中文摘要：

运用多孔介质“七场-相变-扩散”模型（简称七场模型），结合多孔介质溶质运移理论，建立了土壤热、湿、气及盐分耦合运移的数学模型．与一般研究溶质运移的模型不同，计算模型中所涉及的变量均在模型内求解，使模型具有较好的封闭性和相对的独立性．通过数值模拟研究了土壤中的盐分上升过程。结果表明模拟盐分上升趋势与实验结果一致，但模拟精度仍有待提高．

英文摘要：

Mathematical model of ＂seven field-phase change-diffusion＂ （seven field model） of porous media was considered. Combined with the theory of solute transfer in porous media, a new coupling mathematical model of heat, moisture, gas and. solute transfer in soil is established. Different from previous mathematical model of solute transfer, then new model is improved to be more independent. All the variables used in the new model can be solved in the conpled equations. The salt development in soil was simulated with this model and the simulation results show the same tendency as the results of the former experiments but with a less precision. Many researches should be done to improve the model and the parameters used in this model should be measured.