基于SPEI和NDVI的评估框架,用于量化应对气象干旱的植被损失和恢复
Chuanhao Wu1, Lulu Zhong2, Pat J-F Yeh3
1Yangtze Institute for Conservation and Development, Hohai University, Nanjing 210098, China.
The Science of the total environment
|October 8, 2023
概括
使用SPEI和NDVI数据分析了干旱期间的植被损失和恢复动态. 高海拔地区的植被对干旱的敏感性更大,恢复时间更长,森林对干旱的抵抗力更高.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 遥感 遥感 遥感 遥感
背景情况:
- 干旱严重影响植被生长,影响农业和生态管理.
- 了解植被对干旱的反应,包括损失和恢复,对于气候变化适应至关重要.
- 之前的研究探讨了植被与干旱的关系,但损失和恢复的动态仍然不清楚.
研究的目的:
- 开发一个框架来评估植被损失和恢复,以应对气象干旱.
- 将该框架应用于中国南部的珍珠河流域 (PRB).
- 估计干旱引起的植被损失和森林,草原和农田的恢复.
主要方法:
- 使用标准化降雨蒸发透气指数 (SPEI) 进行气象干旱评估.
- 雇员规范差异植被指数 (NDVI) 数据用于监测植被变化.
- 开发了一个评估框架来分析对干旱的反应中的植被损失和恢复动态.
主要成果:
- 在高海拔地区 (延迟时间<3个月) 的植被对干旱的敏感性高于低海拔地区 (延迟时间>8个月).
- 植被丧失,特别是在耕地,对干旱持续时间比严重程度或峰值强度更敏感.
- 干旱通常会导致轻微的植被损失,损失概率和恢复时间的空间变化,特别是在高海拔地区.
结论:
- 森林表现出较高的抗干旱能力,而耕地表现出较低的抗干旱能力;草原的恢复速度比森林 (5.1个月) 和耕地 (4.8个月) 快 (4.2个月).
- 高海拔地区面临更高的可能性 (高达50%),干旱引起的植被损失和更长的恢复期 (>7个月).
- 该研究提供了干旱期间植被动态的见解,这对区域生态和农业管理至关重要.
相关概念视频
Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Applications of GIS: Disaster Management and Emergency Response
91
Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...
91
Adaptations that Reduce Water Loss
25.7K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.7K


