Response of vegetation NDVI to climatic extremes in the arid region of Central Asia: a case study in Xinjiang, China

被引：11
作者：
Junqiang Yao
Yaning Chen
Yong Zhao
Weiyi Mao
Xinbing Xu
Yang Liu
Qing Yang
机构：
[1] China Meteorological Administration,Institute of Desert Meteorology
[2] Chinese Academy of Sciences,State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography
[3] Chengdu University of Information Technology,School of Atmospheric Science
[4] Xinjiang Normal University,College of Earth and Environmental Sciences
[5] Lanzhou University,College of Resources and Environment Sciences, Key Laboratory of Oasis Ecology of Ministry of Education
[6] Xinjiang University,undefined
来源：
Theoretical and Applied Climatology | 2018年 / 131卷
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摘要：
Observed data showed the climatic transition from warm-dry to warm-wet in Xinjiang during the past 30 years and will probably affect vegetation dynamics. Here, we analyze the interannual change of vegetation index based on the satellite-derived normalized difference vegetation index (NDVI) with temperature and precipitation extreme over the Xinjiang, using the 8-km NDVI third-generation (NDVI3g) from the Global Inventory Modelling and Mapping Studies (GIMMS) from 1982 to 2010. Few previous studies analyzed the link between climate extremes and vegetation response. From the satellite-based results, annual NDVI significantly increased in the first two decades (1981–1998) and then decreased after 1998. We show that the NDVI decrease over the past decade may conjointly be triggered by the increases of temperature and precipitation extremes. The correlation analyses demonstrated that the trends of NDVI was close to the trend of extreme precipitation; that is, consecutive dry days (CDD) and torrential rainfall days (R24) positively correlated with NDVI during 1998–2010. For the temperature extreme, while the decreases of NDVI correlate positively with warmer mean minimum temperature (Tnav), it correlates negatively with the number of warmest night days (Rwn). The results suggest that the climatic extremes have possible negative effects on the ecosystem.
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页码：1503 / 1515
页数：12
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