气候变化领域集成服务门户(CCPortal): Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations

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DOI	10.5194/hess-24-5579-2020
	Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations
	Zhang M.; Yuan X.
发表日期	2020
ISSN	1027-5606
起始页码	5579
结束页码	5593
卷号	24 期号:11
英文摘要	A flash drought is characterized by its rapid onset and arouses widespread concerns due to its devastating impacts on the environment and society without sufficient early warnings. The increasing frequency of soil moisture flash droughts in a warming climate highlights the importance of understanding its impact on terrestrial ecosystems. Previous studies investigated the vegetation dynamics during several extreme cases of flash drought, but there is no quantitative assessment on how fast the carbon fluxes respond to flash droughts based on decade-long records with different climates and vegetation conditions. Here we identify soil moisture flash drought events by considering decline rate of soil moisture and the drought persistency, and we detect the response of ecosystem carbon and water fluxes to a soil moisture flash drought during its onset and recovery stages based on observations at 29 FLUXNET stations from croplands to forests. Corresponding to the sharp decline in soil moisture and higher vapor pressure deficit (VPD), gross primary productivity (GPP) drops below its normal conditions in the first 16 d and decreases to its minimum within 24 d for more than 50% of the 151 identified flash drought events, and savannas show highest sensitivity to flash drought. Water use efficiency increases for forests but decreases for cropland and savanna during the recovery stage of flash droughts. These results demonstrate the rapid responses of vegetation productivity and resistance of forest ecosystems to flash drought. © 2020 Georg Thieme Verlag. All rights reserved.
语种	英语
scopus关键词	Carbon; Ecosystems; Forestry; Soil moisture; Vegetation; Ecosystem productivity; Gross primary productivity; Quantitative assessments; Terrestrial ecosystems; Vapor pressure deficit; Vegetation condition; Vegetation productivity; Water use efficiency; Drought; data assimilation; drought stress; flash flood; net ecosystem production; net primary production; savanna; sensitivity analysis; soil moisture; vapor pressure; vegetation dynamics
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159250
作者单位	Zhang, M., Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Yuan, X., School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China
推荐引用方式 GB/T 7714	Zhang M.,Yuan X.. Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations[J],2020,24(11).
APA	Zhang M.,&Yuan X..(2020).Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations.Hydrology and Earth System Sciences,24(11).
MLA	Zhang M.,et al."Rapid reduction in ecosystem productivity caused by flash droughts based on decade-long FLUXNET observations".Hydrology and Earth System Sciences 24.11(2020).