闽江口海域浮游植物群落结构特征

    Study on the ecological characteristics of phytoplankton community in Minjiang Estuary

    • 摘要: 2009年5月、11月分别对闽江口海域进行春季和秋季航次的调查,共检出浮游植物5门54属129种,其中硅藻门46属118种,占总种数的91%,甲藻门5属8种,占总种数的6%,蓝藻门1属1种,占总种数的1%,绿藻门1属1种,占总种数的1%,隐藻门1属1种,占总种数的1%。浮游植物春季航次优势种有3种,分别为中肋骨条藻、旋链角毛藻和柔弱角毛藻;秋季航次优势种也是3种,分别为中肋骨条藻、细弱圆筛藻和琼氏圆筛藻。浮游植物细胞密度范围为1.56×103~7.43×105cell/L,春季高于秋季。春季浮游植物细胞密度与水温呈显著正相关关系,与叶绿素a浓度呈极显著正相关关系;秋季浮游植物细胞密度与盐度呈极显著负相关关系,与溶解无机氮浓度呈极显著正相关关系。

       

      Abstract: Investigations on phytoplankton community and environmental factors were carried out in Minjiang Estuary of Fujian, in May (spring) and November (autumn) of 2009. There were in total 129 species in 54 genera found out in this sea area, of which 118 species in 46 genera were Bacillariophyta, accounting for 91% of all species; 8 species in 5 genera were Pyrrophyta, accounting for 6%; 1 species in 1 genus was Cyanophyta, accounting for 1%; 1 species in 1 genus was Chlorophyta, accounting for 1%; 1 species in 1 genus was Cryptophyta, accounting for 1%. The dominant species in spring were Skeletonema costatum, Chaetoceros curvisetus and Chaetoceros debilis; and the dominant species in autumn were Skeletonema costatum, Coscinodiscus subtilis and Coscinodiscus jonesianus. The cell abundance of phytoplankton ranged from 1.56×103 to 7.43×105 cell/L. The abundance of phytoplankton was significantly correlative to the water temperature and chlorophyll-a concentration in spring. However, there were significant negative correlation of phytoplankton abundance to salinity, and positive correlations of phytoplankton abundance to DIN concentration in autumn.

       

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