突发干旱加剧了全球植被丧失,并延迟了恢复
Yuanfang Chai1,2, Chiyuan Miao3, Amir AghaKouchak4
1State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction, Faculty of Geographical Science, Beijing Normal University, Beijing, China.
Nature communications
|December 7, 2025
概括
快速干旱正在导致全球显著的植被丧失,对生态系统和农业的影响比传统干旱更严重. 恢复时间正在增加,特别是在森林中,这表明生态后果正在恶化.
科学领域:
- 地球和环境科学 地球和环境科学
- 气候科学 气候科学
- 生态生态学 生态生态学
背景情况:
- 在全球范围内,突然的干旱正在增加,对农业,生态系统和水资源构成重大威胁.
- 在这些事件期间量化植被损失对于理解它们的影响至关重要.
研究的目的:
- 开发一种改进的方法来量化干旱造成的全球植被损失.
- 为了比较突然干旱和传统干旱造成的植被损失.
- 分析突发干旱频率的趋势及其对植被恢复的影响.
主要方法:
- 利用规范差异植被指数 (NDVI) 来推导植被损失指标.
- 分析了1982年至2020年全球植被数据.
- 经过快速干旱事件后的量化NDVI损失和恢复时间.
主要成果:
- 快速干旱期间的NDVI损失 (9.0%) 是传统干旱 (5.3%) 的1.5倍.
- 由于突发干旱导致的全球NDVI损失出现了每十年1.8%的显著上升趋势,这是由于事件频率增加 (81.2%的趋势) 而导致的.
- 从1982年到2020年,NDVI恢复时间每年增加0.4,特别是在热带和温带森林.
结论:
- 快速干旱是全球植被丧失的主要驱动因素,其影响超过了传统干旱的影响.
- 快速干旱的频率和强度日益增加,导致植被恢复时间延长,特别是在关键森林生态系统中.
- 这些发现强调,迫切需要解决不断升级的突发干旱事件对生态的影响.
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