueguang Sun
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, 550025, China; Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province, Guizhou University, Guiyang, Guizhou, 550025, China; College of Forestry, Guizhou University, Guiyang, 550025, China.
| | - Yang Zheng
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, 550025, China; Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province, Guizhou University, Guiyang, Guizhou, 550025, China; College of Forestry, Guizhou University, Guiyang, 550025, China
| | - Gang Xu
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, 550025, China; Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province, Guizhou University, Guiyang, Guizhou, 550025, China; College of Forestry, Guizhou University, Guiyang, 550025, China
| | - Qiqiang Guo
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, 550025, China; Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province, Guizhou University, Guiyang, Guizhou, 550025, China; College of Forestry, Guizhou University, Guiyang, 550025, China
| | - Jianhui Tan
- Guangxi Zhuang Autonomous Region Forestry Research Institute, Nanning, Guangxi, 530002, China
| | - Guijie Ding
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, 550025, China; Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province, Guizhou University, Guiyang, Guizhou, 550025, China; College of Forestry, Guizhou University, Guiyang, 550025, China
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9
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Badraghi A, Ventura M, Polo A, Borruso L, Giammarchi F, Montagnani L. Soil respiration variation along an altitudinal gradient in the Italian Alps: Disentangling forest structure and temperature effects. PLoS One 2021; 16:e0247893. [PMID: 34403412 PMCID: PMC8370607 DOI: 10.1371/journal.pone.0247893] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 07/22/2021] [Indexed: 11/19/2022] Open
Abstract
On the mountains, along an elevation gradient, we generally observe an ample variation in temperature, with the associated difference in vegetation structure and composition and soil properties. With the aim of quantifying the relative importance of temperature, vegetation and edaphic properties on soil respiration (SR), we investigated changes in SR along an elevation gradient (404 to 2101 m a.s.l) in the southern slopes of the Alps in Northern Italy. We also analysed soil physicochemical properties, including soil organic carbon (SOC) and nitrogen (N) stocks, fine root C and N, litter C and N, soil bulk densities and soil pH at five forest sites, and also stand structural properties, including vegetation height, age and basal area. Our results indicated that SR rates increased with temperature in all sites, and 55–76% of SR variability was explained by temperature. Annual cumulative SR, ranging between 0.65–1.40 kg C m-2 yr-1, decreased along the elevation gradient, while temperature sensitivity (Q10) of SR increased with elevation. However, a high SR rate (1.27 kg C m-2 yr-1) and low Q10 were recorded in the mature conifer forest stand at 1731 m a.s.l., characterized by an uneven-aged structure and high dominant tree height, resulting in a nonlinear relationship between elevation and temperature. Reference SR at 10°C (SRref) was unrelated to elevation, but was related to tree height. A significant negative linear relationship was found between bulk density and elevation. Conversely, SOC, root C and N stock, pH, and litter mass were best fitted by nonlinear relationships with elevation. However, these parameters were not significantly correlated with SR when the effect of temperature was removed (SRref). These results demonstrate that the main factor affecting SR in forest ecosystems along this Alpine elevation gradient is temperature, but its regulating role can be strongly influenced by site biological characteristics, particularly vegetation type and structure, affecting litter quality and microclimate. This study also confirms that high elevation sites are rich in SOC and more sensitive to climate change, being prone to high C losses as CO2. Furthermore, our data indicate a positive relationship between Q10 and dominant tree height, suggesting that mature forest ecosystems characterized by an uneven-age structure, high SRref and moderate Q10, may be more resilient.
