期刊
NATURE GEOSCIENCE
卷 10, 期 4, 页码 284-+出版社
NATURE PORTFOLIO
DOI: 10.1038/NGEO2903
关键词
-
资金
- Columbia University's Center for Climate and Life
- DOE Early Career Award
- NSF CAREER grant
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据