渤海湾浮游植物种群变化及其影响因素

Temporal changes of marine phytoplankton communities and influential factors of Bohai Bay,China

根据2004~2007年的调查数据,结合以往资料,分析了近20 a来天津港海域浮游植物种类、丰度、生物量及多样性的变化规律及其影响因素。结果表明,天津港海域共有浮游植物7门126种,以硅藻和甲藻为主。2000年后,夏季甲藻比例升高,绿藻开始出现。与20世纪90年代相比,2000年后浮游植物的丰度和生物量均维持在较高水平,表现为春季达到重度富营养水平,夏季为中营养水平。浮游植物多样性在2005年呈现下降趋势。研究表明,港口航道工程可能是影响天津港海域浮游植物种群变化的重要原因。

Based on the survey data from 2004 to 2007 and other data,characters of variation and influential factors of the phytoplankton species,abundance,biomass and biodiversity in Tianjin Harbor,China were analyzed in last two decades.Total of 7 phyla 126 species were identified,among which,the majority were Bacillariophyta（89） and Pyrrophyta（19）.There was variation on the species composition with the increase of Pyrrophyta and Chlorophyta during summer since 2000.There were higher abundance and biomass of phytoplankton after 2000 than 1990′s.The seawater was hyper-eutrophic in spring and was meso-eutrophic in summer.The biodiversity of phytoplankton in Tianjin Harbor declined dramatically in 2005.The result of this study suggested that population variation of phytoplankton was affected by the harbor engineering.