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Affiliation(s)
- Aysan Badraghi
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Maurizio Ventura
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Andrea Polo
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Luigimaria Borruso
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Francesco Giammarchi
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Leonardo Montagnani
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bolzano, Italy
- Forest Services, Autonomous Province of Bolzano, Bolzano, Italy
- * E-mail:
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10
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Wang T, Xu Q, Gao D, Zhang B, Zuo H, Jiang J. Effects of thinning and understory removal on the soil water-holding capacity in Pinus massoniana plantations. Sci Rep 2021; 11:13029. [PMID: 34158581 PMCID: PMC8219692 DOI: 10.1038/s41598-021-92423-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 06/07/2021] [Indexed: 11/10/2022] Open
Abstract
Forest management practices play an important role in regulating the soil water-holding capacity of plantation. However, most studies focus on soil water dynamics present during large-scale forest loss and afforestation events, while little is known about how soil water under different forest management practices responds to rainfall events and which factors mainly regulate soil water-holding capacity. In this study, a stable hydrogen isotope was used to explore the contribution of three natural rainfall events (8.9, 13.3 and 67.7 mm) to soil water (CRSW) in a Pinus massoniana plantation under four forest management practices (no thinning (NTN), understory removal (USR), light-intensity thinning (LIT) and heavy-intensity thinning (HIT)) in the Three Gorges Reservoir Area of the Yangtze River Basin in China. Furthermore, a structural equation model was employed to determine the effects of vegetation biomass and soil properties on the CRSW. The results showed that plantation soil under different forest management practices exhibited different water-holding capacities. Following light (8.9 mm) and moderate (13.3 mm) rainfall events, the CRSW in the HIT stand was slightly higher than that in the other stands. Following heavy (66.7 mm) rainfall event, the CRSW of most layers in USR stand was not different from the other three stands, while the CRSW in the LIT and NTN stands was significantly higher than that in the HIT stand in the 0–100 cm soil layers, suggesting that soil in the LIT and NTN stands had a greater water-holding capacity than that in the HIT stand. In addition, soil properties were the main factors directly affecting the CRSW, explaining 60% and 37% of the variation in the CRSW on the first and seventh days after heavy rainfall, respectively. Overall, compared to the HIT stand, the LIT and NTN stands showed greater capacity in retaining rainwater. Therefore, under expected global changes with frequent occurrences of extreme precipitation events, methods involving light-intensity and no thinning should be employed to build up soil and water conservation functions, which will be critical for keeping water-holding capacity and moderating floods.
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Affiliation(s)
- Ting Wang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Qing Xu
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.
| | - Deqiang Gao
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China.
| | - Beibei Zhang
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Haijun Zuo
- Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China
| | - Jing Jiang
- University of Calgary, Calgary, T2N1N4, Canada
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11
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Hu A, Duan Y, Xu L, Chang S, Chen X, Hou F. Litter decomposes slowly on shaded steep slope and sunny gentle slope in a typical steppe ecoregion. Ecol Evol 2021; 11:2461-2470. [PMID: 33767814 PMCID: PMC7981220 DOI: 10.1002/ece3.6933] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 09/11/2020] [Accepted: 09/28/2020] [Indexed: 11/09/2022] Open
Abstract
Plant litter decomposition is mainly affected by litter properties and environmental factors, but the influence of terrain on litter decomposition is not well understood. We studied the effects of terrain on litter decomposition over a period of 12 months at six locations in a typical steppe ecoregion and measured the concomitant release of carbon (C), nitrogen (N), and phosphorus (P). The study site has two aspects, shaded and sunny, each aspect having three slopes: 15°, 30°, and 45°. The same mixed litter was used at each location to exclude the influence of litter quality variation. Results showed that soil temperature and moisture, solar radiation, and plant species diversity varied by terrain, which in turn, affected the k-value (standardized total effects, 0.78, 0.12, 0.92, 0.23, respectively) and the release of C (0.72, -0.25, 0.83, 0.24, respectively), N (0.89, -0.45, 0.76, 0.40, respectively) and P (0.88, 0.77, 0.58, 0.57, respectively). K-value and C release decreased with increasing slope on shaded aspect, while increased with increasing slope on sunny aspect. The release of N and P decreased with increasing slope on the shaded aspect. K-value and C, N, and P release were significantly higher on shaded than that on sunny aspect at 15° and 30°, while at 45°, it was higher on sunny than on shaded aspect. The litter mass loss was slower on shaded 45° and sunny 15°. So moderate grazing or mowing could be used to reduce litter accumulation and accelerate litter decomposition on these terrains. Structural equation modeling indicated that soil temperature and solar radiation had the greatest influence on k-value and C, N, and P release, and these two factors were directly related to soil moisture and plant species diversity. Overall, our results emphasize the need to consider terrain for litter decomposition in typical steppe ecoregions.
