2009 年冬季南海北部网采浮游植物群落结构

根据2010年1月6～30日对南海北部的调查取样，作者对该海域网采浮游植物的分布和群落结构特征等进行了分析。共鉴定浮游植物4门52属155种（包括变形及变种），主要以温带近岸和广布性种为主，其中硅藻有38属94种，占总种数的60．6％；甲藻有12属58种，占总种数的37．4％；浮游植物平均细胞丰度为36．46×10^4个／m^3，硅藻平均细胞丰度为13．77×10^4个／m^3，甲藻平均细胞丰度为1．39×10^4个／m^3，铁氏束毛藻（Trichodesmium thiebautii）平均细胞丰度为21．30×10^4个／m^3。粤东近岸区域是浮游植物高密集区，珠江口及其西南沿岸其次，而浮游植物稀疏区主要在调查区的中部海域，呈现出沿远岸区域逐渐降低的平面分布格局。除铁氏束毛藻为绝对优势种外，主要优势种有：菱形海线藻（Thalassionema nitzschioides）、短刺角毛藻（Chaetoceros messanensis）、圆筛藻（Coscinodiscus spp．）、粗根管藻（Rhizosolenia robusta）及角毛藻（Chaetoceros spp．）等。浮游植物群落香农．威纳物种多样性指数（H’）平均值为4．50，Peilou均匀度指数（J）平均值为0．81。浮游植物多样性程度较高，与细胞丰度平面分布基本呈相嵌分布，仅在近岸出现低值。

Community structure of netz-phytoplankton in northern South China Sea in winter, 2009

Based on the cruise in northern South China Sea(SCS) from 6th January to 30th,2010,we analyzed the characteristics of netz-phytoplankton distribution and community structure in this area.The majority of species ecotype were neritic and cosmopolitan in temperate coastal seas.One hundred and fifty-fie species were identified (including variety and form) belonging to 4 phyla with 52 genera,in which 60.6% were diatoms(38 genera and 94species) and 37.4% were dinoflagellates(12 genera and 58 species).The average ...