Pb^(2+)对衣藻和微囊藻种间竞争的影响  

Effects of Pb^(2+) on inter-specific competition of Microcystis aeruginosa and Chlamydomonas reinhaidtii

作　　者：高乐旋[1] 赵志光[1] 丛志远[1] 张波[1] 刘盛[1] 许治永[1] 

机构地区：[1]兰州大学干旱与草地生态教育部重点实验室,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2007年第1期52-57,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：兰州大学基地科研项目;国家自然科学基金项目(30600040)资助

摘　　要：以衣藻和微囊藻的混合培养来模捌水体生态系统的浮游植物群落,研究了Pb2+不同质量浓度对水体生态系统中衣藻和微囊藻种间竞争的影响．结果显示,其优势种随Pb2+质量浓度的变化而变化,在乙酸铅低质量浓度下铜绿微囊藻为优势种,而在乙酸铅高质量浓度下衣藻变为优势种．测定了Pb2+不同质量浓度对衣藻和微囊藻的生长、叶绿素a含量以及蛋白质的影响,结果表明:微囊藻在乙酸铅低质量浓度污染下生长速度较快,而衣藻对Pb2+高质量浓度污染的耐受能力较微囊藻高,这可能是导致衣藻和微囊藻混合培养的培养体系结构随环境Pb2+污染强度而变化的重要原因．The interspecific competition between Microcystis aeruginosa and Chlamydomonas reinhaidtii under conditions of different Pb^2＋concentrations were studied to evaluate the effects of Pb^2＋ pollution on ＂the phytoplanktonic community of fresh water ecosystem. The results showed that the dominant species altered in respond to different Pb^2＋ concentrations. The dominant species of the simulated community is Microcystis aeruginosa when the concentrations of Pb^2＋ are lower. But when the concentrations of Pb^2＋ are relatively high, Chlamydomonas reinhaidtii became the dominant species. The influence of different Pb^2＋ concentrations on the growth curve, chlorophyll a and proteins were also measured to reveal the mechanisms underlying this change. The results showed that the alternation of dominant species of the simulated ecosystem may be due to faster growth rate of Microcystis aeruginosa under lower Pb^2＋ concentrations and more resistant capacity of Chlamydomonas reinhaidtii to higher Pb^2＋ concentrations.

关 键 词：群落结构 优势种 生物量 衣藻 微囊藻 

分 类 号：Q178.11[生物学—水生生物学] Q145.1[生物学—普通生物学]