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利用多种TDR仪器测试不同盐分质量浓度条件下的含水率,与烘干法测得的结果进行比较,探讨了土壤盐分对各种TDR仪器的测量精度的影响。针对TDR100仪器,采用多种探头,分析不同长度、不同间距的探针对测试结果的影响。结果表明,所选5种仪器测试结果均受盐分影响,随盐分质量浓度的增加,测得的含水率值增大或是无法得出合理数值。TDR100所用探头,其探针越长、间距越宽受盐分影响越大。在含盐率较低的土体中,各仪器测试结果与烘干法测量结果变化趋势基本一致,可采用线性函数进行标定,R2均在0.94以上。试验结果可为野外试验的选点、测试和含水率校正提供参考。
The effect of soil salinity on the measurement accuracy of various TDR instruments was discussed by using various TDR instruments to test the moisture content under different salt concentration conditions and comparing with the drying method. For TDR100 instruments, a variety of probes are used to analyze the effects of probes of different lengths and pitches on test results. The results showed that the results of the five instruments tested were affected by the salt content. As the salt concentration increased, the measured value of water content increased or could not be obtained reasonable value. TDR100 probe used, the longer the probe, the wider the greater the impact of salt. In the soil with lower salinity rate, the trend of the measurement results of each instrument is basically the same as that of the drying method, and can be calibrated with a linear function, all of which are above 0.94. The test results can provide references for field test, test and water content correction.