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为了探讨在盐渍化土壤中时域反射仪(Time Domian Refractometer,TDR)和时域传输仪(Time domain transmission,TDT)测定土壤含水量的精度,通过室内模拟试验,对盐渍化土壤在不同容重和含盐量水平下的土壤含水量进行标定分析。结果表明,在不同容重条件下TDR和TDT的土壤含水量测定结果与烘干法测定的结果均达到极显著水平。土壤含盐量在2 g kg-1时TDR和TDT的测定结果与实际烘干测定的结果相一致,达到极显著水平。土壤含盐量在12 g kg-1时TDR出现读数消失的情况,TDT能够正常读数,并达到极显著水平。因此,低于12 g kg-1的盐渍化土壤中TDT可以测定实际土壤含水量。
In order to investigate the accuracy of soil moisture measurement by Time Domian Refractometer (TDR) and Time Domain Transmission (TDT) in salinized soils, Gravimetric and salinity levels of soil moisture were calibrated. The results show that the soil moisture content of TDR and TDT under different conditions of bulk density and the drying method to determine the results were reached a significant level. The measured results of TDR and TDT at the soil salinity of 2 g kg-1 are in agreement with the results of the actual drying test, reaching an extremely significant level. When the soil salinity was 12 g kg-1, the readings of TDR disappeared. The TDT was able to read normally and reached the extremely significant level. Therefore, TDT in salinized soils below 12 g kg -1 can determine the actual soil moisture content.