【摘要】 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。更多还原

【Abstract】 With the centrifugal method, the soil water characteristic curve (SWCC) of the undisturbed and packed soil columns of 0-20 cm and 20-40 cm were measured in this paper. And the calibration parameters were obtained from the Van Genuchten model. It was compared that water characteristic curves between undisturbed soil column with macropore and packed soil column without macropore. The comparative results showed the influence of the macropore of the undisturbed soil column on water characteristic curves and their calibration parameters, field capacity, and wilting coefficient. Besides, the points of attention were stated when the SWCC of the packed soil was applied to guide the irrigation.更多还原