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据2007年春季在南海西北部陆架区海域进行的网采浮游植物调查数据,分析了浮游植物群落的结构特征.此次共鉴定出浮游植物4门318种,其中硅藻类183种,甲藻类128种,蓝藻类5种,金藻类2种.大部分海域浮游植物种类数在40～70种之间,外海区域的种类数稍高于沿岸.浮游植物密度的变化范围为0.22×104～3 683.85×104 cells/m3,平均值(标准偏差)为97.49×104(±437.38×104)cells/m3.其高值区主要位于粤西近岸海域,向外海呈递减趋势.调查海域硅藻类的平均密度(标准偏差)最高,为93.82×104(±434.34×104)cells/m3;甲藻类的次之,为3.65×104(±9.08×104)cells/m3.浮游植物优势种主要有拟旋链角毛藻(Chaetoceros pseudocurvisetus)、细弱海链藻(Thalassiosira subtilis)、中肋骨条藻(Skeletonema costatum)、劳氏角毛藻(Chaetoceros loren-zianus)和菱形海线藻(Thalassionema nitzschioides).该调查海域浮游植物多样性指数的变化范围为1.48～6.23,平均值(标准偏差)为4.70(±1.03),其分布趋势与浮游植物密度的分布趋势大致相反.将站位依等深线划分为粤西近岸海区、琼东南近岸海区和外海海区,应用非度量多维标度(nMDS)和聚类分析法分析这3个海区的浮游植物群落结构差异,并通过ANOSIM和SIMPER进行检验.结果表明3个海区之间浮游植物群落结构具有显著性差异,且粤西近岸海区与外海海区之间差异性较高.近岸种拟旋链角毛藻和中肋骨条藻在粤西近岸海区为最主要的优势种,而外海海区优势种较多,且大部分为大洋暖水性种类.
The phytoplankton community structure characteristics were analyzed based on the data collected from the net-planktonic phytoplankton survey carried out in the spring of 2007 in the northwestern continental shelf area of the South China Sea. A total of 318 phytoplankton species were identified, of which 183 were diatom, 128 5 species of cyanobacteria and 2 species of gold algae.Most species of phytoplankton were between 40 and 70 species in the sea and the number of species in the outer sea area was slightly higher than that along the coast.The density of phytoplankton ranged from 0.22 × 104 to 3 683.85 × 104 cells / m3, and the average value (standard deviation) was 97.49 × 104 (± 437.38 × 104) cells / m3.The high value area was mainly located in coastal areas of western Guangdong and showed a decreasing trend towards the sea.The average diatoms The highest density of standard phytoplankton was 93.82 × 104 (± 434.34 × 104) cells / m3, followed by dinoflagellates, 3.65 × 104 (± 9.08 × 104) cells / m3. Chaetoceros pseudocurvisetus, Thalassiosira subtilis, Skeletonema costatum, Chaetoceros loren-zianus and Thalassionema nitzschioides, Phytoplankton diversity index range of 1.48 ~ 6.23, the average value (standard deviation) is 4.70 (± 1.03), and its distribution tendency is roughly opposite to the distribution trend of phytoplankton density.According to the isobaric line, the stations are divided into the coastal areas in western Guangdong, the coastal areas in Qiongdongnan and the outer sea The differences of phytoplankton community structure in these three sea areas were analyzed by nMDS and cluster analysis, and the results were analyzed by ANOSIM and SIMPER.The results showed that the phytoplankton community structure was significant among the three sea areas , And the difference between the coastal areas in the west coast and the offshore areas in the west of Guangdong was higher than that in the offshore areas in the west coast of Guangdong Province.Marxes spp. And S. costatum were the dominant dominant species in coastal areas of western Guangdong, while the dominant species More, and most of the ocean warm water species.