从浮游动物群落结构与功能的变化看府河－白洋淀水体的自净效果

本文报道了１９９３年５月、７月和１０月在府河－白洋淀六个采样站浮游动物生态学特征及其与水质相互关系的调查研究结果。利用浮游动物群落结构的综合指标（种类组成差异，种类数目变化，个体数量变动，生物量分布，多样性指数ｄ值的增减）和功能参数（ＰＦＵ原生动物的群集速度）评价了府河－白洋淀水体的污染程度和自净效能。按照Ｍａｒｇａｌｅｆ多样性指数ｄ值的变化范围，把府河－白洋淀六个采样站的水质划分成不同的次序和等级。文中就如何控制污染，提高府河的自净效果，改善白洋淀的水质提出了具体措施和建议．

EVALUATION OF SELF-PURIFICATION EFFICIENCY OF FUHESTREAM-BAIYANGDIAN LAKE THROUGH ZOOPLANKTON

The Fuhe Stream is the majar one for the discharge of wastewater from Baoding City.Itreceives a large amount of domestic sewage and some industrial wastewater from the urbandistricts and then runs into Baiyangdian Lake.To monitor the toxic stress of pollution and the efficiency of self-purification at varioussections of Fuhe Stream-Baiyangdain Lake, investigations into the temporal and spatial variations of zooplankton community structure and function were undertaken in May,July andOctober,1993.The water quality in Fuhe Stream-Baiyangdain Lake was assessed by qualitative and quantitative analyses of zooplankton community.Six sample stations from the upstream close to pollution source to the downstream into Baiyangdian Lake weredistinguishable in terms of differences in the species richness, PFU colonization rate(a functional parameter),individual abundance,biomass and diversity index.Two sample sites ofWangting and Anzhou located in upstream had poor water quality due to the receiving of agreat deal of sewage which contained high concentrations of BOD,COD,NH4-N and T-P,and this was reflected in the variations of the structural and functional parameters ofzooplankton community,that is,impoverished species richness,low PFU colonization rate,high tolerant population abundance and low diversity index value.Pollution stress was obviously lessened at two stations ie Dongxiangyang and Yangdikou in the middle reaches ofFuhe Stream due to water quality's improvement by showing of a great species restoration.The self-purification was greatly enhanced and water quality was clearly improved at twosample stations,ie Wangjiazai and Zaolinzhuang in the downstream. This was indicated bythe dramatic increase in the number of species, the high PFU colonization rate and the highdiversity index value as well as the decrease in the tolerant population abundance andbiomass,along with the reduction of pollutants.The self-purification in Fuhe Stream plays an important role in protecting water qualityof Baiyangdian Lake. The author presents some constructive suggestions for keeping the stability of self-purification in Fuhe Stream to improve water quality of Baiyangdian Lake.