隔河岩水库水质富营养化状况调查及评价

隔河岩水库位于湖北省境内长江支流清江上，是湖北省重点保护的水源地和旅游胜地。根据1992—2000年间隔河岩水库的水质监测数据，对隔河岩水库的水质现状进行分析发现，隔河岩水库中的总氮浓度、BOD5浓度和CODMn浓度均呈现逐年增加的趋势。此外，还建立了隔河岩水库的富营养化评价标准，用该标准对隔河岩水库的富营养化现状进行评价后得到以下结论：隔河岩水库的总磷、透明度、叶绿素a、CODMn和BOD5这五项指标均处于贫营养状态和贫—中营养状态，只有总氮浓度在各个断面都超过了富营养化标准，这与隔河岩水库库区的农业面源污染较为严重有关。总体来看。隔河岩水库的水质状况良好，库区水质基本属于贫—中营养状态，其营养状态是磷控制型的。

TROPHIC STATE AND ASSESSMENT STANDARD OF THE GEHEYAN RESERVIOR

The Geheyan Reservoir lies on the Qingjiang River in Hubei province. According to the investigation of the Geheyan Reservoir during 1992-2000, the water quality was analyzed. The conclusion was drawn that the concentration of total nitrogen, BOD5 and CODMn was increased every year. In addition to analyzing the water quality of the Geheyan Reservoir, the assess Standard of eutrophication was established. The standard was used to assess the eutrophic state of Geheyan Reservoir and the conclusion could be drawn that the concentration of total phosphorus, diaphaneity, chlorophyll-a, BOD5 and CODMn was less than the assess standard of the Geheyan Reservoir except the concentration of total nitrogen. The situation was due to input of the agricultural non-point pollutant. In general, the Geheyan Reservoir is in poor-mid trophic state, which was controlled by phosphorus.