干旱区生态环境知识资源中心(Arid): Detection of drought-induced blue oak mortality in the Sierra Nevada Mountains, California

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DOI	10.1002/ecs2.3558
	Detection of drought-induced blue oak mortality in the Sierra Nevada Mountains, California
	Huesca, Margarita; Ustin, Susan L.; Shapiro, Kristen D.; Boynton, Ryan; Thorne, James H.
通讯作者	Huesca, M (corresponding author), Univ Calif Davis, Ctr Spatial Technol & Remote Sensing CSTARS, John Muir Inst Environm, Davis, CA 95616 USA. ; Huesca, M (corresponding author), Univ Calif Davis, Dept Environm Sci & Policy, Davis, CA 95616 USA. ; Huesca, M (corresponding author), Univ Twente, Fac Geoinformal Ion Sci & Earth Observat, Nat Resources Dept, Enschede, Netherlands.
来源期刊	ECOSPHERE
ISSN	2150-8925
出版年	2021
卷号	12 期号:6
英文摘要	From 2011 to 2016, California experienced a millennial-intensity drought, generating high levels of tree mortality. Remote sensing has been used to monitor the long-term impacts of drought; however, discriminating dead from live trees in arid and semiarid deciduous woodlands is challenging. The goals of this study were to assess and map the spatial patterns of drought-induced tree mortality in a blue oak (Quercus douglasii) woodland, a highly drought-tolerant species forming savannas along the lower foothills surrounding California's Central Valley. Airborne hyperspectral imagery was used to identify the most important wavelength regions predicting drought-induced blue oak mortality. The best metric to predict canopy stress was a normalized ratio using the spectral bands 937.53 and 1100.08 nm with a correlation with tree mortality of R-2 = 0.83. The image prediction of mortality for nine field plots found that 16 of 98 trees died (17.9%) during the drought. We further evaluated tree mortality in 82 independent plots, and we found the greatest image predictive accuracy for tree mortality between 1% and 10%. When applied at the landscape level, the regression-based index found mortality ranged from 1% to more than 51% in oak stands with an average mortality of 10% over the entire study region. In addition, tree mortality at landscape level showed higher tree mortality in blue oaks on south-facing aspects probably because of higher insolation rates and in sites with low potential for accumulated drainage.
英文关键词	blue oak drought drought-induced mortality imaging spectroscopy data
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000667707100047
WOS关键词	CARBON-DIOXIDE EXCHANGE ; INDUCED TREE MORTALITY ; QUERCUS-DOUGLASII ; CLIMATE-CHANGE ; STOMATAL CONDUCTANCE ; IMAGING SPECTROSCOPY ; BIOTIC DISTURBANCES ; SPATIAL-PATTERNS ; TIME-SERIES ; DIE-OFF
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368710
作者单位	[Huesca, Margarita; Ustin, Susan L.; Shapiro, Kristen D.] Univ Calif Davis, Ctr Spatial Technol & Remote Sensing CSTARS, John Muir Inst Environm, Davis, CA 95616 USA; [Huesca, Margarita; Shapiro, Kristen D.; Boynton, Ryan; Thorne, James H.] Univ Calif Davis, Dept Environm Sci & Policy, Davis, CA 95616 USA; [Huesca, Margarita] Univ Twente, Fac Geoinformal Ion Sci & Earth Observat, Nat Resources Dept, Enschede, Netherlands
推荐引用方式 GB/T 7714	Huesca, Margarita,Ustin, Susan L.,Shapiro, Kristen D.,et al. Detection of drought-induced blue oak mortality in the Sierra Nevada Mountains, California[J]. University of California, Davis,2021,12(6).
APA	Huesca, Margarita,Ustin, Susan L.,Shapiro, Kristen D.,Boynton, Ryan,&Thorne, James H..(2021).Detection of drought-induced blue oak mortality in the Sierra Nevada Mountains, California.ECOSPHERE,12(6).
MLA	Huesca, Margarita,et al."Detection of drought-induced blue oak mortality in the Sierra Nevada Mountains, California".ECOSPHERE 12.6(2021).