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Affiliation(s)
- An Hu
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
| | - Yaning Duan
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
| | - Lei Xu
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
| | - Shenghua Chang
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
| | - Xianjiang Chen
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
| | - Fujiang Hou
- State Key Laboratory of Grassland Agro‐EcosystemsKey Laboratory of Grassland Livestock Industry InnovationMinistry of AgricultureLanzhouChina
- College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina
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12
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Increased Litter Greatly Enhancing Soil Respiration in Betula platyphylla Forests of Permafrost Region, Northeast China. FORESTS 2021. [DOI: 10.3390/f12010089] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The change of litter input can affect soil respiration (Rs) by influencing the availability of soil organic carbon and nutrients, regulating soil microenvironments, thus resulting in a profound influence on soil carbon cycle of the forest ecosystem. We conducted an aboveground litterfall manipulation experiment in different-aged Betula platyphylla forests (25-, 40- and 61-year-old) of the permafrost region, located in the northeast of China, during May to October in 2018, with each stand treated with doubling litter (litter addition, DL), litter exclusion (no-litter, NL) and control litter (CK). Our results indicated that Rs decreased under NL treatment compared with CK treatment. The effect size lessened with the increase in the stand age; the greatest reduction was found for young Betula platyphylla forest (24.46% for 25-year-old stand) and tended to stabilize with the growth of forest with the reduction of 15.65% and 15.23% for 40-and 61- year-old stands, respectively. Meanwhile, under DL treatment, Rs increased by 27.38%, 23.83% and 23.58% on 25-, 40- and 61-year-old stands, respectively. Our results also showed that the increase caused by DL treatment was larger than the reduction caused by NL treatment, leading to a priming effect, especially on 40- and 61-year-old stands. The change in litter input was the principal factor affecting the change of Rs under litter manipulation. The soil temperature was also a main factor affecting the contribution rate of litter to Rs of different-aged stands, which had a significant positive exponential correlation with Rs. This suggests that there is a significant relationship between litter and Rs, which consequently influences the soil carbon cycle in Betula platyphylla forests of the permafrost region, Northeast China. Our finding indicated the increased litter enhanced the Rs in Betula platyphylla forest, which may consequently increase the carbon emission in a warming climate in the future. It is of great importance for future forest management in the permafrost region, Northeast China.
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Marañón-Jiménez S, Radujković D, Verbruggen E, Grau O, Cuntz M, Peñuelas J, Richter A, Schrumpf M, Rebmann C. Shifts in the Abundances of Saprotrophic and Ectomycorrhizal Fungi With Altered Leaf Litter Inputs. FRONTIERS IN PLANT SCIENCE 2021; 12:682142. [PMID: 34367207 PMCID: PMC8336600 DOI: 10.3389/fpls.2021.682142] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 06/22/2021] [Indexed: 05/15/2023]
Abstract
Ectomycorrhizal (EcM) and saprotrophic fungi interact in the breakdown of organic matter, but the mechanisms underlying the EcM role on organic matter decomposition are not totally clear. We hypothesized that the ecological relations between EcM and saprotroph fungi are modulated by resources availability and accessibility, determining decomposition rates. We manipulated the amount of leaf litter inputs (No-Litter, Control Litter, Doubled Litter) on Trenched (root exclusion) and Non-Trenched plots (with roots) in a temperate deciduous forest of EcM-associated trees. Resultant shifts in soil fungal communities were determined by phospholipid fatty acids and DNA sequencing after 3 years, and CO2 fluxes were measured throughout this period. Different levels of leaf litter inputs generated a gradient of organic substrate availability and accessibility, altering the composition and ecological relations between EcM and saprotroph fungal communities. EcM fungi dominated at low levels of fresh organic substrates and lower organic matter quality, where short-distances exploration types seem to be better competitors, whereas saprotrophs and longer exploration types of EcM fungi tended to dominate at high levels of leaf litter inputs, where labile organic substrates were easily accessible. We were, however, not able to detect unequivocal signs of competition between these fungal groups for common resources. These results point to the relevance of substrate quality and availability as key factors determining the role of EcM and saprotroph fungi on litter and soil organic matter decay and represent a path forward on the capacity of organic matter decomposition of different exploration types of EcM fungi.
