干旱的持续时间超过了干旱的强度,这决定了生态系统恢复时间
Lu Chen1, Zhihui Lin2, Haotian Li1
1School of Geography and Tourism, Shaanxi Normal University, Xi'an, China.
The Science of the total environment
|November 29, 2025
概括
生态系统通常在2-5个月内从干旱中恢复,但恢复时间取决于干旱的持续时间和严重程度. Woody植物和干旱地区显示更长时间的干旱遗留效应,影响陆地碳汇.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 干旱越来越多地威胁着全球生态系统的稳定.
- 了解生态系统恢复和干旱遗留影响至关重要,但有限.
- 整个生态系统干旱恢复的空间和时间变化尚未得到充分理解.
研究的目的:
- 系统地调查各种生态系统的干旱恢复时间和遗留影响.
- 确定影响生态系统干旱恢复的关键驱动因素.
- 评估干旱特征 (持续时间,严重程度) 如何影响恢复.
主要方法:
- 利用了2001-2020年以太阳能诱导的基光为基础的初级生产总值 (GOSIF-GPP) 数据.
- 采用随机森林模型来确定干旱恢复驱动因素.
- 分析了恢复时间,遗留效应和各种生物群中的影响因素.
主要成果:
- 大多数生态系统 (80.5%) 在2-5个月内恢复.
- 恢复时间随着干旱持续时间和严重程度的增加而增加;长期的中度干旱需要比短时间的严重干旱更长时间才能恢复.
- 总初级生产率损失是恢复时间的主要驱动因素 (24.8%),其次是温度 (11.7%) 和太阳辐射 (11.2%).
- 木质植物 (到3年恢复46.2%) 和干旱的生态系统比草本植物 (到3年恢复53.1%) 显示出更强烈的干旱遗留效应.
结论:
- 干旱恢复在空间上是异质的,受干旱特征和生态系统类型的影响.
- 干旱持续时间是决定恢复时间的重要因素,而不是干旱的强度.
- 将生态系统恢复动态整合到模型中对于准确地进行陆地碳汇估计至关重要.
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