• 关键词：铜绿微囊藻  孟氏颤藻  湖泊模拟装置  蓝藻  竞争

• 基金项目：国家重点基础研究计划(973)项目(No.2002CB412301);中日合作太湖水环境修复示范项目

• 储昭升
• 国家环境保护湖泊污染控制重点实验室/中国环境科学研究院湖泊环境创新基地, 北京 100012

• 金相灿
• 国家环境保护湖泊污染控制重点实验室/中国环境科学研究院湖泊环境创新基地, 北京 100012

• 庞燕
• 国家环境保护湖泊污染控制重点实验室/中国环境科学研究院湖泊环境创新基地, 北京 100012

• 摘要：为了模拟富营养化状态下2种蓝藻在湖泊中的生长特征,采用大型室内湖泊模拟装置进行了模拟研究,并通过三角瓶实验以及光合作用速率的响应实验对模拟装置中藻的生长特征进行了分析.湖泊模拟装置中,铜绿微囊藻和孟氏颤藻在对数生长期的特征生长速率分别为0·43d^-1和0.32d^-1,但对数生长期很短,仅3～4d.在对数期后有一个很长的“线性期”,即生物量随时间近似成线性增长.在氮、磷较为充分的条件下,由于较强的光合作用导致了水体pH的升高,以及生物量增高导致了藻的自遮蔽作用,使藻的生长容易出现碳源限制和光限制.受水下光的影响,2种藻细胞内叶绿素a含量在对数期内一直增大.随后颤藻细胞内叶绿素a含量又逐渐降低,而微囊藻细胞内叶绿素a含量仍保持较高的水平,其原因可能是微囊藻能适应更高的pH.

• Abstract：Microcystis aeruginosa and Oscillatoria mougeotii are two famous bloom-forming cyanobacteria, which often occur in eutrophic lakes. Their growth rates are difficult to measure in natural lakes due to water current, weather change and zooplankton predation. Lake simulator experiments, flask experiments and photosynthetic analysis were applied here to investigate the growth of M. aeruginosa and O. mougeotii in eutrophic lakes at 25 C. The specific growth rate of M. aeruginosa and O. mougeotii was 0.43d^-1 and 0.32d^-1 in lake simulator experiments, and the exponential growth phase of two algae in lake simulator system was very short (3～4d). Then, there was a long “linear growth phase” after the exponential growth phase of the algae where the biomass increases linearly with time. When nitrogen and phosphorus were replete, carbon resource limitation due to the increase of pH and light limitation by self-shading of algae may occur. Cellular Chlorophylla contents of two algae were increased at exponential phase due to the effect of light. Then it began to decrease for O. mougeotii at the linear growth phase due to increase of pH, while it still remained high content of M. aeruginosa. The reason is that M. aeruginosa should be more adapt to higher pH than O. mougeotii.

• Key words：Microcystis aeruginosa  Oscillatoria mougeotii  lake simulator  blue-green algae  competition

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