TDR和FDR测定黄绵土土壤含水量的标定

Determination Soil Water Content Using TDR and FDR in the Loess Plateau

时域反射仪(TDR)与频率反射仪(FDR)是目前最为先进,并且最具有发展前途的土壤含水量测量仪器。有便利、快捷、准确的优点。介绍了6种基于TDR或FDR原理的仪器对黄绵土含水量进行试验标定的方法与结果。标定结果表明:仪器的测量值与烘干法的测量值之间有一定的差异,CS616和Trime-T3烘干法测定结果接近,但是其余的4种仪器测定值均高于烘干法测定值,在应用这些仪器测定土壤含水量时需要进行标定。

Time Domain Reflectometry （TDR） device and Frequency Domain Reflectometry （FDR） device are the most advanced and most promising soil moisture content measurement equipments, which having convenient, fast and accurate advantages. Six sensors were used to measure the water content of cultivated loessial soil. Calibration for the measurement was done, and the result showed that the differences were found between soil water content measured by sensors and oven drying methods. Therefore, the sensors of TDR and FDR should be recalibrated in different soils before application.