为了解大型城市景观水体成湖初期浮游植物特征,于2013年和2014年9月初对湖南省松雅湖浮游植物及水质因子进行了调查研究.结果表明:共检出浮游植物7门118种,细胞丰度在103×104~1514×104cells/L之间,平均为378.5×104cells/L;蓄水前、后,浮游植物优势种群差异较大,前期主要为:细小平裂藻、湖泊浮鞘丝藻、梅尼小环藻、尖尾蓝隐藻和啮蚀隐藻,而次年主要以水华微囊藻、惠氏微囊藻、小空星藻等占有优势,并在局部出现蓝藻"水华".分析发现:蓄水造成的水位升高、湿生植物被淹没、偏高的营养盐水平和水生动物的相对匮乏等因素是引起浮游植物前后群落差异的主要因素.为更好地保护松雅湖生态环境,应及时清理没入水中的湿生植物残体,进行水生植被恢复,并适当投放水生动物,以提高生态系统稳定性.%In large landscape lake,the phytoplankton community is regulated in a distinct way from that in the other lakes or reservoirs in the process of construction.To study this dynamics,the phytoplankton and water quality in Lake Songya in Sep.2013 and Sep.2014 were sampled and analyzed.Until now,Lake Songya is the largest artificial lake in Hunan Province,China.The results showed that 118 species of phytoplankton belonging to 7 phyla were identified.The phytoplankton had an abundance ranging from 103×104 cells/L to 1514×104cells/L,with an average abundance of 378.5×104cells/L.The phytoplankton community was dominated by Merismopedia tenuissima,Planktolyngbya limnetica,Cyclotella meneghiniana,Chroomonas acuta,and Cryptomons erosa in Sep.2013,and Microcystis flos-aquae,M.wesenbergii,and Coelastrum microporum in Sep.2014,respectively.The obviously differences in phytoplankton community between the twice observations were mainly owing to the impounding process which was considered as leading the colonization of new species.Some other factors such as high nutrient concentrations,relative static hydrological conditions and lack of benthic organisms also affected the growth of cyanobacteria.For the sake of the better ecological management of Lake Songya in the future,some suggestions such as removing hygrophytes residues,aquatic macrophyte restoration and stocking zooplankton and zoobenthos were proposed.
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