对玉米田土壤水分的时空变化机制的研究
Lihua Lan1,2,3, Tingting Zhang4,5,6, Baolin Wang7
1Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China.
Scientific reports
|December 27, 2025
概括
土壤水分含量 (SMC) 对农业和气候至关重要. 这项研究显示,土地表面温度和海拔高度在玉米生长期间显著影响SMC,植物指数确定了最佳范围.
科学领域:
- 地球和环境科学 地球和环境科学
- 农业科学 农业科学
- 遥感 遥感 遥感 遥感
背景情况:
- 土壤水分含量 (SMC) 对农业生产力,生态系统健康和气候反至关重要.
- 了解SMC的时空变化对于有效的土地和水资源管理至关重要.
研究的目的:
- 为了研究玉米在关键生长阶段的SMC的时空变化.
- 用先进的遥感和机器学习技术分析环境因素对SMC的影响.
主要方法:
- 一种结合基于物理和数据驱动的方法,集成水云模型和Dubois-Dobson介电检索用于SMC反转.
- 高分辨率的SMC产品生成和分析使用机器学习增强SHAP进行因素影响评估.
主要成果:
- 实现了高精度的SMC反转 (R2=0.75成熟度,R2=0.78填充阶段).
- 土地表面温度 (LST) 和海拔高度被确定为分别在成熟和填充阶段的空间SMC变化的主要驱动因素.
- 随着LST的上升,SMC下降,特别是在15°C以上;确定了SMC保存的最佳NDVI范围 (0.2-0.5).
结论:
- 环境因素,特别是LST和高度,在玉米生长阶段显著推动SMC变化.
- 气象因素在很大程度上决定了SMC水平,而玉米在时间变化中的直接作用是最小的.
- 结果为优化农业实践和增强气候模型提供了关键的见解.
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