DOI: 10.1111/geb.13028
论文题名: Grazing intensity significantly changes the C : N : P stoichiometry in grassland ecosystems
作者: He M. ; Zhou G. ; Yuan T. ; van Groenigen K.J. ; Shao J. ; Zhou X.
刊名: Global Ecology and Biogeography
ISSN: 1466822X
出版年: 2020
卷: 29, 期: 2 语种: 英语
英文关键词: carbon sequestration
; ecosystem functioning
; grasslands
; grazing intensity
; meta-analysis
; stoichiometry
Scopus关键词: biogeochemical cycle
; carbon sequestration
; ecosystem function
; grassland
; grazing
; meta-analysis
; nitrogen
; phosphorus cycle
; soil nitrogen
; stoichiometry
英文摘要: Aim: Livestock grazing can alter carbon (C), nitrogen (N) and phosphorus (P) cycles, thereby affecting the C : N : P stoichiometry in grasslands. In this study, we aimed to examine mechanisms underlying the impacts of grazing on grassland C : N : P stoichiometry, focusing on belowground processes and their linkages with aboveground vegetation properties. Location: Global. Time period: 1900–2018. Major taxa studied: Grassland ecosystems. Methods: We conducted a meta-analysis based on 129 published studies to synthesize the effects of grazing on the C : N : P stoichiometry of leaves, stems, litter, roots, microbial biomass, and soil in grassland ecosystems. Results: Grazing significantly affected the C, N and P pools, and then the C : N : P stoichiometry in grassland ecosystems. Grazing effects on C : N : P stoichiometry varied strongly with grazing intensity. Specifically, heavy grazing decreased all C : N : P stoichiometry except litter N : P and root C : N ratios, while light and moderate grazing caused less negative or positive effects. Grazing effects on litter C : N ratio were negatively correlated with grazing effects on soil C : N ratios under light and moderate grazing, but this relationship was positive under heavy grazing. In contrast, grazing effects on root C : P and soil C : P were positively correlated under light and moderate grazing but negatively correlated under heavy grazing. Importantly, grazing significantly decreased the soil N pool by 10.0% but increased the soil P pool by 3.6%, indicating differential mechanisms for grazing impact on N and P cycles in grasslands. Main conclusions: Our results strongly suggest that grazing intensity regulates the biogeochemical cycles of C, N and P in grassland ecosystems by affecting plant nutrient use efficiency and soil physicochemical processes. Therefore, incorporating grazing intensity into Earth system models may improve predictions of climate–grassland feedbacks in the Anthropocene. © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159722
Appears in Collections: 气候变化与战略
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作者单位: Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China; Center for Global Change and Ecological Forecasting, East China Normal University, Shanghai, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China; Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom
Recommended Citation:
He M.,Zhou G.,Yuan T.,et al. Grazing intensity significantly changes the C : N : P stoichiometry in grassland ecosystems[J]. Global Ecology and Biogeography,2020-01-01,29(2)