文献类型： 外文期刊
第一作者： Li, Fei
作者： Li, Fei;Jin, Ke;Li, Bing;Li, Fei;Chen, Jiquan;Abraha, Michael;Xiao, Jingfeng;Ballantyne, Ashley;Ballantyne, Ashley;John, Ranjeet;John, Ranjeet
作者机构：
期刊名称：SCIENCE （ 影响因子：56.9； 五年影响因子：54.5 ）
ISSN： 0036-8075
年卷期： 2023 年 381 卷 6658 期
页码：
收录情况： SCI
摘要： The ratio of carbon assimilation to water evapotranspiration (ET) of an ecosystem, referred to as ecosystem water use efficiency (WUEeco), is widely expected to increase because of the rising atmospheric carbon dioxide concentration (C-a). However, little is known about the interactive effects of rising C-a and climate change on WUEeco. On the basis of upscaled estimates from machine learning methods and global FLUXNET observations, we show that global WUEeco has not risen since 2001 because of the asymmetric effects of an increased vapor pressure deficit (VPD), which depressed photosynthesis and enhanced ET. An undiminished ET trend indicates that rising temperature and VPD may play a more important role in regulating ET than declining stomatal conductance. Projected increases in VPD are predicted to affect the future coupling of the terrestrial carbon and water cycles.
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