The 2012 Flash Drought Threatened US Midwest Agroecosystems

doi:10.1007/s11769-019-1066-7

	The 2012 Flash Drought Threatened US Midwest Agroecosystems
	Jin, Cui 1; Luo, Xue 1; Xiao, Xiangming 2,3; Dong, Jinwei 4; Li, Xueming 1; Yang, Jun 1; Zhao, Deyu 4
刊名	CHINESE GEOGRAPHICAL SCIENCE
	2019-10-01
卷号	29 期号:5 页码:768-783
关键词	food security terrestrial carbon cycling eddy covariance Vegetation Photosynthesis Model sun-induced fluorescence (SIF)
ISSN号	1002-0063
DOI	10.1007/s11769-019-1066-7
通讯作者	Zhao, Deyu(zhaody@igsnrr.ac.cn)
英文摘要	In the summer of 2012, the US Midwest, the most productive agricultural region in the world, experienced the most intense and widespread drought on record for the past hundred years. The 2012 drought, characterized as 'flash drought', developed in May with a rapid intensification afterwards, and peaked in mid-July. similar to 76% of crop region and 60% of grassland and pasture regions have been under moderate to severe dry conditions. This study used multiple lines of evidences, i.e., in-situ AmeriFlux measurements, spatial satellite observations, and scaled ecosystem modeling, to provide independent and complementary analysis on the impact of 2012 flash drought on the US Midwest vegetation greenness and photosynthesis carbon uptake. Three datasets consistently showed that 1) phenological activities of all biomes advanced 1-2 weeks earlier in 2012 compared to the other years of 2010-2014; 2) the drought had a more severe impact on agroecosystems (crop and grassland) than on forests; 3) the growth of crop and grassland was suppressed from June with significant reduction of vegetation index, sun-induced fluorescence (SIF) and gross primary production (GPP), and did not recover until the end of growing season. The modeling results showed that regional total GPP in 2012 was the lowest (1.76 Pg C/yr) during 2010-2014, and decreased by 63 Tg C compared with the other-year mean. Agroecosystems, accounting for 84% of regional GPP assimilation, were the most impacted by 2012 drought with total GPP reduction of 9%, 7%, 6%, and 29% for maize, soybean, cropland, and grassland, respectively. The frequency and severity of droughts have been predicted to increase in future. The results imply the importance to investigate the influences of flash droughts on vegetation productivity and terrestrial carbon cycling.
资助项目	National Natural Science Foundation of China[41801340] ; Natural Science Foundation of Liaoning, China[20180550238] ; Key Research Program of Frontier Sciences by Chinese Academy of Sciences[QYZDB-SSW-DQC005]
WOS关键词	GROSS PRIMARY PRODUCTION ; TERRESTRIAL CARBON-CYCLE ; CHLOROPHYLL FLUORESCENCE ; PRIMARY PRODUCTIVITY ; UNITED-STATES ; CLIMATE DATA ; VEGETATION ; REDUCTION ; FOREST ; PHOTOSYNTHESIS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000494481000004
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Liaoning, China ; Key Research Program of Frontier Sciences by Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131868]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhao, Deyu
作者单位	1.Liaoning Normal Univ, Coll Urban & Environm, Dalian 116029, Peoples R China 2.Univ Oklahoma, Dept Microbiol & Plant Biol, Ctr Spatial Anal, Norman, OK 73019 USA 3.Fudan Univ, Minist Educ, Inst Biodivers Sci, Key Lab Biodivers Sci & Ecol Engn, Shanghai 200433, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Jin, Cui,Luo, Xue,Xiao, Xiangming,et al. The 2012 Flash Drought Threatened US Midwest Agroecosystems[J]. CHINESE GEOGRAPHICAL SCIENCE,2019,29(5):768-783.
APA	Jin, Cui.,Luo, Xue.,Xiao, Xiangming.,Dong, Jinwei.,Li, Xueming.,...&Zhao, Deyu.(2019).The 2012 Flash Drought Threatened US Midwest Agroecosystems.CHINESE GEOGRAPHICAL SCIENCE,29(5),768-783.
MLA	Jin, Cui,et al."The 2012 Flash Drought Threatened US Midwest Agroecosystems".CHINESE GEOGRAPHICAL SCIENCE 29.5(2019):768-783.