气候变化领域集成服务门户(CCPortal): Increasing impacts of extreme droughts on vegetation productivity under climate change

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DOI	10.1038/s41558-019-0630-6
	Increasing impacts of extreme droughts on vegetation productivity under climate change
	Xu C.; McDowell N.G.; Fisher R.A.; Wei L.; Sevanto S.; Christoffersen B.O.; Weng E.; Middleton R.S.
发表日期	2019
ISSN	1758678X
卷号	9 期号:12
英文摘要	Terrestrial gross primary production (GPP) is the basis of vegetation growth and food production globally1 and plays a critical role in regulating atmospheric CO2 through its impact on ecosystem carbon balance. Even though higher CO2 concentrations in future decades can increase GPP2, low soil water availability, heat stress and disturbances associated with droughts could reduce the benefits of such CO2 fertilization. Here we analysed outputs of 13 Earth system models to show an increasingly stronger impact on GPP by extreme droughts than by mild and moderate droughts over the twenty-first century. Due to a dramatic increase in the frequency of extreme droughts, the magnitude of globally averaged reductions in GPP associated with extreme droughts was projected to be nearly tripled by the last quarter of this century (2075–2099) relative to that of the historical period (1850–1999) under both high and intermediate GHG emission scenarios. By contrast, the magnitude of GPP reductions associated with mild and moderate droughts was not projected to increase substantially. Our analysis indicates a high risk of extreme droughts to the global carbon cycle with atmospheric warming; however, this risk can be potentially mitigated by positive anomalies of GPP associated with favourable environmental conditions. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124283
作者单位	Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Earth Systems Analysis and Modeling Division, Pacific Northwest National Laboratory, Richland, WA, United States; Climate and Global Dynamics, National Center for Atmospheric Research, Boulder, CO, United States; Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique, Toulouse, France; Key Laboratory of Western China’s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China; Department of Biology and School of Earth, Environmental, and Marine Sciences, The University of Texas Rio Grande Valley, Edinburg, TX, United States; Center for Climate Systems Research, Columbia University and NASA Goddard Institute for Space Studies, New York, NY, United States
推荐引用方式 GB/T 7714	Xu C.,McDowell N.G.,Fisher R.A.,et al. Increasing impacts of extreme droughts on vegetation productivity under climate change[J],2019,9(12).
APA	Xu C..,McDowell N.G..,Fisher R.A..,Wei L..,Sevanto S..,...&Middleton R.S..(2019).Increasing impacts of extreme droughts on vegetation productivity under climate change.Nature Climate Change,9(12).
MLA	Xu C.,et al."Increasing impacts of extreme droughts on vegetation productivity under climate change".Nature Climate Change 9.12(2019).