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膜孔入渗是指在覆膜灌溉中，水通过膜孔渗入土壤的过程．作者对陕北榆林壤土进行了５种膜孔直径的单点膜孔入渗室内试验，观测并分析了累计入渗量、湿润深度及表面湿润半径随入渗历时的变化规律．结果表明：①单点膜孔的累积入渗量变化过程符合Ｋｏｓｔｉａｋｏｖ模型；②相对入渗参数（单点膜孔入渗参数与垂直一维入渗参数之比值）与膜孔直径具有显著的相关关系；③单点膜孔的湿润深度小于垂直一维入渗的湿润深度，并且相对湿润深度（单点膜孔的湿润深度与垂直一维入渗的湿润深度之比值）与膜孔直径具有显著的相关关系；④单点膜孔入渗的表面湿润半径与入渗历时符合幂函数关系，并与膜孔直径存在着显著的相关关系；⑤在相同入渗历时的情况下，与垂直一维入渗相比，膜孔入渗的湿润土体平均含水率较小．
Membrane pore infiltration refers to the process of infiltration of water through the membrane pores into the soil during film irrigation. In this paper, five kinds of single-hole pore infiltration experiments were carried out on Yulin loam in northern Shaanxi. The cumulative infiltration rate, wetting depth and surface wetting radius were observed and analyzed. The results show that: (1) The variation of cumulative infiltration rate of single-point membrane pores conforms to the Kostiakov model. (2) The relative infiltration parameters (the ratio of single-point pore infiltration parameters to vertical one-dimensional infiltration parameters) (3) The wetting depth of single-point membrane pores is less than the vertical depth of one-dimensional infiltration, and the relative humidity depth (the ratio of the wetting depth of single-point membrane pores to the vertical wetting depth of one-dimensional infiltration) ; ④ The surface wetting radius of infiltration of single-point membrane infiltrated the power function relationship with the duration of infiltration, and there was a significant correlation with membrane pore diameter; ⑤ In the same infiltration duration, Compared with the infiltration, the average water content of wet soil infiltration is smaller.