Earlier peak photosynthesis timing potentially escalates global wildfires  

作　　者：Gengke Lai Jialing Li Jun Wang Chaoyang Wu Yongguang Zhang Constantin M.Zohner Josep Peñuelas Quansheng Ge 

机构地区：[1]International Institute for Earth System Sciences,Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing University,Nanjing 210023,China [2]Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology,Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources,School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China [3]The Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [4]Huangshan National Park Ecosystem Field Scientific Observation and Research Station of the Ministry of Education,Nanjing 210023,China [5]Jiangsu International Joint Carbon Neutrality Laboratory,Nanjing University,Nanjing 210023,China [6]Department of Environmental Systems Science,Institute of Integrative Biology,ETH Zurich,Zurich 8092,Switzerland [7]CSIC,Global Ecology Unit CREAF-CSIC-UAB,Barcelona 08193,Spain [8]CREAF,Cerdanyola del Vallès,Barcelona 08193,Spain

出　　处：《National Science Review》2024年第9期165-174,共10页国家科学评论（英文版）

基　　金：supported by the National Key Research and Development Program of China(2019YFA0606603 and 2019YFA0606601);supported by the National Natural Science Foundation of China(42125105);supported by the National Natural Science Foundation of China(42125101);supported by the Programme of Kezhen-Bingwei Excellent Young Scientists of the Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences(2022RC006);supported by SNF Ambizione(PZ00P3_193646);supported by the TED2021-132627B-I00 grant funded by the Spanish MCIN(AEI/10.13039/501100011033);the European Union NextGenerationEU/PRTR,the Fundación Ramón Areces project(CIVP20A6621);the Catalan government(SGR221-1333).

摘　　要：More intense fire weather due to climate change is implicated as a key driver of recent extreme wildfire events.As fuel stock,the role of vegetation and its phenology changes in wildfire dynamics,however is not fully appreciated.Using long-term satellite-based burned areas and photosynthesis observations,we reveal that an earlier peak photosynthesis timing(PPT)potentially acts to escalate subsequent wildfires,with an increase in the global average burned fraction of 0.021%(∼2.20 Mha)for every additional day of PPT advancement.Satellite observations and Earth System modeling consistently show that this fire escalation is likely due to intensified drought conditions and increased fuel availability associated with the climate feedback arising from earlier PPT.Current fire-enabled dynamic global vegetation models can reproduce the observed negative correlation between PPT and burned area but underestimate the strength of the relationship notably.Given the continued PPT advancement owing to climate change,the bioclimatic effects of vegetation phenology change suggest a potentially pervasive upward pressure on future wildfires.

关 键 词：vegetation photosynthesis phenology WILDFIRE climate feedback Earth System model 

分 类 号：X915.5[环境科学与工程—安全科学]