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Affiliation(s)
- Sara Marañón-Jiménez
- Center for Ecological Research and Forestry Applications (CREAF), Bellaterra, Spain
- Spanish National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Spain
- *Correspondence: Sara Marañón-Jiménez
| | - Dajana Radujković
- Centre of Excellence Plant and Ecosystems (PLECO), Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Erik Verbruggen
- Centre of Excellence Plant and Ecosystems (PLECO), Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Oriol Grau
- Center for Ecological Research and Forestry Applications (CREAF), Bellaterra, Spain
- Spanish National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Spain
- French Agricultural Research Centre for International Development (CIRAD), Joint Research Unit Ecology of Guianan Forests-UMR EcoFoG (AgroParisTech, CNRS, INRA, University of Antilles, University of Guyane), Kourou, French Guiana
| | - Matthias Cuntz
- Université de Lorraine, French National Institute of Agricultural Research, AgroParisTech, UMR 1434 Silva, Nancy, France
| | - Josep Peñuelas
- Center for Ecological Research and Forestry Applications (CREAF), Bellaterra, Spain
- Spanish National Research Council (CSIC), Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Spain
| | - Andreas Richter
- Department of Microbiology and Ecosystem Science, University of Vienna, Wien, Austria
| | - Marion Schrumpf
- Department for Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany
| | - Corinna Rebmann
- UFZ—Helmholtz Centre for Environmental Research, Department of Computational Hydrosystems, Leipzig, Germany
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14
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Zhang Y, Zou J, Meng D, Dang S, Zhou J, Osborne B, Ren Y, Liang T, Yu K. Effect of soil microorganisms and labile C availability on soil respiration in response to litter inputs in forest ecosystems: A meta-analysis. Ecol Evol 2020; 10:13602-13612. [PMID: 33391666 PMCID: PMC7771185 DOI: 10.1002/ece3.6965] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 09/29/2020] [Indexed: 01/25/2023] Open
Abstract
Litter inputs can influence soil respiration directly through labile C availability and, indirectly, through the activity of soil microorganisms and modifications in soil microclimate; however, their relative contributions and the magnitude of any effect remain poorly understood. We synthesized 66 recently published papers on forest ecosystems using a meta-analysis approach to investigate the effect of litter inputs on soil respiration and the underlying mechanisms involved. Our results showed that litter inputs had a strong positive impact on soil respiration, labile C availability, and the abundance of soil microorganisms, with less of an impact related to soil moisture and temperature. Overall, soil respiration was increased by 36% and 55%, respectively, in response to natural and doubled litter inputs. The increase in soil respiration induced by litter inputs showed a tendency for coniferous forests (50.7%)> broad-leaved forests (41.3%)> mixed forests (31.9%). This stimulation effect also depended on stand age with 30- to 100-year-old forests (53.3%) and ≥100-year-old forests (50.2%) both 1.5 times larger than ≤30-year-old forests (34.5%). Soil microbial biomass carbon and soil dissolved organic carbon increased by 21.0%-33.6% and 60.3%-87.7%, respectively, in response to natural and doubled litter inputs, while soil respiration increased linearly with corresponding increases in soil microbial biomass carbon and soil dissolved organic carbon. Natural and doubled litter inputs increased the total phospholipid fatty acid (PLFA) content by 6.6% and 19.7%, respectively, but decreased the fungal/bacterial PLFA ratio by 26.9% and 18.7%, respectively. Soil respiration also increased linearly with increases in total PLFA and decreased linearly with decreases in the fungal/bacterial PLFA ratio. The contribution of litter inputs to an increase in soil respiration showed a trend of total PLFA > fungal/bacterial PLFA ratio > soil dissolved organic carbon > soil microbial biomass carbon. Therefore, in addition to forest type and stand age, labile C availability and soil microorganisms are also important factors that influence soil respiration in response to litter inputs, with soil microorganisms being more important than labile C availability.
