DOI: 10.1073/pnas.2008345117
论文题名: Multidecadal records of intrinsic water-use efficiency in the desert shrub Encelia farinosa reveal strong responses to climate change
作者: Driscoll A.W. ; Bitter N.Q. ; Sandquist D.R. ; Ehleringer J.R.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 31 起始页码: 18161
结束页码: 18168
语种: 英语
英文关键词: Carbon isotopes
; Climate change
; Iwue
; Mojave desert
; Stomatal conductance
Scopus关键词: carbon dioxide
; water
; agricultural parameters
; Article
; climate change
; concentration (parameter)
; controlled study
; Encelia farinosa
; environmental change
; health survey
; nonhuman
; precipitation
; prediction
; priority journal
; shrub
; temperature measurement
; temperature stress
; vapor pressure
; water stress
; Asteraceae
; desert climate
; drought
; metabolism
; physiology
; Asteraceae
; Carbon Dioxide
; Climate Change
; Desert Climate
; Droughts
; Water
英文摘要: While tree rings have enabled interannual examination of the influence of climate on trees, this is not possible for most shrubs. Here, we leverage a multidecadal record of annual foliar carbon isotope ratio collections coupled with 39 y of survey data from two populations of the drought-deciduous desert shrub Encelia farinosa to provide insight into water-use dynamics and climate. This carbon isotope record provides a unique opportunity to examine the response of desert shrubs to increasing temperature and water stress in a region where climate is changing rapidly. Population mean carbon isotope ratios fluctuated predictably in response to interannual variations in temperature, vapor pressure deficit, and precipitation, and responses were similar among individuals. We leveraged the well-established relationships between leaf carbon isotope ratios and the ratio of intracellular to ambient CO2 concentrations to calculate intrinsic water-use efficiency (iWUE) of the plants and to quantify plant responses to longterm environmental change. The population mean iWUE value increased by 53 to 58% over the study period, much more than the 20 to 30% increase that has been measured in forests [J. Peñuelas, J. G. Canadell, R. Ogaya, Glob. Ecol. Biogeogr. 20, 597-608 (2011)]. Changes were associated with both increased CO2 concentration and increased water stress. Individuals whose lifetimes spanned the entire study period exhibited increases in iWUE that were very similar to the population mean, suggesting that there was significant plasticity within individuals rather than selection at the population scale. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164094
Appears in Collections: 气候变化与战略
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作者单位: Driscoll, A.W., School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, United States; Bitter, N.Q., School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, United States; Sandquist, D.R., Department of Biological Science, California State University, Fullerton, CA 92834, United States; Ehleringer, J.R., School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, United States
Recommended Citation:
Driscoll A.W.,Bitter N.Q.,Sandquist D.R.,et al. Multidecadal records of intrinsic water-use efficiency in the desert shrub Encelia farinosa reveal strong responses to climate change[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(31)