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增长阻力增强,但长期极端干旱下增长弹性没有下降

Xiaona Wang^1,2, Taoran Xu^1,2, Chenxi Xu³

¹State Key Laboratory of Earth Surface Processes and Resources Ecology, Beijing Normal University, Beijing, China.

Global change biology

|November 21, 2023

概括

树木的生长阻力和抗旱能力因地区和持续时间而异. 近几十年来,树木的抗旱能力和抗旱能力下降,地球系统模型往往误解了这些反应.

科学领域:

生态生态学生态生态学
气候科学气候科学
林业林业林业林业林业

背景情况:

气候变化正在增加极端干旱的频率和强度,影响森林健康.
了解树木生长阻力和抗旱能力对于预测森林对气候变化的反应至关重要.

研究的目的:

为了研究树木的生长阻力和适应不同持续时间的极端干旱的适应性如何在不同气候区和随着时间的推移而有所不同.
评估干旱持续时间和气候因素对树木生长反应的影响.
评估地球系统模型 (ESM) 在模拟干旱对树木生长的影响方面的表现.

主要方法:

利用了来自北半球2389个森林的树环时间表 (1901-2015年).
综合物种特异性植物功能特征和气候数据.
分析了与干旱持续时间和环境因素相关的生长阻力和弹性的时空模式.

主要成果:

增长阻力和对一年干旱的适应性在潮湿地区比干旱地区更高.
2年的干旱导致了比1年的干旱显著更高的增长阻力,而弹性没有显著差异.
近几十年 (1980-2015) 的树木生长表现出与早期时期 (1901-1979) 相比,对一年干旱的抵抗力和弹性下降.
随着干旱持续时间的增加,植物特征和土壤特性在生长反应上变得比气候因素更有影响.
地球系统模型 (ESM) 通常高估了生长阻力,低估了对干旱的抗性.

结论:

树木对干旱的反应是复杂的,因干旱的持续时间,气候和植物/土壤内在因素而有所不同.
长期和更强烈的干旱对森林的运作构成重大威胁.
迫切需要改善对树木干旱反应的生态生理学理解,以提高气候模型的准确性.

关键词:

地球系统模型.干旱持续时间干旱持续时间极端干旱导致的极端干旱.恢复力恢复力电阻的电阻是指电阻的电阻树环时间表.

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