摘要
2014年8月20日—9月6日对南海北部（18°-22°N,114°-116°E）的11个站位进行了浮游植物群落结构的调查,其中2个站位为时间连续站。共鉴定出浮游植物4门68属229种（包括变种、变型及未定种）,其中硅藻门43属147种,甲藻门20属75种。浮游植物平均细胞丰度为16.318×10^3 cells/L,硅藻的平均细胞丰度为14.653×10^3 cells/L,占总丰度的89.80%,硅藻的分布决定了浮游植物的分布。近岸冲淡水含有丰富的营养盐,因此近岸海域的细胞丰度高于大洋海域,垂直分布表现出先增加后降低的趋势。本次调查的优势种为铁氏束毛藻（Trichodesmium thiebautii）、中肋骨条藻（Skeletonema costatum）、拟脆杆藻（Fragilariopsis sp.）、短孢角毛藻（Chaetoceros brevis）、菱形海线藻（Thalassionema nitzschioides）、柔弱伪菱形藻（Pseudo-nitzschia delicatissima）、尖刺伪菱形藻（Pseudo-nitzschia pungens）、扁面角毛藻（Chaetoceros compressus）、洛氏角毛藻（Chaetoceros lorenzianus）以及海洋角毛藻（Chaetoceros pelagicus）,各优势种的分布趋势相似,呈现出近岸高于外海的趋势。Shannon-Weiner多样性指数与Pielou均匀度指数的平均值分别为2.37和0.56。浮游植物昼夜垂直变化明显。典范对应分析结果显示浮游植物空间分布主要受总氮盐、硅酸盐、微型浮游动物与盐度的影响。根据细胞丰度进行的站位的聚类分析显示浮游植物群落明显可划分为近岸群聚与大洋群聚。
Phytoplankton community structure was investigated in 11 stations in the northern South China Sea（18°-22°N,114°-116°E）during August 20 to September 6in 2014,in which 2stations were time series stations.68 genera and 229species（including variety,form and unidentified taxa）belonging to 4phyla were identified,in which43 genera and 147 species belonged to Bacillariophyta,and 20 genera and 75 species were Pyrrophyta.The average cells abundance was 16.318×10^3 cells/L,and diatoms accounted for 89.80% with 14.653×10^3 cells/L.The distribution of diatoms governed the distribution of phytoplankton.The abundance in neritic area was higher than that in open ocean due to the high nutrition concentration of fresh water in neritic area.The cells abundance increased firstly and later decreased vertically.The dominant species were Trichodesmium thiebautii,Skeletonema costatum,Fragilariopsis sp.,Chaetoceros brevis,Thalassionema nitzschioides,Pseudo-nitzschia delicatissima,Pseudonitzschia pungens,Chaetoceros compressus,Chaetoceros lorenzianus and Chaetoceros pelagicus.The distribution patterns of dominant species were similar,the coastal abundance was high in contrast with that in other area.The average Shannon-Weiner diversity index and Pielou evenness values were 2.37 and 0.56 respectively.Phytoplankton diurnal fluctuation was obvious.The result of CCA analysis showed that total nitrogen,silicate,micro-zooplankton and salinity were the main controlling factors in the survey area.Cluster analysis that based on surface cells abundance aggregated stations into coastal group and pelagic group obviously.
出处
《海洋学报》
CAS
CSCD
北大核心
2016年第4期54-65,共12页
基金
海洋局公益性项目(201105021-03)
国家重点基础研究发展计划(2015CB954002)
国家自然科学基金(491128212
1176136
41276124)
教育部新世纪优秀人才计划(NCET-12-1065)
关键词
南海北部
浮游植物
群落结构
昼夜变化
典范对应分析
聚类分析
The northern South China Sea
phytoplankton
community structure
diurnal fluctuation
canonical correspondence analysis
cluster analysis
