【摘要】 将土壤ＮＨ４＋和ＮＯ３－视为土壤溶质，根据土壤溶质运移原理，选用描述土壤溶质运移的对流－弥散模型，建立了一个田间条件下土壤氮素运移的数值模拟模型模型中考虑了矿化、生物因持－释放、土壤氨挥发、硝化和反硝化等转化作用，并用线性模式描述土壤铵吸附，作物根系吸收也在源汇项中．各转化参数均需用土壤温度和湿度进行修正，所建模型为土壤水、热和氮素联合模拟模型．对联合模型中水盐运动模块用经典试验作了检验更多还原

【Abstract】 Based on the principle of transport the convective-dispersive model is utilized to establish a numerical model for soil nitrogen transport in field. In the model the NH4+ and NO3- are refered as soil solute, NH4+ absorpted by soil is dealed with linear model, and the processes of crop nitrogen uptake, bio-immobilization-release nitrification as well as denitricication are also to be considered. The coefficients of soil nitrogen tranform and transport are modified according to the soil moisture and soil temperature. The soil water and solute simulation model was verified by Warrick’s experimental data.更多还原