Monitoring the impact of climate change and human activities on grassland vegetation dynamics in the northeastern Qinghai-Tibet Plateau of China during 2000–2015

作     者：XIONG Qinli XIAO Yang Marwa Waseem A HALMY Mohammed A DAKHIL LIANG Pinghan LIU Chenggang ZHANG Lin Bikram PANDEY PAN Kaiwen Sameh B EL KAFRAWAY CHEN Jun 

作者机构：CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China College of Biology and Environmental SciencesJishou UniversityJishou 416000China Department of Environmental ScienceFaculty of ScienceAlexandria UniversityAlexandria 21511Egypt University of Chinese Academy of SciencesBeijing 100039China Botany and Microbiology DepartmentFaculty of ScienceHelwan UniversityCairo 11790Egypt School of GovernmentSun Yat-sen UniversityGuangzhou 510275China CAS Key Laboratory of Tropical Plant Resources and Sustainable UseXishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China National Authority for Remote Sensing and Space SciencesCairo 11790Egypt 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2019年第11卷第5期

页      面：637-651页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0815[工学-水利工程] 0705[理学-地理学] 

基　　金：funded by the National Key Research and Development Program of China (2016YFC0502101) the National Natural Science Foundation of China (31700544) the Chinese Academy of Sciences (CAS) "Light of West China" Program (2016XBZG-XBQNXZ-B005) 

主　　题：climate change human activities NDVI variation Qinghai-Tibet Plateau redundancy analysis vegetation net primary productivity 

摘      要：Climate change and human activities can influence vegetation net primary productivity(NPP), a key component of natural ecosystems. The Qinghai-Tibet Plateau of China, in spite of its significant natural and cultural values, is one of the most susceptible regions to climate change and human disturbances in the world. To assess the impact of climate change and human activities on vegetation dynamics in the grassland ecosystems of the northeastern Qinghai-Tibet Plateau, we applied a time-series trend analysis to normalized difference vegetation index(NDVI) datasets from 2000 to 2015 and compared these spatiotemporal variations with trends in climatic variables over the same time period. The constrained ordination approach(redundancy analysis) was used to determine which climatic variables or human-related factors mostly influenced the variation of NDVI. Furthermore, in order to determine whether current conservation measures and programs are effective in ecological protection and reconstruction, we divided the northeastern Qinghai-Tibet Plateau into two parts: the Three-River Headwater conservation area(TRH zone) in the south and the non-conservation area(NTRH zone) in the north. The results indicated an overall(73.32%) increasing trend of vegetation NPP in grasslands throughout the study area. During the period 2000–2015, NDVI in the TRH and NTRH zones increased at the rates of 0.0015/a and 0.0020/a, respectively. Specifically, precipitation accounted for 9.2% of the total variation in NDVI, while temperature accounted for 13.4%. In addition, variation in vegetation NPP of grasslands responded not only to long-and short-term changes in climate, as conceptualized in non-equilibrium theory, but also to the impact of human activities and their associated perturbations. The redundancy analysis successfully separated the relative contributions of climate change and human activities, of which village population and agricultural gross domestic product were the two most impor