DOI: 10.1038/ngeo2903
论文题名: Sensitivity of grassland productivity to aridity controlled by stomatal and xylem regulation
作者: Konings A.G. ; Williams A.P. ; Gentine P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 4 起始页码: 284
结束页码: 288
语种: 英语
Scopus关键词: aridity
; climate change
; data set
; grassland
; precipitation (climatology)
; primary production
; remote sensing
; sensitivity analysis
; stomatal conductance
; vapor pressure
; water content
; xylem
; United States
英文摘要: The terrestrial water and carbon cycles are coupled through plant regulation of stomatal closure. Both soil moisture and vapour pressure deficit - the amount of moisture in the air relative to its potential maximum - can govern stomatal closure, which reduces plant carbon uptake. However, plants vary in the degree to which they regulate their stomata - and in association, xylem conductance - in response to increasing aridity: isohydric plants exert tight regulation of stomata and the water content of the plant, whereas anisohydric plants do not. Here we use remote-sensing data sets of anisohydricity and vegetation greenness to show that productivity in United States grasslands - especially anisohydric ones - is far more sensitive to variations in vapour pressure deficit than to variations in precipitation. Anisohydric ecosystem productivity is over three times more sensitive to vapour pressure deficit than isohydric ecosystem productivity. The precipitation sensitivity of summer productivity increases with anisohydricity only for the most anisohydric ecosystems. We conclude that increases in vapour pressure deficit rather than changes in precipitation - both of which are expected impacts of climate change - will be a dominant influence on future grassland productivity. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105804
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 Earth and Environmental Engineering, Columbia University, New York, NY, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Earth Institute, Columbia University, New York, NY, United States
Recommended Citation:
Konings A.G.,Williams A.P.,Gentine P.. Sensitivity of grassland productivity to aridity controlled by stomatal and xylem regulation[J]. Nature Geoscience,2017-01-01,10(4)