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Affiliation(s)
- Yanjun Zhang
- Geography and Environmental Engineering DepartmentBaoji University of Arts and SciencesBaojiChina
| | - Junliang Zou
- Beijing Research & Development Centre for Grass and EnvironmentBeijing Academy of Agriculture and Forestry SciencesBeijingChina
| | - Delong Meng
- Key Laboratory of BiometallurgyMinistry of EducationSchool of Minerals Processing and BioengineeringCentral South UniversityChangshaChina
| | - Shuina Dang
- School of EducationBaoji University of Arts and SciencesBaojiChina
| | - Jinhong Zhou
- Geography and Environmental Engineering DepartmentBaoji University of Arts and SciencesBaojiChina
| | - Bruce Osborne
- UCD School of Biology and Environmental Science and UCD Earth InstituteUniversity College DublinBelfield, Dublin 4Ireland
| | - Yuanyuan Ren
- Geography and Environmental Engineering DepartmentBaoji University of Arts and SciencesBaojiChina
| | - Ting Liang
- Geography and Environmental Engineering DepartmentBaoji University of Arts and SciencesBaojiChina
| | - Keke Yu
- Geography and Environmental Engineering DepartmentBaoji University of Arts and SciencesBaojiChina
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15
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Tsafack N, Xie Y, Wang X, Fattorini S. Influence of Climate and Local Habitat Characteristics on Carabid Beetle Abundance and Diversity in Northern Chinese Steppes. INSECTS 2019; 11:E19. [PMID: 31878317 PMCID: PMC7023069 DOI: 10.3390/insects11010019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 12/18/2019] [Accepted: 12/20/2019] [Indexed: 11/17/2022]
Abstract
Carabids are an important insect group in grassland ecosystems and are involved in numerous ecosystem services. Steppes are the most widespread ecosystems in China, but they are under increasing degradation. Despite their importance, little is known about the relationships between environmental variables and carabid community structure in Chinese steppes. We studied the effects of fine-scale factors (soil and vegetation) and coarse-scale factors (climate) on carabid community parameters (abundance, richness, diversity, dominance, and evenness) in three types of steppes (desert, typical, and meadow steppes) in northern China. Carabid communities responded to environmental factors in different ways according to the type of steppe. Climate factors were the most important drivers of community structure, whereas the effects of soil and vegetation were less important. Desert steppe showed the lowest carabid abundance, richness, diversity, and evenness, and the highest dominance. This community is relatively simple and strongly dominated by a few species adapted to the severe conditions of this environment. Typical and meadow steppes showed carabid communities with a more complex structure. As expected on the basis of environmental severity, the most severe ecosystem (i.e., the desert) was only influenced by climatic factors, whereas a certain influence of biotic factors emerged in the other ecosystems.
