[基于遥感土壤湿度因子的防风和沙子固定功能的估计模型的改进和应用]
Jian Meng1, Hao Sun1, Chao Teng2
1School of Earth Science and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
Ying yong sheng tai xue bao = The journal of applied ecology
|October 28, 2023
概括
遥感改进了风侵蚀模型的土壤湿度估计. 这增强了对宁省风力防治和沙子固定的理解,揭示了土壤类型和风速等关键驱动因素.
科学领域:
- 生态与环境科学 生态与环境科学
- 遥感和地理空间分析
- 土壤科学与水文学
背景情况:
- 准确的土壤湿度估计对于了解生态系统功能,如风和沙子固定至关重要.
- 传统的土壤湿度估计方法在空间连续性和数据可用性方面存在局限性.
- 遥感技术为改善土壤湿度检测提供了潜力.
研究的目的:
- 通过使用遥感数据,改进风侵蚀方程 (RWEQ) 模型中改善土壤湿度因子的估计.
- 从2001年到2021年,分析宁省西北部风力防范和沙子固定服务的时空变化和驱动因素.
- 为长期分析生态功能机制和驱动力提供技术支持.
主要方法:
- 选择并评估了四个土壤湿度的遥感指标:MODIS蒸发透气比率,SMAP土壤湿度比率,可见短波红外干旱指数和遥感湿度指数.
- 通过整合经过验证的基于遥感的土壤湿度估计方法,改进了RWEQ模型.
- 应用了曼-肯德尔趋势测试和地理探测器模型来分析时空趋势和风力预防和沙子固定的驱动因素.
主要成果:
- MODIS蒸发透气比率方法与传统的气象方法计算土壤水分的相关性最高.
- 防风和砂固定能力表现出强大的空间分布,集中在宁省的北部和东部地区.
- 72.7%的研究区域显示,防风和沙子固定能力呈上升趋势.
- 土壤类型,年风速和经济发展水平被确定为主要的驱动因素,因素之间的相互作用比单一因素的影响更大.
结论:
- 远程传感衍生土壤水分的整合显著提高了RWEQ模型的估计能力.
- 遥感方法为评估风力和沙子固定服务的时空动态提供了强大的方法.
- 了解多种驱动因素的相互作用影响对于干旱和半干旱地区的有效生态管理和政策制定至关重要.
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