---

作 者 ：李慧敏,杜桂森*,姜树君,吴玉梅,武佃卫,杨忠山

期 刊 ：生态学报 2010年 30卷 5期 页码：1322~1327

关键词：官厅水库；浮游藻类；微囊藻毒素；理化指标；

Keywords:Guanting Reservoir, phytoplankton, microcystin, physiological-chemistry index,

摘 要 ：2007年4-11月的调研结果显示，官厅水库为富营养型湖泊，TP、 TN、 CODMn 的含量分别为0.12、1.63、6.01 mg?L-1。浮游藻类密度为1794.08×104cells?L-1，其中蓝藻占51.75%，绿藻占25.12%，硅藻占12.56％，夏秋季出现了以微囊藻（Ｍicrocystis）占优势的蓝藻水华。库区水体中微囊藻毒素（MC-LR）的平均含量为0.794μg?L-1，但8-9月份为1.231μg?L-1，超出地表饮用水安全限值23.1％。统计分析显示，除受季节制约外，总磷和硝态氮可能是影响官厅水库MC-LR生物合成的主导营养因子；可溶性铁可能是MC-LR生物合成中限制性微量元素。治理水体富营养化是降低官厅水库微囊藻毒素含量，恢复其饮用水源地功能的关键。

Abstract:The investigation in 2007 revealed that Guanting Reservoir had been a eutrophic lake. The concentrations of total phosphorus (TP), total nitrogen (TN) and salt permanganate index (CODMn) were 0.12mg?L-1, 1.63mg?L-1 and 601mg?L-1 respectively. The density of phytoplangkton was 1794.08×104cells L-1 including 51.57% of Cyanophyta, 2512% of Chlorophyta and 12.56% of Bacillariophyta. The water bloom of Microcystis happened in summer-autumnal seasons. The microcystin (MC-LR) was 0.794μg?L-1 in average concentration, but it was increased to 1.231μg?L-1 in August and September in 2007, which was gone beyond 23.1％ in safety limitation value of drinking water on the earth′s surface. The MC-LR content was positive correlation with Cyanobacteria density in Guanting Reservoir. The statistical test results showed that TP and NO3-N were main nutrient factors influencing the biosynthesis MC-LR. However, solubility iron was main microeiement influencing the biosynthesis MC-LR. Therefore, managing eutrophic lake had been a key for reducing the microcystin content and recovering the function of drinking water source in Guanting Reservoir

---