Radiative trigger thresholds of foliar photoprotective pigment regulation for global vegetation  

作　　者：Wenjin Wu Howard Epstein Xiyan Xu Xinwu Li Huadong Guo Jinfeng Li 

机构地区：[1]International Research Center of Big Data for Sustainable Development Goals,Beijing 100094,China [2]Key Laboratory of Digital Earth Sciences,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China [3]Key Laboratory of Earth Observation of Hainan Province,Hainan Research Institute,Aerospace Information Research Institute,Chinese Academy of Sciences,Sanya 572029,China [4]Department of Environmental Sciences,University of Virginia,Charlottesville,VA,USA [5]Key Laboratory of Regional Climate-Environment for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [6]State Key Laboratory of Plant Diversity and Specialty Crops,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

出　　处：《The Innovation》2024年第4期55-61,54,共8页创新（英文）

基　　金：cofunded by the Innovative Research Program of the International Research Center of Big Data for Sustainable Development Goals(CBAS2022IRP03);the National Science Foundation of China(42276241);the International Joint Research Project of Chinese Academy of Sciences(183611KYSB20200059).

摘　　要：Adjustments in foliar photoprotective pigments are crucial for plant adaptation to harsh environments,serving as indicators of environmental stress.However,understanding when and where these adjustments occur across diverse biomes remains unclear due to challenges in large-scale observation.Here,we propose a novel approach to assess dynamics in photoprotective pigments at the canopy level using a new index derived from spaceborne optical sensors.This approach generates a global map depicting the daily mean shortwave radiation threshold at which adjustments typically occur under prevailing climatic conditions.The global average of this threshold is 262±50 W m⁻2,with lower values at high latitudes and peaks near 40in both hemispheres.Temperature exerts a stronger influence on this latitudinal pattern than humidity.Future projections suggest a decrease in this threshold over northern high latitudes,implying exacerbated vulnerability under identical radiation levels due to negative warming responses.Based on this threshold,a high-stress zone around 60N is identified and is predicted to shift southward in the future.These findings bridge critical gaps in photoprotection research and offer a new perspective on understanding the biogeochemical cycles of global ecosystems.This framework can also enhance our ability to predict the fate of diverse ecosystems under future climate.

关 键 词：LATITUDE prevailing humidity 

分 类 号：Q94[生物学—植物学]