利用微波辐射计对土壤湿度动态的反演研究

Dynamic Characteristic Study on Soil Moisture with L-Band Microwave Radiometer

在实验室条件下,利用L频段微波辐射计测量了土壤湿度动态特性。结果表明:在注水1,2 h,土壤湿度随土壤深度呈3次多项式关系变化,可以根据浅层土壤信息反演深层土壤湿度。但随着注水时间的增加,土层深度与土壤湿度间的规律性不明显。因此,需要在更加精确设计室内试验的同时,进行大量的野外观测以完善这一理论。

Dynamic characteristics of soil moisture were tested with L-band microwave radiometer. The results show that after one and two hour irrigation, soil moisture is a three order polynomial of the soil depth. Soil moisture in deep layers can be got from the top-layer results according to this relationship. But with the increase of depth, the relationship between soil moisture and depth is not obvious. To perfect this theory, we need to design more precise indoor experiments and to conduct plenty of field observations.