DOI: 10.1038/ngeo2400
论文题名: Tree mortality predicted from drought-induced vascular damage
作者: Anderegg W.R.L. ; Flint A. ; Huang C.-Y. ; Flint L. ; Berry J.A. ; Davis F.W. ; Sperry J.S. ; Field C.B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 5 起始页码: 367
结束页码: 371
语种: 英语
Scopus关键词: climate change
; data set
; dieback
; drought stress
; forest ecosystem
; global warming
; hydraulic conductivity
; Landsat
; mortality
; satellite imagery
; vascular plant
; vegetation structure
; United States
; Populus tremuloides
英文摘要: The projected responses of forest ecosystems to warming and drying associated with twenty-first-century climate change vary widely from resiliency to widespread tree mortality. Current vegetation models lack the ability to account for mortality of overstorey trees during extreme drought owing to uncertainties in mechanisms and thresholds causing mortality. Here we assess the causes of tree mortality, using field measurements of branch hydraulic conductivity during ongoing mortality in Populus tremuloides in the southwestern United States and a detailed plant hydraulics model. We identify a lethal plant water stress threshold that corresponds with a loss of vascular transport capacity from air entry into the xylem. We then use this hydraulic-based threshold to simulate forest dieback during historical drought, and compare predictions against three independent mortality data sets. The hydraulic threshold predicted with 75% accuracy regional patterns of tree mortality as found in field plots and mortality maps derived from Landsat imagery. In a high-emissions scenario, climate models project that drought stress will exceed the observed mortality threshold in the southwestern United States by the 2050s. Our approach provides a powerful and tractable way of incorporating tree mortality into vegetation models to resolve uncertainty over the fate of forest ecosystems in a changing climate. © 2015 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106291
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Ecology and Evolutionary Biology, Guyot Hall, Princeton University, Princeton, NJ, United States; United States Geological Survey, Sacramento, CA, United States; Department of Geography, National Taiwan University, Taipei, Taiwan; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States; Bren School of Environmental Science and Management, 2400 Bren Hall, University of California, Santa Barbara, CA, United States; Department of Biology, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Anderegg W.R.L.,Flint A.,Huang C.-Y.,et al. Tree mortality predicted from drought-induced vascular damage[J]. Nature Geoscience,2015-01-01,8(5)