人工湖早期浮游藻类群落特征及其影响因子研究

Study on Characteristics of Phytoplankton Community and its Influencing Factors in the Early Stage of an Artificial Lake

为探明人工湖早期浮游藻类及其水体富营养化的潜在风险,于2022年10月30日在紫琅湖湖区设置13个采样点,采用典范对应分析法(CCA)解析了浮游藻类群落特征及其驱动因子。研究结果表明,共鉴定出浮游藻类8门33科58属,共73种。其中硅藻门和绿藻门种数最多,分别为25和26种。以细胞密度论,蓝藻门,隐藻门和绿藻门占优势,其细胞密度分别为7.7×10^(5)~6.7×10^(6),1.7×10^(5)~3.7×10^(6),0.5×10^(5)~3.2×10^(6) cells/L;而以生物量论,隐藻门和硅藻门占优势,其生物量分别为0.92~5.52,0.42~1.39 mg/L。以蓝藻门的平裂藻(Merismopedia sp.)和细鞘丝藻(Leptolyngbya sp.),硅藻门的直链藻(Melosira sp.),绿藻门的空星藻(Coelastrum sp.),隐藻门的尖尾蓝隐藻(Chroomonas acuta)和隐藻(Cryptomonas sp.)为优势种。不同采样点之间群落组成,细胞密度和生物量存在显著差异。典范对应分析结果表明,浊度(NTU)、总有机碳(TOC)、溶解氧(DO)和pH值是影响浮游藻类分布特征的显著环境因子。

To investigate the early phytoplankton and the potential risks of eutrophication in an artificial lake,13 sampling points were set up in the lake area on October 30,2022.The phytoplankton community characteristics and their driving factors were analyzed using canonical correspondence analysis.The results showed that a total of 73 species of phytoplankton were identified,belonging to 8 phyla,33 families,and 58 genera.The diatom and green algae phyla had the most species,with 25 and 26 species respectively.In terms of cell density,the cyanobacteria,cryptophyta,and green algae were dominant(ranging from 7.7×10^(5)~6.7×10^(6),1.7×10^(5)~3.7×10^(6),0.5×10^(5)~3.2×10^(6) cells/L,respectively),while in terms of biomass,the cryptophyta and diatom phyla were dominant(ranging from 0.92 to 5.52 mg/L and 0.42 to 1.39 mg/L,respectively).The dominant species were Merismopedia sp.and Leptolyngbya sp.from cyanobacteria,Melosira sp.from diatoms,Coelastrum sp.from green algae,and Chroomonas acuta and Cryptomonas sp.from cryptophyta.There were significant differences in community composition,cell density,and biomass among different sampling points.Canonical correspondence analysis indicated that turbidity(NTU),total organic carbon(TOC),dissolved oxygen(DO),and pH were significant environmental factors affecting the distribution characteristics of phytoplankton.