应用特征光合色素研究东海和南海北部浮游植物的群落结构

Phytoplankton Community Structure in the Transects across East China Sea and Northern South China Sea Determined by Analysis of HPLC Photosynthetic Pigment Signatures

应用高效液相色谱并结合二极管阵列检测器分析技术,研究了东海与南海北部典型断面浮游植物的光合色素组成,进而由CHEMTAX软件估算浮游植物群落结构。结果表明:东海断面浮游植物叶绿素a生物量大于南海北部断面。受海水层化结构影响,东海PN断面浮游植物群落结构形成上层和下层两种类型,上层以蓝藻为主要优势类群;下层以硅藻为主要优势类群。南海北部S断面浮游植物群落形成近岸与离岸两种类型,近岸以硅藻、隐藻、绿藻为主要优势类群;离岸以定鞭金藻、蓝藻、原绿球藻为主要优势类群。初步分析了研究海区浮游植物群落结构与环境因子的关系。

Phytoplankton samples from typical stations along the East China Sea and the northern south China sea were analyzed by RP-HPLC combined with DAD （diode array detector） to determine pigments composition. Ocean study included PN section along East China sea（ September in 2002） and northern of south China sea（ Novem- ber in 2002 ）. Pigments data were transformed into phytoplankton composition by software CHEMTAX based on least square method and steepest descent algorithm. This work showed that phytoplankton communities in PN transect were clustered into two types, mostly influenced by stratification. Communites in upper layer were dominated by cyanobacteria, while diatoms were most important groups in lower layer. Also two types of phytoplankton community structure in S transect were clustered by the distance from the shore. Diatoms, Cryptophyta, Chlorophyta were main groups in shore, and Prymnesiophyta, Cyanobacteria, Prochlorophyta were main groups offshore. Additionally, primary analysis was carried out to illuminate the relationship of phytoplankton community structure and environmental factors.