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作 者 ：孙凌¹;金相灿²;钟远¹;张冬梅¹;朱琳¹;戴树桂¹;庄源益¹

期 刊 ：应用生态学报 2006年 17卷 07期 页码：1218-1223

关键词：群落；

摘 要 ：选取天津市小型人工湖湖水样品，调整氮磷起始质量比(分别为0.5∶1、7.2∶1、25∶1、50∶1)，在水族试验箱内进行生态模拟试验，探讨城市湖水浮游藻类群落对不同氮磷比例的响应.与对照组相比，高氮磷比组绿藻种类减少，蓝藻种类变化不大；低氮磷比组蓝、绿藻种类数均减少.高氮磷比的中氮和高氮箱内，藻类生物量、细胞密度与叶绿素a都远高于对照和高磷箱；高氮箱中叶绿素a均值最高，为69.7 μg·L^-1,中氮箱次之，为54.3 μg·L^-1,对照与高磷箱分别为30.3和29.7 μg·L^-1.试验中后期，高磷箱绿藻门美丽胶网藻(Dictyosphaerium pulchellum)一直占据优势地位；而中氮箱和高氮箱主要优势藻种为皮状席藻(Phormidium corium)、细胶鞘藻(Phormidium tenue)、湖泊鞘丝藻(Lyngbya limnetica)和铜绿微囊藻(Microcystis aeruginosa)等蓝藻.对照箱内物种丰富度最高，中氮箱内生态优势度最高.

Abstract:

A simulation test was conducted in aquaria to study the responses of algal communities to different N/P ratios in urban water body. The water sample was taken from a small artificial lake in Tianjin, and its initial N/P ratio was adjusted to 0.5∶1,7.2∶1, 25∶1 and 50∶1, respectively. The results showed that in high N/P ratio groups, the numbers of Chlorophyta species decreased, while those of Cyanophyta species didn’t change very much. The numbers of these two species were both decreased in low N/P ratio group. Algal biomass, cell density and chlorophyll a content in medium and high N groups were higher than those in control and high P groups. The mean value of chlorophyll a reached the highest (69.7 μg·L^-1) in high N group, and was 54.3, 30.3 and 29.7 μg·L^-1 in medium N, control, and high P groups, respectively. At the midlate stages of culture, green algae Dictyosphaerium pulchellum was dominant in high P group, while blue algae Phormidium tenue, P. corium, Lyngbya limnetica and Microcystis aeruginosa were dominated in
high N/P ratio groups. Control group had the highest species richness, while medium and high N groups had the highest and lowest ecological species dominance, respectively.

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