滇池蓝藻对沉水植物生长的影响  

Impacts of Cycanobacteria on the Growth of Submerged Macrophytes, Dianchi Lake

作　　者：陈开宁[1] 李文朝[1] 吴庆龙[1] 强胜[2] 

机构地区：[1]中国科学院南京地理与湖泊研究所,南京210008 [2]南京农业大学,南京210095

出　　处：《湖泊科学》2003年第4期364-368,共5页Journal of Lake Sciences

基　　金：科技部重大项目"滇池蓝藻水华污染控制技术研究"课题(K99-05-35-01-02)资助.

摘　　要：本文通过模拟生态系统和大型试验围隔,研究了蓝藻(Cycanobateria)胁迫下的蓖齿眼子菜(Potamogeton pectinatus)和竹叶眼子菜(Potamogeton malaianus)生长情况. 模拟生态系统研究结果表明,蓖齿眼子菜生长受蓝藻的影响不大,其在有大量蓝藻胁迫的水体中生长22d后,生物量为试验初始时的91.6%,在没有蓝藻胁迫的水体中,其生物量增加了27.7%,差异不显著;而竹叶眼子菜生长受蓝藻影响显著,在有蓝藻胁迫的水体中生长22d后,其生物量下降了57.1%,在没有蓝藻胁迫的水体中,其生物量增加了24.1%. 野外10 hm2大型围隔栽种试验结果显示,在有蓝藻胁迫条件下蓖齿眼子菜生长良好,经过5 个月生长其覆盖率达到60%,而竹叶眼子菜几乎全部死亡. 综合上述两方面试验结果表明蓖齿眼子菜耐受蓝藻胁迫的能力比竹叶眼子菜强.The growth of Potamogeton pectinatus and P. malaianus in waters with a great number of cycanobacteria was studied through some micro-ecosystems and a large enclosure (6667m2). The results of the micro-ecosystems experiment showed that influence of cycanobacteria on P. pectinatus was not Significant. Biomass of P. pectinatus only decreased 8.4% when it grew in waters with a great number of cycanobacteria in 22 days, but biomass of P. pectinatus increased 27.7% in waters without cycanobacteria. And that of cycanobacteria on P.malaianus was Significant. Biomass of P. malaianus decreased 57.1% when it grew in waters with a great number of cycanobacteria in 22 days, whereas Biomass of P. malaianus in waters without increased 24.1%. The results of the large enclosure experiment showed that the cover rate of was up to 60% under the condition of pressure with a great number of cycanobacteria. However, P. malaianus diedont under the same condition. Therefore, the results of above indicated that impact of cycanobacteria on P. pectinatus was less pronounced than that on P. malaianus.

关 键 词：蓝藻 沉水植物 蓖齿眼子菜 竹叶眼子菜 模拟生态系统 滇池 

分 类 号：X173[环境科学与工程—环境科学]