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气候梯度和叶碳投资影响气候变化对森林用水效率的影响:元分析

Shenglan Li^1,2,3, Evgenios Agathokleous^2,3, Shuangjiang Li^2,3

¹School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China.

Plant, cell & environment

|November 29, 2023

概括

森林森林森林森林

科学领域:

森林生态森林生态
气候变化科学气候变化科学
植物生态生理学植物生态生理学

背景情况:

森林是重要的碳汇,但它们的水碳循环易受气候变化的影响.
关于森林用水效率 (WUE) 响应和潜在机制存在不确定性.
气候变化因素,如二氧化碳的增加,干旱和温度显著影响森林生态系统.

研究的目的:

对二氧化碳 (eCO2) 增加,干旱和温度升高 (eT) 对森林WUE的影响进行元分析.
调查各种树种和全球地区的叶子和植物水平的WUE反应.
为了确定与WUE变化相关的度梯度和权衡.

主要方法:

80项实地研究的元分析,涵盖95种树种.
评估叶子内在的 (WUEi) 和瞬间的 (WUEt) WUE.
基于碳同位素的WUE和叶子碳含量的分析.

主要成果:

增加的二氧化碳 (eCO2) 和干旱增加了叶子水平的WUE (WUEi,WUEt).
高温 (eT) 增加了WUEi,但减少了基于碳同位素的WUE.
干旱引起的WUE随着度的增加而增加,而eCO2引起的WUE在北极40度以上下降.
低于eCO2的高WUE和干旱与较低的叶子碳含量相关,这表明与国防的潜在权衡.

结论:

森林WUE对气候变化的反应是复杂的,并且因环境因素和物种而异.
这些发现为改善森林碳水循环的气候模型提供了关键的生态生理学数据.
在WUE和防御机制之间潜在的权衡需要进一步研究森林弹性.

关键词:

气候变化气候变化气候变化森林是森林,森林是森林.地理分布地理分布.进行元分析.光合作用产品的产品.使用水的效率提高了水的使用效率.

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