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当今农业地区施肥引起氮素对地下水的污染已成为人们十分关注的一个环境问题.在长期田间观测实验的基础上,应用LEACHM数学模型,对唐山农业地区在灌溉施肥条件下氮素在土壤中的迁移转化,尤其是对根区以下硝态氮的渗漏损失及其影响因素进行了分析研究.研究结果表明,农业地区灌溉施肥过程中氮素的深层渗漏损失是造成浅层地下水中硝态氮积累的一个重要的来源.应采取科学的田间管理方法,减少氮素的深层损失,以保护地下水免受污染.
Fertilization in today’s agricultural areas has caused nitrogen pollution of groundwater has become a very concerned about the environment. On the basis of long-term field experiments, the LEACHM mathematical model was applied to study the migration and transformation of nitrogen in soil under irrigation and fertilization conditions in Tangshan agricultural area, especially the leakage loss of nitrate nitrogen under the root zone and its influencing factors Analytical research. The results show that the deep leakage loss of nitrogen in irrigation and fertilization in agricultural areas is an important source of nitrate accumulation in shallow groundwater. Scientific field management should be adopted to reduce the deep loss of nitrogen to protect groundwater from pollution.