相反的反机制促使盆地规模的植被对寒冷干旱的中国北部干旱的脆弱性
Jianguo Ji1, Yixuan Wang2, Tingxi Liu2
1State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Inner Mongolia Agricultural University, Hohhot, 010018, China; College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, 010018, China.
Journal of environmental management
|February 12, 2026
概括
中国北部的干旱情况正在恶化,影响脆弱的生态系统. 这项研究开发了一个评估植被脆弱性的新框架,揭示了由于不同反机制,东部和西部盆地对干旱的反应不同.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 中国北部寒冷干旱地区是面临全球变暖导致干旱风险增加的重要生态障碍.
- 现有的评估植被对干旱脆弱性的方法受到静态假设的限制,这阻碍了脆弱生态系统的准确分析.
研究的目的:
- 建立一个盆地规模的框架来评估中国北部植被对干旱的脆弱性.
- 系统量化植被的抗性,弹性和脆弱性,以及关键干旱值.
- 分析干旱影响的空间差异化以及潜在的反机制.
主要方法:
- 使用了标准化的降雨蒸发透气指数 (SPEI) 和复合植被指数 (CVI).
- 开发了一个盆地规模的框架,以评估五个代表盆地的植被脆弱性.
- 量化植被的抗性,弹性,脆弱性和干旱严重程度/持续时间的值.
主要成果:
- 干旱的严重程度和持续时间从东到西增加,而峰值强度则下降.
- 东部的植被异常与更短,更强烈的干旱相关;西部的异常与更长,更温和的干旱相关.
- 植被的抗性和弹性呈现出从东到西的下降,然后增加的趋势,影响了脆弱性水平.
- 干旱门在空间上有所不同,在东部更高,在西部更低.
- 相反的反机制 (东部为负,西部为正) 推动干旱影响的空间差异化.
结论:
- 中国北部植物对干旱的脆弱性表现出显著的空间异质性.
- 反机制在确定不同盆地的植被对干旱的反应和弹性方面发挥着至关重要的作用.
- 开发的框架提供了一种更精确的方法来评估气候变化下的寒冷干旱生态系统中的植被脆弱性.
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