文献类型：期刊文献

英文题名：Grassland production in response to changes in biological metrics over the Tibetan Plateau

作者：Jin, Jiaxin[1,2] Ma, Xuanlong[3,4] Chen, Huai[5] Wang, Han[6] Kang, Xiaoming[7] Wang, Xufeng[8] Wang, Ying[9] Yong, Bin[1,2] Guo, Fengsheng[2]

第一作者：Jin, Jiaxin

通信作者：Jin, JX[1]

机构：[1]Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;[2]Hohai Univ, Sch Earth Sci & Engn, Nanjing, Jiangsu, Peoples R China;[3]German Ctr Integrat Biodivers Res iDiv, D-04103 Leipzig, Germany;[4]Max Planck Inst Biogeochem, Jena, Germany;[5]Chinese Acad Sci, Chengdu Inst Biol, Chengdu, Sichuan, Peoples R China;[6]Tsinghua Univ, Dept Earth Syst Sci, Beijing, Peoples R China;[7]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China;[8]Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China;[9]Sanjiang Univ, Sch Culture Ind & Tourism Management, Nanjing, Jiangsu, Peoples R China

年份：2019

卷号：666

起止页码：641-651

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20190806543793);Scopus(收录号：2-s2.0-85061870193);WOS:【SCI-EXPANDED(收录号:WOS:000463180700061)】；

基金：This work was supported by the National Key Research and Development Program of China (2018YFA0605402), the National Natural Science Foundation of China (Nos. 41601442 & 41807173), and the Fundamental Research Funds for the Central Universities (No. 2017B06814). We thank the NASA Land Processes Distributed Active Archive Centre, U.S. Geological Survey/Earth Resources Observation and Science Centre, ESA Climate Changer Initiative Land Cover project and Cold and Arid Regions Science Data Center at Lanzhou to provide the satellite and climate data. All coauthors declare that there is no conflict of interests.

语种：英文

外文关键词：Biological regulation; Phonology; Grassland; The Tibetan Plateau; Remote sensing

摘要：A clear interannual variability in annual production of grasslands (termed AEVI) has been reported over the Tibetan Plateau (TP), but the underlying mechanism has not been fully understood. Here, we explained the interannual variability of AEVI during 2001-2015 by two phenological metrics (the start and end of the growing season, termed SOS and EOS, respectively) and one physiological metric (the maximum capacity of canopy light absorbance, termed MEVI) using MODIS Enhanced Vegetation Index (EVI) data over the TP. The results showed that the interannual variability of AEVI can be well attributed to not only the trends of, but also the sensitivities of AEVI to, the selected biological metrics. On the one hand, the advancing SOS and delaying EOS dominated the study area while both increased and decreased MEVI were observed. On the other hand, the AEVI responded negatively to the SOS and positively to the EOS and MEVI, exhibiting significant variations along the temperature and precipitation gradients. Hence, the current interannual variability of SOS and EOS mainly increased the AEVI; meanwhile, both enhancement and suppression of the interannual variability of MEVI to the AEVI were widespread over the TP. Overall, the interannual variability of MEVI mostly contributed to that of the AEVI, indicating a dominant role of the physiological metric rather than phenological metrics in carbon gain of TP grasslands. The achievements of this study are helpful to understand the underlying biological causes of the interannual variability of grassland production over the TP. (C) 2019 Elsevier B.V. All rights reserved.