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Affiliation(s)
- Noelline Tsafack
- School of Agriculture, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China;
| | - Yingzhong Xie
- School of Agriculture, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China;
| | - Xinpu Wang
- School of Agriculture, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China;
| | - Simone Fattorini
- Department of Life, Health, and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy;
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16
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Shu M, Zhao Q, Li Z, Zhang L, Wang P, Hu S. Effects of global change factors and living roots on root litter decomposition in a Qinghai-Tibet alpine meadow. Sci Rep 2019; 9:16924. [PMID: 31729455 PMCID: PMC6858338 DOI: 10.1038/s41598-019-53450-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 10/25/2019] [Indexed: 11/30/2022] Open
Abstract
Roots account for a major part of plant biomass in Tibetan alpine meadows. Understanding root decomposition with global change is key to predict carbon (C) and nutrient dynamics on the Qinghai-Tibet Plateau. Yet, few experiments have carefully examined root decomposition as influenced by global change. We conducted a field study to investigate the effects of nitrogen (N) addition, air warming, precipitation change, and the presence/absence of living roots on root decomposition in a Tibetan alpine meadow. Our results showed that N addition increased the mass and C remaining, and induced N accumulation in the litter. Increased precipitation significantly amplified the positive effect of N addition on litter mass remaining. The presence of alive roots in the litterbags decreased root litter C remaining but significantly increased N and phosphorus remaining of the litter. However, we did not find any significant effects of air warming on the litter decomposition. In the Qinghai-Tibet Plateau, N deposition is predicted to increase and precipitation regime is predicted to change. Our results suggest that the interaction between increased N and precipitation may reduce root decomposition in the Qinghai-Tibet Plateau in the future, and that the large stock of living roots exert a dominant impact on nutrient dynamics of root decomposition in the Tibetan alpine systems.
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Affiliation(s)
- Meng Shu
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
| | - Qingzhou Zhao
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
| | - Zhen Li
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
| | - Lin Zhang
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
| | - Peng Wang
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Shuijin Hu
- Colloge of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
- Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, 27695, USA
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17
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Yao X, Yu K, Wang G, Deng Y, Lai Z, Chen Y, Jiang Y, Liu J. Effects of soil erosion and reforestation on soil respiration, organic carbon and nitrogen stocks in an eroded area of Southern China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 683:98-108. [PMID: 31129335 DOI: 10.1016/j.scitotenv.2019.05.221] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/15/2019] [Accepted: 05/15/2019] [Indexed: 06/09/2023]
Abstract
Soil erosion and reforestation greatly affects the functionality of many terrestrial ecosystems. However, the effects of soil erosion and reforestation on soil respiration (SR), and soil organic carbon (SOC) and total nitrogen (TN) stocks remain unclear. Therefore, we investigated the changes in SR, and SOC and TN stocks at four different soil erosion levels (severely, moderately, lightly, and non-eroded) and two different aged Pinus massoniana plantations (8- and 36-year-old) in the hilly red soil regions of Southern China. Our results showed that soil erosion level and reforestation significantly influenced SR, and SOC and TN stocks. Meanwhile, the mean SR, and SOC and TN stocks all significantly decreased with erosion level but increased significantly with times since reforestation. Soil temperature (ST) could explain 70-92% of SR seasonal variation based on exponential models, whereas no significant relationship between SR and soil water content were found. Furthermore, the structural equation modeling indicated that SOC stocks at 0-20 cm had a much stronger effect on SR than ST. Meanwhile, the SOC stocks for 0-20 cm increased by 177% and 558% in the 8- and 36-year-old Pinus massoniana plantations in comparison with the severely eroded forestland, respectively. This study highlights that reforestation could be an effective strategy for restoring the carbon and nitrogen storage in eroded regions of Southern China and emphasizes the need to consider the effects of soil erosion and reforestation when assessing regional carbon budgets under different climate scenarios.
