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Ankit Shekhar¹, Lukas Hörtnagl¹, Nina Buchmann¹

¹Department of Environmental Systems Science, ETH Zürich, Zürich, Switzerland.

Global change biology

|June 29, 2023

概括

森林表现出对大气干旱的不同抵抗力和恢复能力,干燥的地区表现更好. 然而,日益增加的干旱趋势并不能持续改善森林的弹性,从而挑战了适应预测.

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:

大气干燥度,以蒸汽压力逆差 (VPD) 衡量,显著影响森林温室气体交换.
了解森林对极端干旱的反应对于预测气候变化下的生态系统弹性至关重要.

研究的目的:

量化森林净生态系统生产率 (NEP) 耐力和恢复的长期变化,以应对极端大气干旱.
测试森林生物物理特征和当地气象是否影响NEP抵抗和恢复.
调查极端干旱的日益增长趋势是否会随着时间的推移增强森林NEP的抵抗力和恢复.

主要方法:

利用60个全球森林地区 (1003个地点年) 的长期NEP测量 (10-30年).
采用数据驱动的统计学习方法来量化NEP阻力和恢复.
分析了森林类型,叶面积指数 (LAI) 和平均VPD对NEP反应的影响.

主要成果:

森林类型,LAI和局部VPD中位数解释了NEP耐药性和恢复的50%以上变异.
与较不干燥的森林地区相比,较干燥的森林地区表现出更高的NEP抵抗力和恢复能力.
极端干燥事件对NEP的影响持续长达3天,恢复不完全 (<100%).

结论:

森林特征和当地干旱程度是NEP抵抗力和恢复的关键决定因素.
与假设相反,极端干旱的增加趋势并没有始终提高森林NEP的抵抗力或恢复.
预计大气干燥率的增加可能不会像预期的那样提高森林的弹性.

关键词:

在 VPD VPD 的情况下.的共变性的共变性生态系统净生产率随机的森林随机的森林恢复恢复恢复恢复的时间电阻的阻力可以

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