湖泊水体氮、磷形态分布特征及其与藻类生长的关系是湖泊富营养化研究的重要方面.采用GPS定位,在程海湖设置了3个断面9个采样点,研究了氮、磷形态分布特征,并分析了各形态氮磷与叶绿素a的相关性.结果表明:总氮(TN)质量浓度为0.773 mg·L-1,总磷(TP)质量浓度为0.046 mg·L-1,叶绿素a质量浓度为0.024 mg·L-1.氮素的赋存形态特征是以溶解态总氮(DTN)占大部分,DTN中又以溶解态有机氮(DON)占绝大部分；磷素的存在特点是溶解态无机磷(DIP)含量比重较大.各形态氮、磷都有明显的季节性波动但区域性差异不明显,叶绿素a则有明显的季节节律和时空差异.叶绿素a很好地响应了总氮(TN)、总磷(TP)、溶解态总氮( DTN)、溶解态总磷(DTP)、颗粒态总氮(PTN)、颗粒态总磷(PTP)的变化.程海富营养化受氮和磷共同限制,控制富营养化必须同时削减氮和磷.%The speciation and temporal and spatialdistribution of nitrogen and phosphorus are thought to be important for algae growth and eutrophication in lake waters. Nine sampling plots on three sections were established in lake chenghai, Chinaby global positioning system tostudy the speciation and distribution ofnitrogen and phosphorus, and the irrelationships withchlorophyl-a, an indicator of eutrophication.an indicatior of eutrophication. The results indicated that thetotal nitrogen, total phosphorus.and total chlorophyl-a in the lake water were 0.773, 0.046 and 0.024 mg-L-1 respectively. The majority of the total nitrogen was dissolved nitrogen, in which dissolved organic nitrogen was predominant, while dissolved inorganic phosphorus consisted ofmajority of the total phosphorus. The concentrations ofthese nitrogen and phosphorus species show The speciation and temporal and spatialdistribution of nitrogen and phosphorus are thought to be important for algae growth and eutrophication in lake waters. Nine sampling plots on three sections were established in lake chenghai, Chinaby global positioning system tostudy the speciation and distribution ofnitrogen and phosphorus, and the irrelationships withchlorophyl-a, an indicator of edsubstantial seasonal changes, butsignificant spatial variation between the sampling locations was not found. However, chlorophyll-a showedapparent spatial and temporal changes, and its content was significantly affected by the changes of various nitrogen and phosphorus includingtotal nitrogen, totalphosphorus, dissolved total nitrogen, dissolved total phosphorus, particulate total nitrogen and paniculate total phosphorus. These results suggest that nitrogen and phosphorus are key factors for the eutrophication in Lake Chenghai. To eliminate the eutrophication, reduction ofnitrogen and phosphorus levels is a necessity.
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