广泛但不同的干旱遗产对整个生物群的初级生产率产生影响
Xin Yu1,2, René Orth1,3, Markus Reichstein1
1Department of Biogeochemical Integration, Max Planck Institute for Biogeochemistry, Jena, Germany.
Global change biology
|October 11, 2025
概括
干旱对生态系统的生产力产生持久影响,影响总初级生产率 (GPP) 在事件发生后长达一年. 这些"遗留效应"可以降低或增加GPP,特别是在森林中.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 生态系统动力学 生态系统动力学
背景情况:
- 干旱对生态系统的影响是直接的,也是有延迟的 (遗留效应).
- 之前的研究发现了干旱对树木生长和植被绿色的遗产.
- 对于干旱对生态系统规模流动的影响,如总初级生产率 (GPP) 的证据越来越多,但有限.
研究的目的:
- 调查全球干旱遗留影响对GPP的发生和特征.
- 量化这些遗留效应的规模和持续时间.
- 探索生态系统类型和脆弱性如何影响遗留效应.
主要方法:
- 分析了来自全球76个长期旋协变点的GPP数据.
- 包括来自至少7年测量的地点的数据.
- 在52个确定的干旱事件之前,期间和之后,比较了GPP.
主要成果:
- 在研究的52个干旱中,26个干旱对GPP产生了干旱遗留影响.
- 遗留效应的幅度与同时发生的干旱影响相当,持续时间长达一年.
- 19个干旱导致GPP下降 (负遗产),而7个则显示GPP增加 (积极遗产).
- 森林表现出更多的负面遗留效应,特别是那些具有更高水力脆弱性的森林.
结论:
- 干旱对GPP的遗留影响是全球相关和重要的.
- 这些影响可以是积极的或消极的,影响生态系统的恢复和功能.
- 将干旱遗留影响纳入评估中对于了解生态系统对气候变化的反应至关重要.
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