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以黄淮海平原封丘地区的潮土和风沙土为研究对象 ,试图寻求解决土壤水动力学特性参数问题的更加实用可行的方法。根据大量的土壤基本物理性质和土壤持水数据 ,利用多元逐步回归分析方法 ,分别建立了vanGenuchten模型的参数θr、θs、a、n的土壤传递函数模型 ,并通过统计分析和数学模拟进行模型验证。研究结果表明 ,vanGenuchten模型参数与土壤的质地、有机质含量及容重等基本物理性质有一定的线性相关性。vanGenuchten模型的参数估计模型对粘性土壤的拟合效果较好 ,而拟合砂性土壤时误差较大。
Taking the tidal and aeolian sandy soil in Fengqiu area of Huang-Huai-Hai Plain as the research object, this paper attempts to seek a more practical and feasible method to solve the problem of soil hydrodynamic characteristic parameters. According to a great deal of basic physical properties of soil and soil water retention data, the soil transfer function models of parameters θr, θs, a, n of vanGenuchten model were established respectively by multiple stepwise regression analysis and verified by statistical analysis and mathematical simulation . The results show that the vanGenuchten model parameters have some linear correlation with the basic physical properties such as soil texture, organic matter content and bulk density. The parameter estimation model of vanGenuchten model fits well to the cohesive soil, but the error is larger when fitting the sandy soil.