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详细地分析了第二松花江水体中硝态氮、亚硝态氮和氨氮在不同江段、不同水期、不同年际的时空变化规律．结果表明，氮在水中的含量变化与入江城市污水及沿江两岸地表径流水中的氮有直接关系，硝态氮和亚硝态氮在丰水期水中的含量高于枯、平水期．丰水期水中的硝态氮随江段的延长而增高，氨氮在污染江段的含量高于非污染江段．３个水期水中硝态氮和亚硝态氮的含量年际变化显示为１９８５－１９８９年略高于１９８０－１９８４年和１９９０－１９９４年，氨氮含量有逐年升高的趋势
The temporal and spatial variations of NO3 - N, NO3 - N and NH3 - N in the second Songhua River were analyzed in detail in different sections, different water periods and different years. The results showed that the content of nitrogen in water was directly related to the urban sewage in the river and the nitrogen in surface runoff water along the Yangtze River. The content of nitrate nitrogen and nitrite nitrogen in wet season water was higher than that in dry and flat water. The nitrate nitrogen in water during the wet season increased with the extension of the river section, and the content of ammonia nitrogen in the polluted river section was higher than that in the non-polluted river section. The interannual variations of nitrate and nitrite contents in the three water phases show a slight increase from 1985 to 1989 and from 1980 to 1984 and 1990 to 1994 respectively