唐山市农业区地下水垂向剖面中硝态氮污染的研究

Study on the nitrate-N pollution in the groundwater vertical profile in Tangshan agricultural area

当今农业地区灌溉施肥引起氮素对地下水的污染已成为人们普遍关注的环境问题.本文结合唐山市农业区的生产实际，应用LEACHN数学模型，对唐山市农业地区灌溉施肥条件下氮素在土壤中的迁移转化进行了模拟计算.所建立的地下水垂向剖面的二维水量水质模型，对典型剖面中地下水的硝态氮污染进行了模拟和分析.计算结果表明，唐山农业区灌溉施肥引起根区以下硝态氮渗漏损失可造成浅层地下水的污染.

At present, nitrogen pollution in the groundwater caused by fertilizer irrigation in the agricultural area has become an environmental problem of interest to the people. LEACHN mathematical model is used to simulate the transport and transform of nitrogen in the soil under fertilizer irrigation condition with the production practice of agricultural area in Tangshan City. Two-dimension groundwater quantity and quality model in the vertical profile is made to carry out the simulation and analysis of nitrate-N pollution of the groundwater in the typical profile. The results indicate that the nitrate-N leakage loss under the root zone caused by fertilizer irrigation could creat the pollution of shallow groundwater in Tangshan agricultural area.