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采用田间标定方法,研究了三江平原草甸白浆土土壤水分的定标问题,并对影响定标准确性的因素进行了分析与探讨。结果表明, 25~100cm土层定标直线的相关程度较好,相关系数可达0 85;影响土壤定标准确性的因素包括土壤剖面质地的均匀性、植物根系密度、土壤有机质含量、冻层及土壤剖面含水量差异等。对20cm以上的土壤表层,因中子外溢造成的误差,应以烘干法为主进行土壤水分动态观测。
The field calibration method was used to study the calibration of soil moisture in the meadow alpine meadow soil in Sanjiang Plain. The factors affecting the calibration accuracy were analyzed and discussed. The results showed that the correlativity between calibration curve of 25 ~ 100cm soil layer was good, and the correlation coefficient was up to 0 85. The factors influencing the accuracy of soil calibration included soil texture uniformity, plant root density, soil organic matter content, And soil profile water content differences. For the soil surface above 20cm, due to the error caused by the neutron spillover, the soil moisture dynamic observation should be mainly based on the drying method.