基于多重权重方法的植被干旱风险评估在中国西北地区
Huixia Chen1, Qianfeng Wang2, Virgílio A Bento3
1The Academy of Digital China (Fujian)/College of Environmental & Safety Engineering, Fuzhou University, Fuzhou, 350116, China.
Environmental monitoring and assessment
|September 5, 2023
概括
中国西北部的植被干旱风险正在增加,特别是在西部和特定地区,如青海南部和新疆西北部. 这项研究为植物保护和干旱管理提供了定量工具.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 遥感 遥感 遥感 遥感
背景情况:
- 植被对生态系统稳定至关重要,反映了陆地健康状况.
- 由于干旱的复杂性和不可预测性,干旱会对植被生长产生重大影响.
- 由于复杂的植被-干旱合机制,对植被干旱风险的研究有限.
研究的目的:
- 量化评估中国西北地区的植被干旱风险.
- 开发一个强大的植被干旱风险评估模型.
- 为植被保护和干旱管理战略提供基础.
主要方法:
- 使用了改进的植被健康指数 (VHI) 和多源数据.
- 根据危险和脆弱性评估选择的指标因素.
- 采用了三种不同的权重方法 (,批评,变化系数) 来构建索引模型.
主要成果:
- 在1981年至2020年期间,中国西北部广泛地区的植被干旱情况恶化.
- 三种权重方法的风险评估在很大程度上是一致的,对于特定的植被类型有很小的差异.
- 观察到西部干旱风险较高,东部风险较低的空间模式,青海南部和新疆西北部风险较高.
结论:
- 中国西北地区的植被干旱风险普遍增加,区域差异很大.
- 开发的模型为了解和管理植被干旱提供了可靠的定量基础.
- 调查结果突出了需要有针对性的保护和管理努力以减轻干旱影响的关键领域.
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