Inhibitive Effects of Recent Exceeding Air Temperature Optima of Vegetation Productivity and Increasing Water Limitation on Photosynthesis Reversed Global Greening

作者：Baozhang Chen, Ke Yu, Philippe Ciais, Zhenzhong Zeng, Andy Black, Honggang Lv, Mengtian Huang, Wenping Yuan, Xiangming Xiao, Junjun Fang, Kun Mean Hou, Ying‐Ping Wang, Yiqi Luo · 发表于：Earth s Future · 年份：2022 · DOI：10.1029/2022ef002788 · 被引用次数：17 · 研究领域：Plant Water Relations and Carbon Dynamics、Remote Sensing in Agriculture、Climate variability and models

Abstract Global terrestrial vegetation dynamics have been rapidly altered by climate change. A widespread vegetation greenness over a large part of the planet from the 1980s to early this century has been reported, whereas weakening of CO 2 fertilization effects and increasing climate extremes and the adverse impact of increasing rate of warming and severity of drought on vegetation growth were also reported. Earth system models project that the land carbon sink will decrease in size in response to an increase in warming during this century. How global vegetation is changing during this century in response to global warming and water availability across spatial and temporal scales remains uncertain. Our understanding of the widespread vegetation greening or browning processes and identifying the biogeochemical mechanisms remain incomplete. Here we use multiple long‐term satellite leaf area index (LAI) records to investigate vegetation growth trends from 1982 to 2018. We find that the widespread increase of growing‐season integrated LAI (greening) since 1980s was reversed ( p ‐value < 0.05) around the year 2000 over 90% of the global vegetated area, and continued in only 10% of the global vegetated area. The reversal of greening trend was largely explained by the inhibitive effects of excessive optimal temperature on photosynthesis in most of the tropics and low latitudes, and by increasing water limitation (increasing in atmospheric vapor pressure deficit and decreasing in...