Climate extremes and ozone pollution:a growing threat to China’s food security  

作　　者：Hanqin Tian Wei Ren Bo Tao Ge Sun Art Chappelka Xiaoke Wang Shufen Pan Jia Yang Jiyuan Liu Ben SFelzer Jerry MMelillo John Reilly 

机构地区：[1]International Center for Climate and Global Change Research,School of Forestry and Wildlife Sciences,Auburn University,Auburn,Alabama 36849 USA [2]Department of Plant and Soil Sciences,College of Agriculture,Food and Environment,University of Kentucky,Lexington,Kentucky 40506 USA [3]Eastern Forest Environmental Threat Assessment Center,USDA Forest Service,Raleigh,North Carolina,USA [4]State Key Lab of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085 China [5]Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101 China [6]Department of Earth and Environmental Sciences,Lehigh University,1 W.Packer Drive,Bethlehem,Pennsylvania 18015-3188 USA [7]The Ecosystem Center,Marine Biological Laboratory,Woods Hole,Massachusetts 02543 USA [8]Joint Program on Science and Policy of Global Change,Massachusetts Institute of Technology,77 Massachusetts Avenue,Cambridge,Massachusetts 02139 USA

出　　处：《Ecosystem Health and Sustainability》2016年第1期2-11,共10页生态系统健康与可持续性（英文）

基　　金：This study has been supported by NASA(NNG04GM39C,NNX08AL73G),NSF(1137306);Chinese Academy of Sciences(KFJ-EW STS 002);the National Basic Research Program of China(No.2010CB950900;No.2002CB412500);the U.S.Department of Energy(DE-FG02-94ER61937);the U.S.Environmental Protection Agency(XA-83600001-1)。

摘　　要：Ensuring global food security requires a sound understanding of climate and environmental controls on crop productivity.The majority of existing assessments have focused on physical climate vari-ables(i.e.,mean temperature and precipitation),but less on the increasing climate extremes(e.g.,drought)and their interactions with increasing levels of tropospheric ozone(O3).Here we quantify the combined impacts of drought and O3 on China’s crop yield using a comprehensive,process-based agricultural eco-system model in conjunction with observational data.Our results indicate that climate change/variability and O3 together led to an annual mean reduction of crop yield by 10.0%or 55 million tons per year at the national level during 1981-2010.Crop yield shows a growing threat from severe episodic droughts and in-creasing O3 concentrations since 2000,with the largest crop yield losses occurring in northern China,causing serious concerns in food supply security in China.Our results imply that reducing tropospheric O3 levels is critical for securing crop production in coping with increasing frequency and severity of extreme climate events such as droughts.Improving air quality should be a core component of climate adaptation strategies.

关 键 词：China food security climate change crop yield DROUGHT tropospheric ozone(O3). 

分 类 号：F42[经济管理—产业经济]