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在过去的四十年中,中国的植被绿化和土壤水分之间的双向依赖性发生了变化
Zhihui Yang1, Jie Gong1, Shimei Wang1
1Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
The Science of the total environment
|August 19, 2023
概括
土壤湿度和NDVI在中国各地显示出显著的合关系. 生态恢复项目越来越多地导致土壤水分和植被绿色的同时增加,特别是在2011年以来.
科学领域:
- 地球和环境科学 地球和环境科学
- 气候科学 气候科学
- 生态生态学 生态生态学
背景情况:
- 土壤湿度 (SM) 和正常差异植被指数 (NDVI) 在过去的40年中在中国出现了显著的变化.
- 在NDVI的剧烈变化加剧了植被生长和水资源的可用性之间的区域冲突.
- 了解SM和NDVI之间的双向依赖对于平衡陆地植被和水资源至关重要.
研究的目的:
- 量化中国土壤湿度和NDVI之间的时空双向依赖性和相互反.
- 分析SM和NDVI在不同地区和时间段之间的合模式和趋势.
- 调查生态恢复项目的对SM-NDVI关系的影响.
主要方法:
- 用格兰杰因果关系测试来确定SM和NDVI之间的关系的方向性.
- 使用趋势合分析和波形变换来揭示时空合模式.
- 应用了滞后相关性分析,以确定SM-NDVI关系中的时间滞后效应.
主要成果:
- 在中国大部分地区发现了SM和NDVI之间显著的合关系,58%的单向格兰杰效应从SM到NDVI,26%的NDVI到SM,16%的双向.
- 在SM-NDVI合中观察到空间异质性,SM和NDVI在36%的区域一起增加,SM在NDVI下降时增加12%,SM在NDVI上升时减少27%.
- 自2011年以来,这种关系出现了逆转,与生态恢复项目相关的NDVI和SM的显著同步增长趋势,表现出1-3个月的时间滞后,特别是在中国南部的深层土壤层.
结论:
- 该研究建立了中国土壤水分和植被绿化之间的合框架和反分析.
- 调查结果强调了生态恢复项目对加强SM-NDVI关系的重大影响.
- 该研究为生态恢复的科学实施和生态系统碳和水循环的管理提供了宝贵的见解.
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