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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
Soil NH4 + and NO3- are regarded as soil solutes. According to the principle of soil solute transport, a convection-dispersion model describing soil solute transport is used to establish a numerical simulation model of soil nitrogen transport under field conditions. Transformation, bio-activity-release, soil ammonia volatilization, nitrification and denitrification. Linear models were also used to describe soil ammonium adsorption and crop root absorption was also included in the source and sink section. All transformation parameters need to be amended with soil temperature and humidity. The model is a soil water, heat and nitrogen combined simulation model. The water and salt movement module in the joint model was tested with the classical test