中文摘要：

为了解呼伦湖目前水体的氮磷污染状况,以呼伦湖的主要入湖河流克鲁伦河为研究对象,分析了夏季水体中氮磷污染现状及各形态氮磷指标之间的相关性,利用氮磷比解析了克鲁伦河入湖后对呼伦湖水环境产生的影响。结果显示,夏季克鲁伦河水体受氮素污染严重,TN严重超标,氨氮为TN的主要赋存形态,TP整体维持在《地表水环境质量标准》（GB 3838—2002）中Ⅳ类水平,污染物主要来源于沿途居民的生活污水及河流两岸发达畜牧业导致的大量有机物入河;各形态氮磷指标之间存在一定的相关关系,在一定程度上证明了水体中氮磷的输入途径较一致,均来源于外源污染,且具备点、面源共存的污染特征;适宜的氮磷比为藻类的生长和繁殖创造了条件,氮磷等营养元素的大量入湖,将使湖体的富营养化程度加剧,增加呼伦湖水华暴发的风险,进而改变湖体生源要素的营养结构及循环特征,直接导致湖体水环境的继续恶化,严重威胁鱼类等水生生物的生命安全。

英文摘要：

To study the current nitrogen and phosphorus pollution status in Hulun Lake water body,Kherlen River,the main inflow river of Hulun Lake,was selected as research object.Nitrogen and phosphorus pollution conditions in summer and the correlation between different morphological indexes were analyzed.Using the nitrogen and phosphorus mass ratio,the impact of the inflow river of Kherlen River on Hulun Lake was analyzed.As indicated in the results,Kherlen River was severely polluted in summer,with total nitrogen seriously exceeded standard;however,level of phosphorus was relatively low,maintaining at classⅣ of＂Surface water environmental quality standard＂（GB3838-2002）.The main pollution sources were domestic sewage and large amount of organic matter flow from the developed livestock husbandry on the riverside.Different nitrogen and phosphorus indicators were relatively correlated with each other,indicating that input pathways of nitrogen and phosphorus were both from external sources,including both point and non-point source pollution.Suitable nitrogen and phosphorus ratio created an ideal condition for growth and reproduction of algae.Aggravating severity of eutrophication and chances of water bloom break out events were more likely to happen due to continuous inflow of nitrogen,phosphorus and other nutrients;changes in nutrition structure and circulation characteristics of the water elements were also more likely to incur,leading to further water environment deteriorates;and eventually,safety of fish and other aquatic lives would be threatened.