【摘要】 为研究华南大型深水水库浮游植物群落特征,评价水库营养状态,文章于2019年9月起对新丰江水库开展了为期1 a的调查研究。结果表明,研究期间共鉴定出浮游植物8门89属189种,丰度水平介于3.3×10~5～1.178×10~7cells/L,生物量值介于0.26～2.49 mg/L。浮游植物细胞密度和优势种属存在明显时间差异,前期优势种为功能上适应混合水体特征的小尖头藻和浮鞘丝藻,后期优势种更替为适应贫营养洁净水体特征的小环藻属和小球藻属,Shannon-Wiener多样性指数和Pielous均匀度指数逐月上升,Margalef丰富度指数逐月下降。CCA筛选结果,水温和溶解氧是影响新丰江水库浮游植物的主要环境因子。综合营养状态指数评价表明,新丰江水库水环境为贫营养。该研究可为新丰江水库水环境质量保护及富营养化防治提供一定的科学依据。更多还原

【Abstract】 In order to investigate the characteristics of phytoplankton and evaluate the trophic status of Xinfengjiang Reservoir in southern China, a study was carried out from September 2019 to August 2020. The results showed that, total of 189 phytoplankton species was identified, belonging to 8 phyla and 89 genera. The abundance and biomass of phytoplankton ranged from 3.3×10~5～1.178×10~7 cells/L and 0.26～2.49 mg/L respectively. Phytoplankton cell density and dominant species were varied in temporal distribution. Early, Raphidiopsis and Planktolyngbya were dominant genera which functionally adapted to the mixture of water bodies. Lately, the dominant genera were Cyclotella and Chlorella, which adapted to the oligotrophic status of reservoir. Shannon-Wiener index and Pielous evenness index increased month by month, while Margalef richness index were decreased. Canonical correspondence analysis demonstrated that water temperature and dissolved oxygen were the key factors controlling phytoplankton community structure in the Reservoir. According to the comprehensive trophic level index, the Reservoir was oligotrophic. This study provides a scientific basis for water quality protection and eutrophication prevention and control in Xinfengjiang Reservoir.更多还原