干旱地植被对春季洪水的反应的两极化
Shouguo Zhang1, Han Wang1, Xiwen Zhang2
1Key Laboratory for Urban Habitat Environmental Science and Technology, School of Urban Planning and Design, Peking University, Shenzhen, 518055, PR China; Key Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, PR China.
Journal of environmental management
|June 25, 2025
概括
干旱地植被对洪水表现出两极分化的反应,观察到显著的正负增长变化. 气候因素决定了这些极端的植被变化是否发生,影响了生态系统的稳定性.
科学领域:
- 生态生态学 生态生态学
- 遥感 遥感 遥感 遥感
- 气候科学 气候科学
背景情况:
- 干旱地植被在全球范围内至关重要,对水资源的可用性敏感.
- 越来越严重的洪水对旱地生态系统构成风险.
- 人们对植被两极化 (极端的积极/负面反应) 对洪水的现象了解得很少.
研究的目的:
- 研究中亚春季洪水对两极分化的植被反应的特征和驱动因素.
- 开发和应用新的指数来量化植被两极分化.
- 利用可解释的机器学习来识别关键的影响因素.
主要方法:
- 使用卫星遥感开发植物反应指数 (VRI) 和极化指数 (PI).
- 可解释机器学习的应用,以分析植被两极化驱动因素.
- 使用多种植被指数 (EVI,LAI) 和极化指标进行验证.
主要成果:
- 与未受洪水影响的地区相比,受洪水影响的地区显示出明显更强的正面 (28.6%) 和负面 (25.8%) 植被反应.
- 两极化现象在不同的指数和指标中得到了一致的验证.
- 气候因素被确定为植被两极分化的首要决定因素,可解释的模型达到高准确度 (88.8%为阳性,90.2%为负).
结论:
- 干旱地区的植被表现出明显的极化现象,以应对春季洪水.
- 气候因素通过交叉,门和范围效应作用,决定了植被两极化的发生和性质.
- 了解这些两极分化的反应对于预测和管理干地生态系统对洪水的脆弱性至关重要.
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