非稳定流条件下非饱和均质土壤溶质运移的传递函数解

根据溶质运移的传递函数模型Tromsfer Function Model, TFM理论，研究了非稳定流条件下非饱和均质土壤中表施和原有NO-3 N及原有Cl-的运移。由极大似然法估算了模型参数μ和σ2，求出了溶质运移的概率密度函数，计算了NO-3 -N的淋失量，并利用土壤中原有Cl-的动态，对NO-3 N的迁移过程进行了模拟，同时还估算了溶质的中值迁移时间tm和均值迁移时间相应的运移体积θst和θst。

Transfer function approach of solute transport in unsaturated homogeneous soil under unsteady flow condition

Based on the theory of transfer function model, the transport of surface-applied and indigenous nitrate and chloride in unsaturated homogeneous soil under unsteady condition is investigated experimentally. The mean and variance of log-normal distribution probability density function (pdf) of the travel time are evalutated by the maximum likelihood method, and then the quantity of leached nitrate-nitrogen is determined accordingly. The process of nitrogen leaching is predicted using the transport of the indigenous chloride in soil. The median travel time and mean travel time as well as the transport volume are also estimated.