研究了中子水分仪校正曲线的各种影响因素,包括土壤类型、质地、容重及土层深度等。当土壤容积含水量为15～45％时,校正曲线近似为一直线,其他因素只改变直线的截距或斜率。土壤中有否植物生长对校正曲线也稍有影响。测量表土层(<20cm)水分时测量误差较大。中子法与取土称重法的相对误差小于8％,但中子法具有不扰动土壤、快速简便及无滞后现象等优点。 Various factors influencing the calibration curve of neutron moisture meter were studied, including soil type, texture, bulk density and soil depth. When the soil volumetric moisture content is 15-45%, the calibration curve is approximately a straight line, other factors only change the intercept or slope of the straight line. Whether or not plant growth in the soil has a slight effect on the calibration curve. Measuring surface soil (<20cm) water measurement error when larger. The relative error between neutron method and earth-boring method is less than 8%, but the neutron method has the advantages of not disturbing the soil, quick and easy, and no hysteresis.