文献类型：期刊文献

英文题名：Grazing significantly increases root shoot ratio but decreases soil organic carbon in Qinghai-Tibetan Plateau grasslands: A hierarchical meta-analysis

作者：Yan, Liang[1,2,3] Li, Yong[1,2,3] Wang, Li[4] Zhang, Xiaodong[1,2,3] Wang, Jinzhi[1,2,3] Wu, Haidong[1,2,3] Yan, Zhongqing[1,2,3] Zhang, Kerou[1,2,3] Kang, Xiaoming[1,2,3]

第一作者：Yan, Liang;颜亮

通信作者：Kang, XM[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China;[2]Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China;[3]Tibetan Autonomous Prefecture Aba, Sichuan Zoige Wetland Ecosyst Res Stn, Aba, Sichuan, Peoples R China;[4]Univ Calif Davis, Davis, CA 95616 USA

年份：2020

卷号：31

期号：16

起止页码：2369-2378

外文期刊名：LAND DEGRADATION & DEVELOPMENT

收录：;EI(收录号：20201808590381);Scopus(收录号：2-s2.0-85083834396);WOS:【SCI-EXPANDED(收录号:WOS:000526138600001)】；

基金：National Nonprofit Institute Research, Grant/Award Number: CAFYBB2017QB009; National Key Research and Development Program of China, Grant/Award Number: 2016YFC0501804

语种：英文

外文关键词：alpine grasslands; grazing effects; plant production; SOC and nitrogen; sustainable development

摘要：The Qinghai-Tibetan Plateau (QTP) is the most expansive area of alpine grasslands worldwide, which have been grazed for thousands of years. Distinct environmental conditions render QTP grasslands vulnerable to disturbances. Intensified grazing in the area has led to its degradation in recent decades. However, the effects of grazing on grassland production, soil carbon, and nitrogen contents, their relationships and the factors influencing the grasslands of QTP have yet to be determined. In this study, we evaluated the effect of grazing by using a hierarchical meta-analysis, and explored relation of response variables by structural equation modeling. In all, grazing significantly decreased the aboveground biomass (-38%), total biomass (TB) (-14%), litter (-63%), soil organic carbon (SOC) (-20%), and total nitrogen (TN) (-15%). The root shoot ratio was increased (75%). Grazing intensity exerted significant effects, and mean annual temperature and altitude influenced the responses to a certain degree. Specifically, the response of the root shoot ratio, which can affect the responses of SOC and TN, was significantly higher in the QTP grasslands. Our findings elucidated the response patterns, specialties, relationships, and factors influencing the QTP grasslands, which need to be considered in the development of process-based models and the sustainable use of alpine grasslands on QTP in the future.