Phytoplankton community characterization and preliminary evaluation on water quality of Majia and Tuhai River in Haihe River basin | 马颊河与徒骇河浮游植物群落特征及水质初步评价

chinois. 摘　　要：对海河流域马颊河与徒骇河的浮游植物种类组成、种群数量、优势种、污染指示种等进行调查研究，结果表明马颊河浮游植物为126种，隶属7门67属；徒骇河浮游植物为114种，隶属7门63属。2条河流浮游植物种类组成均以绿藻为最多，其次是硅藻和蓝藻；各采样点蓝藻、绿藻和硅藻出现的频度均为100％。在种群数量上，马颊河蓝藻占绝对优势（占藻类数量的53．59％），而徒骇河绿藻占优势（占藻类数量的35．73％），马颊河和徒骇河浮游植物平均密度分别为22．424×10. 和13．950×10. 个／L。马颊河ShannonWeaver多样性指数、Margalef指数和Pielou指数变动范围分别为2．48～4．64、3．62～9．91和0．47～O．84；徒骇河的变动范围分别为3．04～4．57、2．94-10．15和0．63～O．82。根据上述参数，初步评价马颊河与徒骇河的水质总体状况较好，处于中营养，但有向富营养转变的趋势，应注意加强对河流水质的管理和保护。

anglais. The investigation of phytoplankton community characterization including species composition,population size,dominant species and saprobic indicators was conducted in order to evaluate the water quality of Majia and Tuhai River in Haihe River basin. The results revealed that 126 species of phytoplankton belonging to 7 phyla and 67 genera existed in Majia River, while 114 species of phytoplankton belonging to 7 phyla and 63 genera were found in Tuhai River. Chlorophyta was the richest algae in both rivers, followed by Bacillariophyta and Cyanophyta. Cyanophyta, Chlorophyta and Bacillariophyta were found in all the sampling sites （the frequency was 100%）. Cyanophyta was absolute the majority in Majia River in population, which accounted for 53. 59% while the Chlorophyta was predominant in Tubal River,which accounted for 35. 73%. The average density of phytoplankton in Majia and Tuhai River were 22.424 × 10. ind./L and 13. 950×10. ind./L, respectively. The Shannon-Weaver index,Margalef index and Pielou index varied among 2. 48-4. 64,3.62-9.91 and 0. 47-0. 84 in Majia River, while 3.04-4. 57,2. 94-10. 15 and 0.63-0.82 in Tuhai River, respectively. The water quality of both rivers was preliminary evaluated based on above results. In conclusion water quality was good, can be labeled as mesotrophie, but had the potential to turn to eutrophication. So we should pay attention to protect the water quality and enhance the management of the both rivers.