globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13431
论文题名:
Grazing intensity significantly affects belowground carbon and nitrogen cycling in grassland ecosystems: a meta-analysis
作者: Zhou G.; Zhou X.; He Y.; Shao J.; Hu Z.; Liu R.; Zhou H.; Hosseinibai S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:3
起始页码: 1167
结束页码: 1179
语种: 英语
英文关键词: carbon sequestration ; CO2 emission ; heavy grazing ; mineralization ; soil microbial biomass
英文摘要: Livestock grazing activities potentially alter ecosystem carbon (C) and nitrogen (N) cycles in grassland ecosystems. Despite the fact that numerous individual studies and a few meta-analyses had been conducted, how grazing, especially its intensity, affects belowground C and N cycling in grasslands remains unclear. In this study, we performed a comprehensive meta-analysis of 115 published studies to examine the responses of 19 variables associated with belowground C and N cycling to livestock grazing in global grasslands. Our results showed that, on average, grazing significantly decreased belowground C and N pools in grassland ecosystems, with the largest decreases in microbial biomass C and N (21.62% and 24.40%, respectively). In contrast, belowground fluxes, including soil respiration, soil net N mineralization and soil N nitrification increased by 4.25%, 34.67% and 25.87%, respectively, in grazed grasslands compared to ungrazed ones. More importantly, grazing intensity significantly affected the magnitude (even direction) of changes in the majority of the assessed belowground C and N pools and fluxes, and C : N ratio as well as soil moisture. Specifically,light grazing contributed to soil C and N sequestration whereas moderate and heavy grazing significantly increased C and N losses. In addition, soil depth, livestock type and climatic conditions influenced the responses of selected variables to livestock grazing to some degree. Our findings highlight the importance of the effects of grazing intensity on belowground C and N cycling, which may need to be incorporated into regional and global models for predicting effects of human disturbance on global grasslands and assessing the climate-biosphere feedbacks. © 2016 John Wiley & Sons Ltd
资助项目: The authors thank two anonymous reviewers for their insightful comments and suggestions. This research was financially supported by the National Natural Science Foundation of China (Grant No. 31370489), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and ‘Thousand Young Talents’ Program in China. We would like to acknowledge the work carried out by the researchers whose published data were used for this meta-analysis.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61040
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China; Institute of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu, China; Center for Global Change and Ecological Forecasting, East China Normal University, Shanghai, China; Coastal Ecosystems Research Station of Yangtze River Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, 220 Handan Road, Shanghai, China; Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Maroochydore, DC, QLD, Australia

Recommended Citation:
Zhou G.,Zhou X.,He Y.,et al. Grazing intensity significantly affects belowground carbon and nitrogen cycling in grassland ecosystems: a meta-analysis[J]. Global Change Biology,2017-01-01,23(3)
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