气候变化领域集成服务门户(CCPortal): Response of ecosystem intrinsic water use efficiency and gross primary productivity to rising vapor pressure deficit

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DOI	10.1088/1748-9326/ab2603
	Response of ecosystem intrinsic water use efficiency and gross primary productivity to rising vapor pressure deficit
	Zhang Q.; Ficklin D.L.; Manzoni S.; Wang L.; Way D.; Phillips R.P.; Novick K.A.
发表日期	2019
ISSN	17489318
卷号	14 期号:7
英文摘要	Elevated vapor pressure deficit (VPD) due to drought and warming is well-known to limit canopy stomatal and surface conductance, but the impacts of elevated VPD on ecosystem gross primary productivity (GPP) are less clear. The intrinsic water use efficiency (iWUE), defined as the ratio of carbon (C) assimilation to stomatal conductance, links vegetation C gain and water loss and is a key determinant of how GPP will respond to climate change. While it is well-established that rising atmospheric CO2 increases ecosystem iWUE, historic and future increases in VPD caused by climate change and drought are often neglected when considering trends in ecosystem iWUE. Here, we synthesize long-term observations of C and water fluxes from 28 North American FLUXNET sites, spanning eight vegetation types, to demonstrate that ecosystem iWUE increases consistently with rising VPD regardless of changes in soil moisture. Another way to interpret this result is that GPP decreases less than surface conductance with increasing VPD. We also project how rising VPD will impact iWUE into the future. Results vary substantially from one site to the next; in a majority of sites, future increases in VPD (RCP 8.5, highest emission scenario) are projected to increase iWUE by 5%-15% by 2050, and by 10%-35% by the end of the century. The increases in VPD owing to elevated global temperatures could be responsible for a 0.13% year-1 increase in ecosystem iWUE in the future. Our results highlight the importance of considering VPD impacts on iWUE independently of CO2 impacts. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	FLUXNET; Hydrologic stress; stomatal closure; water use
语种	英语
scopus关键词	Carbon dioxide; Drought; Ecosystems; Efficiency; Hydrostatic pressure; Photosynthesis; Phytoplankton; Soil moisture; Vegetation; FluxNet; Gross primary productivity; Intrinsic water-use efficiencies; Long term observations; Stomatal closures; Stomatal conductance; Vapor pressure deficit; Water use; Climate change
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154503
作者单位	State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China; School of Public and Environmental Affairs, Indiana University, Bloomington, IN, United States; Department of Geography, Indiana University, Bloomington, IN, United States; Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Center for Climate Research, Stockholm University, Stockholm, Sweden; Department of Earth Sciences, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, IN, United States; Department of Biology, University of Western Ontario, London, ON, Canada; Department of Biology, Indiana University, Bloomington, IN, United States
推荐引用方式 GB/T 7714	Zhang Q.,Ficklin D.L.,Manzoni S.,et al. Response of ecosystem intrinsic water use efficiency and gross primary productivity to rising vapor pressure deficit[J],2019,14(7).
APA	Zhang Q..,Ficklin D.L..,Manzoni S..,Wang L..,Way D..,...&Novick K.A..(2019).Response of ecosystem intrinsic water use efficiency and gross primary productivity to rising vapor pressure deficit.Environmental Research Letters,14(7).
MLA	Zhang Q.,et al."Response of ecosystem intrinsic water use efficiency and gross primary productivity to rising vapor pressure deficit".Environmental Research Letters 14.7(2019).