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利用离心机法测定了0～20cm、20～40cm原状土柱和均质土柱(扰动土)的土壤水分特征曲线,并用VanGenuchten模型对所测得的数据进行拟合得到拟合参数,对比了含有大孔隙的原状土柱和不含大孔隙的均质土柱的土壤水分特征曲线,分析说明了原状土柱中大孔隙对土壤水分特征曲线形状及其拟合参数以及田间持水量和凋萎系数等水分常数的影响,指出了用均质土测得的土壤水分特征曲线指导农田灌溉时需要注意的问题。
The soil moisture characteristics of 0 ~ 20cm, 20 ~ 40cm undisturbed soil column and homogeneous soil column (disturbed soil) were determined by centrifuge method. The fitted parameters were obtained by fitting the measured data with VanGenuchten model. The soil moisture characteristic curves of macropores with intact macropores and those of homogeneous soil columns without macropores indicate that the macropores in undisturbed soil columns can affect the shape of soil moisture and its fitting parameters as well as the field capacity and wilt Coefficient and other moisture constants, we point out the problems that need attention in guiding the irrigation of farmland with the soil moisture characteristic curve measured by homogeneous soil.