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Updated: Jan 13, 2026

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

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Published on: December 31, 2012

全球分布和叶子水平内在用水效率的变化及其对水压力的反应

Xiang Wang¹, Zheng Fu², Philippe Ciais³

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

Nature communications

|January 7, 2026

概括

全球植物用水效率 (iWUE) 正在提高,特别是在更冷,更干燥的地区. 然而,随着气候变暖,不断上升的水压力可能会减缓这一趋势,影响植物的反应.

科学领域:

生态生态学生态生态学
植物生理学植物生理学
气候科学气候科学

背景情况:

内在用水效率 (iWUE) 量化了植物在光合作用过程中的用水支出.
叶子iWUE的全球动态和水应激反应尚未得到充分理解.

研究的目的:

用机器学习和碳同位素数据阐明叶子iWUE的全球模式,趋势和水应激反应.
调查水应力和蒸汽压力缺陷等环境因素对iWUE的影响.

主要方法:

利用机器学习模型和碳同位素在C3树叶中的观测.
分析了全球iWUE模式,2001-2020年的趋势以及生物群特定的差异.

主要成果:

在寒冷干旱地区观察到高的iWUE;在温暖潮湿的地区观察到较低的iWUE.
全球iWUE从2001年到2020年增加了0.2±0.02μmolmol-1年-1.
草地具有最高的iWUE,常青宽叶森林显示增长最快;iWUE随着水压升高,但增长速度随着强度的下降而下降.
蒸汽压力缺陷是一个比土壤水分更重要的驱动因素.

结论:

随着持续的变暖,不断增加的水压力可能会减缓全球iWUE的增加.
生态最佳性模型部分复制空间模式,但高估了iWUE及其趋势.

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