三峡库区支流富营养化状况普查

General investigation of eutrophication for tributaries in TGP reservoir area

三峡水库135 m水位运行期间,于2005年在三峡库区10条支流的富营养化现状和水华发生情况进行了监测,并结合以往的监测资料,得出以下结论:库区支流水体年度评价以中营养状态为主,春、夏两季营养水平较高,距大坝较近的河流营养水平相对较高;库区水华频发区域主要集中在香溪河等受干流回水顶托影响的河流的滞水河段,春、夏季为水华高发期,水华优势种表现出由河流型硅藻类向湖泊型蓝、绿藻类的演变趋势。

The monitoring on eutrophication and alga bloom condition in 10 tributaries in the TGP reservoir area was conducted during 135 m operation of TGP in 2005,and combined with previous monitored data,it is concluded that the water state of the tributaries is mainly in middle eutrophication,more severe in spring and summer as well as in relative near tributaries from the TGP dam.The frequent occurring area of alga bloom mainly centralized in backwater effected tributaries,such as the Xiangxi river;the spring and summer are frequent occurring period of alga bloom;the advantage genus of alga bloom shows a variation tendency from river-type genus of diatom to lake-type genus of blue-green algae.