密云土门流域出口氮磷污染分析

Nitrogen and Phosphorus Pollution Analysis in a Small Watershed Outlet of Tumenxigou

为了满足水污染控制规划和流域水资源保护的需要,在土门西沟出口对径流量、径流水质进行同步监测,结合以前的监测资料,对径流量与污染负荷之间的关系进行分析。结果显示:流域内水质氮磷含量超标,特别是氮远远高于Ⅴ类水,总磷在Ⅲ类水标准以内,流域的非点源氮磷源已成为流域主要污染物;径流量和污染负荷有很好的相关性,其中总磷与地表径流量相关性最高,总氮与地表径流量相关性比较差,氨氮是氮源污染的主要形态,而且氨氮容易挥发和转化;这与当地居民使用氮肥和二铵有关;总氮与氨氮的相关关系较好,和硝态氮相关系数较小;控制污染物的排放和减小暴雨径流是有效治理非点源污染措施。

For meeting the needs of the water resources protection and the water pollution control planning,this paper makes the analysis of relationship between runoff and pollution load of Tumenxigou outlet.Main results are as follows： the content of Nitrogen and Phosphorus exceed standard,especially nitrogen content is much more than classⅤ,Phosphorus content is less than Class Ⅲ,Nitrogen and Phosphorus is the main pollution.The runoff have a good relationship with pollution load,correlation coefficient between runoff and phosphorus is most well.The Nitrogen has the bad relation with runoff.Ammonia and Nitrogen are the main existent feature in nitrogen sources pollution,which has relation with the local nitrogenous fertilizer and diammonium.Nitrogen has good relation with Ammonia and Nitrogen,bad relation with nitrate nitrogen.Pollution emission controlling and rainstorm surface runoff decreasing are the effective measures.