富营养水体生物修复中浮游植物的群落特征

通过对生物修复中富营养小水体浮游植物群落的分析，探讨了生物修复对浮游植物的影响以及浮游植物对环境因子改变的响应。生物修复实施后的浮游植物种类数比实施前多；浮游植物细胞数和生物量却有明显的下降；而对于Shannon Weaver多样性指数，实施后较实施前有明显的上升；生物修复过程中美丽胶网藻水华得到控制，优势种的指示性由中污变为寡污，优势度也由极度的高优势变为中低度优势，水体治理的前期阶段浮游植物群落的种类组成和结构有明显的改变；浮游植物种类数分别与正磷酸盐和氮磷比呈显著负、正相关，正磷酸盐的浓度与氮磷比的大小对水体浮游植物的种群结构变化具有重要影响。  

THE ECOLOGICAL EFFECTS OF EUTROPHIC WATER BODY WITH BIOREMEDIATION ON PHYTOPLANKTON COMMUNITY

The ultimate aim of bioremediation on the water is to renew the structural and functional characteristic of aquatic ecosystem. In the process of bioremediation, by analysis of the phytoplankton community in the eutrophic water body with bioremediation, the thesis discuss the effect of bioremediation on phytoplankton and the responses of phytoplankton to the changes of environmental facts, in a hope to reflect the effect of bioremediation in accordance with the response of phytoplankton, so as to provide biological proof for illustrating the efficiency of measures taken for the bioremediation. Here follows some components of this test water: water area(350m 2), water dept (60cm), water volume(210m 3).Before testing, Spot survey on water showed it took on a condition of hypereutrophic. Comprehensive measures concerning zoology are taken including the way of adding Bioenergizer, biologic algaecide, effective microbe into water, and planting Macrophyte. The experiment began from 29th.April, 2002. Beforehand, background was sampled once on 27th of April. And after the engineering project, sampling work was done on 16th, and 30th of May, 13th and 27th of June, 7th of July respectively. As the result of the engineering process, there was a great decline on the density and biomass of phytoplankton. Meantime, the species diversity and Shannon-Weaver index have ascended obviously, and species composition and indicator of dominant species changed from mesosaprobic to oligosaprobic. Also the dominant degree changed from extremely high degree to a lower average degree. In addition, the water-bloom of Dictyosphaerium pulchellum were controlled after the engineering brought into operation. The species number of phytoplankton correlated close negatively with PO 4-P but positively with TN/TP. The contents of PO 4-P and the ratio of N/P have big influence to the community of phytoplankton in the water body.