Exposures to temperature beyond threshold disproportionately reduce vegetation growth in the northern hemisphere

查看全文 作　　者：Xiuchen [1,2]Wu;Weichao [3]Guo;Hongyan [3]Liu;Xiaoyan [1,2]Li;Changhui [4]Peng;Craig [5]D.Allen;Cicheng [2]Zhang;Pei [1,2]Wang;Tingting [2]Pei;Yujun [1,2]Ma;Yuhong [2]Tian;Zhaoliang [6]Song;Wenquan [2]Zhu;Yang [2]Wang;Zongshan [7]Li;Deliang [8]Chen

机构地区：[1]State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China;[2]Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China;[3]College of Urban and Environmental Science,Peking University,Beijing 100871,China;[4]Institute of Environment Sciences,University of Quebec at Montreal,Quebec G1K 9H7,Canada;[5]US Geological Survey,Fort Collins Science Center,Jemez Mountains Field Station,Los Alamos,NM,87544,USA;[6]Institute of the Surface-Earth System Science Research,Tianjin University,Tianjin 300072,China;[7]State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;[8]Regional Climate Group,Department of Earth Sciences,University of Gothenburg,Gothenburg 460,Sweden

出　　处：《National Science Review》索引2019年第6卷第4期,共10页

基　　金：financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100102);the National Natural Science Foundation of China(41790422,41530747,41390462 and 41571038);the project of the State Key Laboratory of Earth Surface Processes and Resource Ecology(2017-ZY-06);supported by the Swedish STINT,Formas,BECC,MERGE and Formas 摘　　要：In recent decades,terrestrial vegetation in the northern hemisphere(NH)has been exposed to warming and more extremely high temperatures.However,the consequences of these changes for terrestrial vegetation growth remain poorly quantifed and understood.By examining a satellite-based vegetation index,tree-ring measurements and land-surface model simulations,we discovered a consistent convex patern in the responses of vegetation growth to temperature exposure(TE)for forest,shrub and grass in both the temperate(30°-50°N)and boreal(50°-70°N)NH during the period of 1982-2012.Te response of vegetation growth to TE for the three vegetation types in both the temperate and boreal NH increased convergently with increasing temperature,until vegetation type-dependent temperature thresholds were reached.A TE beyond these temperature thresholds resulted in disproportionately weak positive or even strong negative responses.Vegetation growth in the boreal NH was more vulnerable to extremely high-temperature events than vegetation growth in the temporal NH.Te non-linear responses discovered here provide new insights into the dynamics of northern terrestrial ecosystems in a warmer world. 关键词：TEMPERATURE exposure vegetation growth EXTREMELY high TEMPERATURE non-linear response TEMPERATE and BOREAL northern HEMISPHERE

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Exposures to temperature beyond threshold disproportionately reduce vegetation growth in the northern hemisphere

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