监测植物对中国干旱事件的敏感性
Liangliang Jiang1, Wenli Liu1, Bing Liu2
1School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China; Chongqing Key Laboratory of GIS Application, Chongqing 401331, China.
The Science of the total environment
|June 16, 2023
概括
全球变暖加剧干旱事件,增加植被退化风险. 这项研究量化了干旱对中国各地植被敏感性的影响,确定了有针对性的保护工作的高风险地区.
科学领域:
- 环境科学 环境科学
- 气候变化研究 气候变化研究
- 生态生态学 生态生态学
背景情况:
- 全球变暖正在增加干旱的频率和严重程度,对植被健康构成风险,并导致退化.
- 现有的研究往往忽略了干旱事件,缺乏对中国空间植被对这些事件的敏感性的全面了解.
研究的目的:
- 分析时空干旱模式,量化植被对中国各地干旱事件的敏感性.
- 确定易受植被退化影响的地区,并为保护战略提供信息.
主要方法:
- 运用运行理论来分析各种时间尺度上的干旱事件的时空模式.
- 采用BRT模型来确定干旱特征对植被异常的相对重要性.
- 量化植被异常 (NDVI,现象学) 和干旱指数 (SPEI) 来评估敏感性 (VASD).
主要成果:
- 南新疆和东南中国经历了高干旱严重程度,特别是在3个月和6个月的规模.
- 干旱间隔,强度和严重程度解释了约80%的植被变异;青海-西藏高原和中国东北部显示植被对干旱的敏感性很高.
- 干旱事件通常会延迟生长季节的结束,并延长其长度,特别是对于稀疏的植被.
结论:
- 植物对干旱事件 (VASD) 的敏感性因地区而异,高度敏感的地区作为退化早期预警信号.
- 干旱对植被现象学的影响在干旱和潮湿地区之间有所不同,这对生态系统的弹性有影响.
- 了解VASD对于制定有针对性的策略来防止植被退化至关重要,特别是在生态脆弱的地区.
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