中文摘要：

为了分析大型生态净化工程在不同季节对水体氮素削减效果,对中国目前规模最大的饮用水源地生态净化工程——盐龙湖进行了研究.原水经生态净化工程后,氮素含量下降明显,春夏秋冬四季NH4＋-N去除率分别为：69％、88％、80％和74％;TN去除率分别为25％、78％、60％和27％.各处理单元在不同季节削氮效果都发挥着重要作用,其中挺水植物净化区和沉水植物净化区是整个生态净化工程的核心单元,加强对水生植物的管理,是提升氮素去除率的关键.

英文摘要：

In order to analyze nitrogen purification efficiency by large-scale ecological purification engineer- ing in different seasons, take research on the Yanlong Lake,the largest ecological purification engineering of po- table water sources in China. Through ecological purification engineering, nitrogen content in raw water decrea- ses significantly. The removal rates of NH4＋-N were 69% ,88% , 80% ,74% , respectively in spring, summer, autumn and winter,with 25% ,78% ,60% , 27% of the TN removal rate correspondently. Every processing unit played important roles in nitrogen-cutting in different seasons. Among all the units, the emerged ＆ submerged a- quatic plant areas are the cores of the ecological purification engineering. The key to improve removal rate of ni- trogen is strengthening the management of aquatic plants.