【摘 要】
：
南四湖是南水北调东线工程的重要调蓄湖泊和输水干线,预防和控制蓝藻水华是保障南四湖水质达到东线工程调水水质要求的关键环节。2008年6月至2009年6月在南四湖设置5个监测点,每月采样一次,对蓝藻种群构成及密度变化进行了为期一年的调查研究。结果表明：共检测出蓝藻10属19种,占藻类总种数的16.2％；各监测点蓝藻细胞密度范围为0～1120×104个/L,月均值为105.0×104 个/L；蓝藻种类数
【机 构】
：
School of Environmental Science and Engineering, Shandong University, Jinan 250061, China.
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南四湖是南水北调东线工程的重要调蓄湖泊和输水干线,预防和控制蓝藻水华是保障南四湖水质达到东线工程调水水质要求的关键环节。2008年6月至2009年6月在南四湖设置5个监测点,每月采样一次,对蓝藻种群构成及密度变化进行了为期一年的调查研究。结果表明：共检测出蓝藻10属19种,占藻类总种数的16.2％；各监测点蓝藻细胞密度范围为0～1120×104个/L,月均值为105.0×104 个/L；蓝藻种类数与藻细胞密度季节变化一致,夏秋季节高,冬春季节低；蓝藻种群中的优势种属是平裂藻,占26.3％,水华常见藻类如微囊藻和鱼腥藻等占比例小或未检出。浮游藻类优势种属不是蓝藻,气象气候、水流流态等环境条件不利于水华的形成,是南四湖未发生明显水华现象的原因。在此基础上,分析了南水北调东线工程对南四湖水环境的影响,提出了预防南四湖发生蓝藻水华的污染防治措施。
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