密集的植被作为自然缓冲:缓解和减缓干旱的传播速度
Linying Xiao1, Changqing Guo2, Chenghao Zheng1
1School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China; Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China; Yunnan Jianshui Desert Ecosystem National Positioning Research Station, Jianshui, Yunnan, 654399, China.
Journal of environmental management
|June 5, 2025
概括
增加植被减缓了干旱的传播,因为它改善了土壤的保留水. 中国西南地区增强的植被覆盖面减轻了干旱风险,突出了植树和土地管理的重要性.
科学领域:
- 水文学的水文学
- 环境科学 环境科学
- 生态生态学 生态生态学
背景情况:
- 有效的干旱管理需要了解干旱的传播,特别是随着植被覆盖面的增加.
- 土壤干旱的动态受气象因素和植被的影响.
- 中国西南部的红河流域 (RRB) 面临着日益严重的植被和干旱挑战.
研究的目的:
- 调查RRB的气象和土壤干旱之间的关系.
- 量化干旱传播指标并确定关键驱动因素.
- 评估植被对干旱传播动态的影响.
主要方法:
- 使用了每月标准化降水蒸发指数 (SPEI) 和土壤湿度指数 (SMI) 数据 (2000-2021).
- 开发了一种新的峰值回溯方法来计算传播时间 (PT),触发值 (TR) 和传播速率 (PR).
- 应用格兰杰因果分析来确定干旱驱动因素.
主要成果:
- 在RRB的平均干旱传播率为64.64%,平均PT为3.3个月,TR为-0.72.
- 植被因素,特别是NDVI,是主要的驱动因素,超过了NPP.
- 增强的植被覆盖面 (NDVI > 0.419/0.514) 减缓了13%的繁殖速度,并增加了0.34个月的PT,将土壤水分与气象干旱脱.
结论:
- 植被恢复可以提高土壤的水和多孔性,减轻干旱的蔓延.
- 造林和可持续的土地管理对于减少生态敏感地区干旱风险至关重要.
- 增加的植被覆盖面显著改变了干旱传播特征,为干旱抵御能力提供了途径.
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