Nitrate content in ground water accumulates obviously with the increase of N-fertilizer applied, so the potential pollution should not be ignored.
随着施N时间的推移和施用量的增加，地下水中硝态氮具有明显的积累趋势，潜在污染不容忽视；
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.
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。
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.
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。
Agricultural non-point source pollution was take up 57%> 43% of total N&P pollution loading in Dasong river watershed respectively.
大嵩江流域非点源总氮、总磷污染负荷占整个流域污染负荷的57％、43％。
The results shown that the water quality in Red Tide-monitoring Area was on situation of serious super-nutrition and organic pollution and on state of high N and low P;
分析结果表明：在赤潮多发期，监控区水质有机污染程度和富营养化状态较严重，明显呈低P高N状态；
Useing of Dongting Lake hydrological observation stations, environmental monitoring data and on-the-spot investigation, Analysising of the Dongting Lake wetland on the N, P pollution-purification.
利用洞庭湖水文观测站、环境监测站和实地考察资料，分析了洞庭湖湿地对氮（N）、磷（P）污染的净化功能。
Pollution loading of dissolved N and P in ChaoHu lake watershed could be evaluated through export model of N and P after annual runoff volume was work out according to SCS model.
流域溶解态N、P污染负荷估算是由SCS模型得到流域年径流量，然后由溶解态N、P输出模型计算得出。
Study on transfer and transformation of NH3-N from leachate in soil and groundwater was carried out by simulated experiment, influence extent and law of leachate pollution on soil were achieved.
通过模拟实验对渗滤液中的氨氮在土壤和地下水中的迁移转化进行了研究，从而得出渗滤液对土壤的影响程度和规律。
Study on transfer and transformation of NH3-N from leachate in soil and groundwater was carried out by simulated experiment, influence extent and law of leachate pollution on soil were achieved.
通过模拟实验对渗滤液中的氨氮在土壤和地下水中的迁移转化进行了研究，从而得出渗滤液对土壤的影响程度和规律。
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