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Affiliation(s)
- Xiong Yao
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; University Key Lab for Geomatics Technology and Optimize Resources Utilization in Fujian Province, Fuzhou, Fujian 350002, China
| | - Kunyong Yu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; University Key Lab for Geomatics Technology and Optimize Resources Utilization in Fujian Province, Fuzhou, Fujian 350002, China
| | - Guangyu Wang
- Faculty of Forestry, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Yangbo Deng
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Zhuangjie Lai
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Yan Chen
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Yusen Jiang
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Jian Liu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; University Key Lab for Geomatics Technology and Optimize Resources Utilization in Fujian Province, Fuzhou, Fujian 350002, China.
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18
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Tsafack N, Rebaudo F, Wang H, Nagy DD, Xie Y, Wang X, Fattorini S. Carabid community structure in northern China grassland ecosystems: Effects of local habitat on species richness, species composition and functional diversity. PeerJ 2019; 6:e6197. [PMID: 30643684 PMCID: PMC6330033 DOI: 10.7717/peerj.6197] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 12/02/2018] [Indexed: 12/02/2022] Open
Abstract
Background Most carabid beetles are particularly sensitive to local habitat characteristics. Although in China grasslands account for more than 40% of the national land, their biodiversity is still poorly known. The aim of this paper is to identify the main environmental characteristics influencing carabid diversity in different types of grassland in northern China. Methods We investigated the influence of vegetation (plant biomass, cover, density, height and species richness), soil (bulk density, above ground litter, moisture and temperature) and climate (humidity, precipitation and temperature) on carabid community structure (species richness, species composition and functional diversity—measured as body size, movement and total diversity) in three types of grasslands: desert, typical and meadow steppes. We used Canonical correspondence analysis to investigate the role of habitat characteristics on species composition and eigenvector spatial filtering to investigate the responses of species richness and functional diversities. Results We found that carabid community structure was strongly influenced by local habitat characteristics and particularly by climatic factors. Carabids in the desert steppe showed the lowest richness and functional diversities. Climate predictors (temperature, precipitation and humidity) had positive effects on carabid species richness at both regional and ecosystem levels, with difference among ecosystems. Plant diversity had a positive influence on carabid richness at the regional level. Soil compaction and temperature were negatively related to species richness at regional level. Climatic factors positively influenced functional diversities, whereas soil temperature had negative effects. Soil moisture and temperature were the most important drivers of species composition at regional level, whereas the relative importance of the various environmental parameters varied among ecosystems. Discussion Carabid responses to environmental characteristics varied among grassland types, which warns against generalizations and indicates that management programs should be considered at grassland scale. Carabid community structure is strongly influenced by climatic factors, and can therefore be particularly sensitive to ongoing climate change.
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Affiliation(s)
| | - François Rebaudo
- UMR EGCE, IRD, University of Paris-Sud, CNRS, University of Paris-Saclay, Gif-sur-Yvette, France
| | - Hui Wang
- School of Agriculture, Ningxia University, Yinchuan, China
| | - Dávid D Nagy
- MTA-DE, Biodiversity and Ecosystem Services Research Group, Egyetem Sq. 1, Debrecen, Hungary
| | - Yingzhong Xie
- School of Agriculture, Ningxia University, Yinchuan, China
| | - Xinpu Wang
- School of Agriculture, Ningxia University, Yinchuan, China
| | - Simone Fattorini
- Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy
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19
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Single Session of Chiseling Tillage for Soil and Vegetation Restoration in Severely Degraded Shrublands. WATER 2018. [DOI: 10.3390/w10060755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Labile organic carbon pools and enzyme activities of Pinus massoniana plantation soil as affected by understory vegetation removal and thinning. Sci Rep 2018; 8:573. [PMID: 29330477 PMCID: PMC5766595 DOI: 10.1038/s41598-017-18812-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 12/16/2017] [Indexed: 12/01/2022] Open
Abstract
The effects of forest management on carbon (C) sequestration are poorly understood, particularly in the Three Gorges Reservoir area. We aimed to identify the effects of forest management on C sequestration in Pinus massoniana plantations. An intact control forest (CK), a site undergoing regular shrub cutting with the simultaneous removal of residues (SC), a site under low-intensity thinning (LIT), and a site under high-intensity thinning (HIT) were compared for soil labile organic carbon (LOC), related enzyme activities, and soil characteristics. Soil organic carbon (SOC) significantly decreased in the HIT treatment as compared with that in the CK treatment. Soil EOC, DOC, MBC contents in treated plots were higher than those in the CK treatment; particularly, the HIT treatment significantly increased those values in 0–10 cm layer. Thinning resulted in a decrease in cellulase and amylase activities, but an increase in invertase activity. In addition, the SOC content was significantly correlated with four enzymes activities and LOC components, which suggested that the soil LOC components and enzymes activities were sensitive to the changes of SOC. Our results suggest that high-intensity thinning treatment in Pinus massoniana plantation could significantly decrease the SOC content and lead to an increase of LOC components.
