| 摘要: |
| ：根据2006 年11 月在长江口及其邻近水域(30°30′N～32°30′N, 121°E～123°30′E)39 个测站采集的浮游植物水样研究了该水域浮游植物群集特征。调查区浮游植物以硅藻和甲藻为主, 此外还有少量的金藻、蓝藻和绿藻。浮游植物细胞丰度介于0.13～59.69 个/mL 之间,平均为4.39 个/mL,主要优势物种为圆海链藻 Thalassiosira rotula 和骨条藻Skeletonema spp., 调查区两个细胞丰度密集区分别出现在靠近口门以及外海水域。浮游植物细胞在20 m 层出现最大值。调查区两个典型断面的浮游植物分布特征分别由骨条藻和圆海链藻所刻画。固氮蓝藻铁氏束毛藻Trichodesmium thiebautii 主要出现在调查区东部水域表层。根据浮游植物物种和细胞丰度进行聚类分析后, 发现存在调查区东部与近岸2 个浮游植物分区。
|
| 关键词: 浮游植物 长江口 群集结构 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院知识创新重点方向项目(KZCX2-YW-213-2,KZCX3-SW-232); 国家自然科学基金项目(40676089); 国家重点基础研究发展规划项目(2006CB400605) |
|
| Phytoplankton assemblages in Yangtze River Estuary and its adjacent water in autumn, 2006 |
|
ZHAO Ran,SUN Jun,BAI Jie
|
| Abstract: |
| Water samples for phytoplankton were taken from grid survey stations around the Yangtze River Estuary and its adjacent water from November 7 to 21, 2006. Phytoplankton assemblages and cell abundance were reported in this paper. The primary phytoplankton group was diatoms and the secondary group dinoflagellates. There were also a few species belonging to Chrysophyceae, Chlorophyceae and Cyanophyceae, respectively. The dominant species were Thalassiosira rotula and Skeletonema costatum, respectively. The cell abundance of phytoplankton ranged from 0.13 to 59.69 cells/L with the average being 4.39 cells/L. The areas of high cell abundance were at the Yangtze River mouth and offshore of the survey area, respectively. The maximum phytoplankton cell abundance was at 20-m water layer. Section distributions were briefly described for S. costatum and T. rotula. The diazotrphic flora Trichodesmium thiebautii were mainly in the surface water of the eastern part of the survey area. Two phytoplankton provinces in the survey area were discriminated by cluster analysis of the phytoplankton assemblages.
|
| Key words: Phytoplankton Yangtze River Estuary Assemblage structure |
