气候变化领域集成服务门户(CCPortal): Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought

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DOI	10.1073/pnas.2118052118
	Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought
	Kannenberg S.A.; Driscoll A.W.; Szejner P.; Anderegg W.R.L.; Ehleringer J.R.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:52
英文摘要	Globally, intrinsic water-use efficiency (iWUE) has risen dramatically over the past century in concert with increases in atmospheric CO2concentration. This increase could be further accelerated by long-term drought events, such as the ongoing multidecadal "megadrought" in the American Southwest. However, direct measurements of iWUE in this region are rare and largely constrained to trees, which may bias estimates of iWUE trends toward more mesic, high elevation areas and neglect the responses of other key plant functional types such as shrubs that are dominant across much of the region. Here, we found evidence that iWUE is increasing in the Southwest at one of the fastest rates documented due to the recent drying trend. These increases were particularly large across three common shrub species, which had a greater iWUE sensitivity to aridity than Pinus ponderosa, a common tree species in the western United States. The sensitivity of both shrub and tree iWUE to variability in atmospheric aridity exceeded their sensitivity to increasing atmospheric [CO2]. The shift to more water-efficient vegetation would be, all else being equal, a net positive for plant health. However, ongoing trends toward lower plant density, diminished growth, and increasing vegetation mortality across the Southwest indicate that this increase in iWUE is unlikely to offset the negative impacts of aridification. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Climate change; Drought; IWUE; Stable isotopes; Tree rings
语种	英语
scopus关键词	carbon; carbon dioxide; water; climate change; drought; ecosystem; forest; metabolism; tree; water cycle; Carbon Dioxide; Carbon Isotopes; Climate Change; Droughts; Ecosystem; Forests; Trees; Water; Water Cycle
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250901
作者单位	School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, United States; Instituto de Geología, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico; Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, United States
推荐引用方式 GB/T 7714	Kannenberg S.A.,Driscoll A.W.,Szejner P.,et al. Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought[J],2021,118(52).
APA	Kannenberg S.A.,Driscoll A.W.,Szejner P.,Anderegg W.R.L.,&Ehleringer J.R..(2021).Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought.Proceedings of the National Academy of Sciences of the United States of America,118(52).
MLA	Kannenberg S.A.,et al."Rapid increases in shrubland and forest intrinsic water-use efficiency during an ongoing megadrought".Proceedings of the National Academy of Sciences of the United States of America 118.52(2021).