氮素流入对水域的污染为非点源污染，主要导致地表水的富营养化、地下水硝酸盐含量过高等。
Nitrogen may cause non_point pollution in water in forms of eutrophication in surface waters and high nitrate concentration in ground water.
底层土壤的反硝化作用是土壤排放N_2O的重要来源，同时也是影响浅层地下水硝酸盐含量的重要因素。
Denitrification in subsurface is the important source of N2O emission from soil. It is also a key factor of affecting NO3 content of shallow groundwater.
地下水中的微量元素含量远远超过了其它地下水污染物——如硝酸盐、杀虫剂和挥发性化合物(VOCs)中的含量标准。
Trace elements in groundwater exceed human health benchmarks at a rate that far outpaces most other groundwater contaminants, such as nitrate, pesticides, and volatile organic compounds (VOCs).
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