太平湖水库的浮游藻类与营养型评价

Algae in Taipinghu Reservoir and its trophic level.

研究了太平湖水库的浮游藻类与营养类型。共发现藻类175种。绿藻门的种类最多(87种),占种类总数的50％。硅藻和蓝藻次之(分别为34和33种),各占19.4％和18.8％。其它5门藻合计21种,仅占种类总数的11.8％。根据营养型分析结果,太平湖目前水质优良,属中营养型水体;但是藻类的优势种类和总氮含量两项指标已达富营养水平,而且微囊藻(Microcystis)水体较多出现,表明该水体已有向富营养化发展的趋势。含磷量较低(总磷0.012mg/L)是浮游藻类进一步大量繁殖的限制因子。为防止水质恶化,除了应控制含氮化合物的污染外,限制磷的输入尤为重要。

The algae in Taipinghu Reservoir and its trophic level were investigated during 1985—1986. 175 species of algae are observed. Chlorophyta is the most important group with 87 taxa, representing 50% of the total. Bacillariophyta and Cyanophyta are subdominant groups with 34(19.4%) and 33(18.8%) taxa respectively. Other five phyla with 21 taxa are less important, representing 11.8% of the algal flora. According to the results of trophic evaluation, this reservoir is a mesotrophic waters with clear water. Two parameters (dominant species and TN) achieve eutrophic level, and the blooms of Microcystis occurred sometimes indicate that the trophic level of the reservoir is transiting from mesotrophy to eutrophy. At present, the overgrowth of algae is limited by low phosphorus concentration (TN 0.012mg/L). In order to avoid further eutrophication, it is important to prohibit the discharge of phosphorus and nitrogenous compound into the reservoir.