硝态氮在紫色土和石灰土中淋溶过程模拟研究

Simulation Research of Nitrate-N Leaching Process in Purple Soil and Lime Soil

为了研究硝态氮的淋溶规律,根据室内土柱淋溶试验的具体条件提出假设,基于Matlab开发了一个简易模型,考虑了NO-3-N在土壤中的硝化、反硝化、生物固持等生化过程和物理迁移过程,同时给出了模型关键参数的获取方法。模型通过了室内土柱淋溶试验的验证,能够较好地反映NO-3-N在稳定流场、饱和均质土壤中的迁移转化过程。可以作为研究土壤中硝态氮运移规律的工具,为农业面源污染治理提供科学依据。

Nitrate leaching in soil is one of the main causes of agricultural non-point source pollution.In order to study the law of nitrate leaching,a simple mathematic model was developed based on Matlab software,which considered the specific conditions of laboratory soil column leaching experiments and the migration processes of nitrification,denitrification,biological fixation,etc.At the same time,the method of acquiring the key parameters was given.The model was verified by laboratory experiments of soil column leaching,and the variation process of nitrate-N in stationary flow field and saturated homogeneous soil was well described.This model can be used to study the law of nitrate nitrogen leaching in soil,and provide a scientific basis for agricultural non-point source pollution control.