用表观热惯量法计算土壤含水量探讨

在分析应用遥感资料监测土壤水分的方法及其可行性的基础上,介绍了表观热惯量法监测土壤水分的基本原理和具体实施步骤.通过实测资料的验证表明,此种方法在0～20cm的土层内具有较高的精度,而在30cm以下的深度应用此法其精度有所降低.同传统的水分监测方法相比,表观热惯量法监测土壤水分具有方便、快捷、多时相等特点;同其他遥感方法相比,该方法应用简单,成本低,无需过多的气象数据支持即可完成对大面积土壤水分变化的监测,但仅适用于裸土或低植被覆盖的条件.

Monitoring of Soil Moisture by Apparent Thermal Inertia Method

Based on the analysis of feasibility applying remote sensing methods to monitor soil moisture,the basic theories and particular implement processes monitoring soil moisture were introduced by Apparent Thermal Inertia Method(ATIM).The calculation and validation showed that the method had a relative high precision within 20cm soil depth,while the precision decreased beyond 30cm soil depth.It was convenient,shortcut and multi-time and interface compared with the traditional soil moisture monitoring methods by using ATIM.Compared with other remote sensing methods,the implement of ATIM was easy and needed less cost,in particular,didn't need a lot of meteorology data by monitoring soil moisture at large scale of areas.However,ATIM only adapted to soil moisture monitoring for bare soil or low vegetation covered soil.