气候变化领域集成服务门户(CCPortal): Soil moisture variation drives canopy water content dynamics across the western U.S.

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DOI	10.1016/j.rse.2020.112233
	Soil moisture variation drives canopy water content dynamics across the western U.S.
	Lyons D.S.; Dobrowski S.Z.; Holden Z.A.; Maneta M.P.; Sala A.
发表日期	2021
ISSN	00344257
卷号	253
英文摘要	Drought stress is a major contributing factor to plant mortality across the globe. Drought effects are often studied at the local scale, but recent advances in remote sensing allow for observations of plant water status across broad geographic scales. The vegetation optical depth (VOD) derived from satellite-based surface microwave emission has been shown to be sensitive to canopy water content, which is increasingly recognized as an important indicator of water relations and incipient mortality in plants. We develop an index which quantifies the normalized difference between night- and daytime diurnal VOD retrievals (nVODr) and apply it across the western U.S. to determine the relative sensitivity of plants to variations in water supply (soil moisture) and atmospheric water demand (vapor pressure deficit -VPD). Canopy water content dynamics were most sensitive to soil moisture variation at intermediate climatic water deficits where tree cover transitions to grass cover. These areas are in transitional climate zones and occur at ecotones between forest and non-forest vegetation where canopy water content dynamics are most sensitive to both soil moisture and VPD variation. Our results suggest that vegetation in semi-arid ecotones is likely to see the most proximal impacts of drought stress as the planet warms. © 2020 Elsevier Inc.
英文关键词	Canopy water content; Drought stress; Land surface-atmosphere coupling; Soil moisture; Vapor pressure deficit; Vegetation optical depth
语种	英语
scopus关键词	Drought; Dynamics; Ecology; Forestry; Remote sensing; Sensitivity analysis; Soil surveys; Vegetation; Video on demand; Water content; Water supply; Canopy water contents; Contributing factor; Microwave emissions; Moisture variation; Normalized differences; Relative sensitivity; Vapor pressure deficit; Vegetation optical depth; Soil moisture; diurnal variation; drought stress; grass; mortality; optical depth; remote sensing; semiarid region; soil moisture; vegetation cover; water content; Indicator indicator
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179004
作者单位	University of Montana W.A. Franke College of Forestry & Conservation, Department of Forest Management, 32 Campus Drive, Missoula, MT 59812, United States; US Forest Service, Northern Region 1, 26 Fort Missoula Road, Missoula, MT 59804, United States; University of Montana W.A. Franke College of Forestry & Conservation, Department of Geography, 32 Campus Drive, Missoula, MT 59812, United States; University of Montana College of Humanities & Sciences, Department of Geosciences, 32 Campus Drive, Missoula, MT 59812, United States; University of Montana College of Humanities & Sciences, Division of Biological Sciences, 32 Campus Drive, Missoula, MT 59812, United States
推荐引用方式 GB/T 7714	Lyons D.S.,Dobrowski S.Z.,Holden Z.A.,et al. Soil moisture variation drives canopy water content dynamics across the western U.S.[J],2021,253.
APA	Lyons D.S.,Dobrowski S.Z.,Holden Z.A.,Maneta M.P.,&Sala A..(2021).Soil moisture variation drives canopy water content dynamics across the western U.S..Remote Sensing of Environment,253.
MLA	Lyons D.S.,et al."Soil moisture variation drives canopy water content dynamics across the western U.S.".Remote Sensing of Environment 253(2021).