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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 reflectometer (TDR) and frequency reflectometer (FDR) is the most advanced and most promising soil moisture measurement instruments. A convenient, fast and accurate advantages. Six methods and results of experimental calibration of water content of loessial soils based on TDR or FDR principle are introduced. Calibration results show that there is a certain difference between the measured value of the instrument and the measured value of the drying method. The results of the determination of the drying method of the CS616 and the Trime-T3 are similar, but the values of the other four instruments are higher than those measured by the drying method , Calibration is required when applying these instruments to determine soil moisture content.