Response of vegetation to drought in the Tibetan Plateau: Elevation differentiation and the dominant factors

植被(病理学) 环境科学 增强植被指数 草原 生态系统 自然地理学 高原(数学) 降水 空间异质性 归一化差异植被指数 仰角(弹道) 蒸散量 气候变化 生态学 地理 生物 植被指数 气象学 病理 数学分析 医学 数学 几何学
作者
Yijia Wang,Bojie Fu,Yanxu Liu,Yan Li,Xiaoming Feng,Shuai Wang
出处
期刊:Agricultural and Forest Meteorology [Elsevier BV]
卷期号:306: 108468-108468 被引量:82
标识
DOI:10.1016/j.agrformet.2021.108468
摘要

With a typical alpine grassland ecosystem, the Tibetan Plateau (TP) is a highly representative region to observe the effects of climate change on ecosystems. Continued global warming has increased the drought risk of TP, yet the response of vegetation to drought remains unclear. To understand the spatial heterogeneity of the vegetation response to drought and identify the key control factors of vegetation response to drought in different elevation intervals on TP, we introduced three vegetation indexes (EVI, LAI, and GPP) and multi-scale drought indexes, including the Standardized Precipitation Index (SPI) and Standardized Precipitation–Evapotranspiration Index (SPEI), to determine the spatial response of vegetation growth to drought from 2000 to 2015. Land surface temperature (LST), land cover, snow cover, population density, and soil texture were selected as potential control factors. The mean values of the maximum correlation coefficients for the six combinations indicated that 14.3%/12.0% (SPI/SPEI) of the vegetation growth on TP was significantly affected by water conditions (p < 0.05). The extent of vegetation growth responses to drought were mainly influenced by LST with the highest contribution rate of 65.8% at 3000-4500 m intervals. The response time is mainly dependent on the proportion of grassland, with the highest contribution rate of 81.7% at 4500-6000 m intervals. The results provide reasonable evidence for understanding the spatial heterogeneity of the elevation dependence of the alpine ecosystem response to drought.
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