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Imposed drought effects on carbon storage of moso bamboo ecosystem in southeast China: results from a field experiment. Ecol Res 2017. [DOI: 10.1007/s11284-017-1529-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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The Impact of Water Content on Sources of Heterotrophic Soil Respiration. FORESTS 2017. [DOI: 10.3390/f8080299] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Smorkalov IA. A new field method for measuring forest litter respiration rate. RUSS J ECOL+ 2016. [DOI: 10.1134/s1067413616050106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hu J, Zhou J, Zhou G, Luo Y, Xu X, Li P, Liang J. Improving Estimations of Spatial Distribution of Soil Respiration Using the Bayesian Maximum Entropy Algorithm and Soil Temperature as Auxiliary Data. PLoS One 2016; 11:e0146589. [PMID: 26807579 PMCID: PMC4726581 DOI: 10.1371/journal.pone.0146589] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 12/18/2015] [Indexed: 11/26/2022] Open
Abstract
Soil respiration inherently shows strong spatial variability. It is difficult to obtain an accurate characterization of soil respiration with an insufficient number of monitoring points. However, it is expensive and cumbersome to deploy many sensors. To solve this problem, we proposed employing the Bayesian Maximum Entropy (BME) algorithm, using soil temperature as auxiliary information, to study the spatial distribution of soil respiration. The BME algorithm used the soft data (auxiliary information) effectively to improve the estimation accuracy of the spatiotemporal distribution of soil respiration. Based on the functional relationship between soil temperature and soil respiration, the BME algorithm satisfactorily integrated soil temperature data into said spatial distribution. As a means of comparison, we also applied the Ordinary Kriging (OK) and Co-Kriging (Co-OK) methods. The results indicated that the root mean squared errors (RMSEs) and absolute values of bias for both Day 1 and Day 2 were the lowest for the BME method, thus demonstrating its higher estimation accuracy. Further, we compared the performance of the BME algorithm coupled with auxiliary information, namely soil temperature data, and the OK method without auxiliary information in the same study area for 9, 21, and 37 sampled points. The results showed that the RMSEs for the BME algorithm (0.972 and 1.193) were less than those for the OK method (1.146 and 1.539) when the number of sampled points was 9 and 37, respectively. This indicates that the former method using auxiliary information could reduce the required number of sampling points for studying spatial distribution of soil respiration. Thus, the BME algorithm, coupled with soil temperature data, can not only improve the accuracy of soil respiration spatial interpolation but can also reduce the number of sampling points.
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Affiliation(s)
- Junguo Hu
- Information Engineering College of Zhejiang A & F University, Linan, PR China
- Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Research, Linan, PR China
| | - Jian Zhou
- Information Engineering College of Zhejiang A & F University, Linan, PR China
| | - Guomo Zhou
- Information Engineering College of Zhejiang A & F University, Linan, PR China
- * E-mail:
| | - Yiqi Luo
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma, United States of America
| | - Xiaojun Xu
- Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Research, Linan, PR China
| | - Pingheng Li
- Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Research, Linan, PR China
| | - Junyi Liang
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma, United States of America
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