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在总结文献和室内外试验基础上，对排水条件下氮素运移、转化及流失规律进行了分析研究；建立了一维、二维土壤水和地下水中氮素运移转化数学模型；探索了有限元数值计算法耦合求解水流和氮素运移模型，并提出了改进流线追踪法，克服了已有简易计算方法中采用经验数据，精确方法计算繁复，且耗机时多的缺点，可用于排水农田氮素运移长期预报。
On the basis of summarizing the literature and indoor and outdoor experiments, the rules of nitrogen transport, transformation and loss under drainage conditions were analyzed and studied. The mathematical model of nitrogen transport and transformation in one-dimensional and two-dimensional soil water and groundwater was established. Meta-numerical method is used to solve the model of water flow and nitrogen transport, and an improved streamline tracing method is proposed to overcome the shortcomings of using experiential data in the simple calculation method and complicated calculation with more accurate method, which can be used in Long - term prediction of nitrogen transport in drained farmland.