应用时域反射仪测定农田土壤水分

Measurement of Field Soil Water by Using Time Domain Reflectometry

介绍了时域反射仪（ＴＤＲ）测定农田土壤水分的方法及其应用，包括测定农田根系层土壤含水量和一定深度范围内土体贮水量，ＴＤＲ自动、连续监测土壤水分，用ＴＤＲ实测土壤水分来估算作物不同生长发育期内农田实际蒸散量以及用于探讨农田水分空间变异性。还对ＴＤＲ、中子仪和土钻法测定的土壤含水量进行了比较，结果表明，应用ＴＤＲ测定农田土壤水分要优于中子仪和土钻法。

A techique to measure the field soil water by using Time Domain Reflectometry (TDR) and its applications are introduced in this paper, including determing soil water content in the root zone and soil water storage for the soil profile; automatic and continuous monitoring soil moisture. The measured soil water can be used to estimate evapotranspiration in the crop growth season and to evaluate the spatial variability of soil moisture in the field. The three methods of TDR, neutron probe and soil sampling are compared in measuring soil water content. The results showed that the TDR is superior to the other two methods for measuring the field soil water.