考虑残留氮对非稳定流场硝态氮淋失贡献的传递函数模型Ⅰ.地中渗透计验证

本文通过引入溶质迁移距离的概率密度函数的修正系数，将Jury等提出的模拟非稳定流条件下土壤保守溶质运移的传递函数模型理论扩展到考虑土壤剖面存在残留氮分布的土壤中，构造了一个能估算表施和残留氮对土壤硝态氮淋失动态贡献的传递函数模型。通过与野外地中渗透计实验资料的对比，表明该模型具有一定的仿真精度，模拟的土壤硝态氮累积淋失量的相对误差小于15％。

Transfer function model for simulating nitrate leaching in soil from applied and indigenous nitrate in transient flow Ⅰ.lysimeter test

An improved transfer function model was developed to simulate the nitrate flux concentration under the condition of initial concentration of nitrate in soil profile was non-uniform. The infiltration-redistribution experiment was conducted in the non-weighting lysimeters and the parameters of cumulative drainage probability density function were obtained using the moment method. By introducing the modified factor of probability density function, the new transfer function model could identify the contribution of indigenous and applied nitrate to the nitrate leaching in soil. The outflow concentration of nitrate was treated as the response of resident nitrate flux concentration and that of applied nitrate flux concentration, and a good agreement between measured and simulated data were obtained. The relative error of simulated cumulative leached quantity of nitrate is less than 15%.