摘要
基于2009年6月11—16日闽粤近岸(21.6°—24.3°N,115.7°—118.7°E)30个站位133个样品的调查资料,对闽粤近岸上升流区浮游植物群落的物种组成、丰度变化进行了三维结构(水平、垂直、断面)研究,并探讨其与下层水涌升、营养盐补充的关系.共记录浮游植物4门85属159种,以及未定种9种.其中,硅藻为优势类群,甲藻次之,以束毛藻为主要组分的固氮蓝藻也占有较大比例,而金藻仅在近岸10 m上层检出.细长翼根管藻、菱形海线藻、尖刺伪菱形藻、中肋骨条藻、佛氏海线藻、具槽帕拉藻、斯氏几内亚藻、铁氏束毛藻、纺锤角藻和旋沟藻为群落的优势种.调查区内浮游植物以广温种为主,其次是暖水种,而热带高盐和外海广温种较少.浮游植物细胞丰度平均为每升67.59×102个.浮游植物垂直分布的总体特点是丰度在表层最大,随着水深增加逐渐减小.浮游植物细胞丰度的平面和断面分布不均匀,密集区出现在南澳岛邻近海域,与上升流中心重合.上升流强度较弱或在涌升早期阶段,浮游植物细胞丰度增长不明显,密集区位于或邻近上升流中心.南澳岛至漳浦一线海域的4条断面(B、C、D、E)浮游植物细胞丰度值较高,存在经由台湾浅滩的陆架海流向近岸的上涌现象.10 m上层浮游植物细胞丰度与磷酸盐(PO43-)呈显著正相关,幂函数拟合最佳,与无机氮盐(DIN)没有显著的相关关系.对浮游植物营养盐胁迫的生理生态学研究有助于理解上升流区浮游植物的细胞丰度变化和水华的形成.
Based on the investigation data of 133 samples from 30 grid stations in the Fujian-Guangdong coastal upwelling region（21.6°-24.3° N,115.7°-118.7° E） in 11-16 June 2009,this paper studied the phytoplankton species composition and cell abundance in the region in three dimensions（vertical,horizontal,and sectional）,and approached their relations with major environmental factors.A total of 159 taxa belonging to 85 genera of 4 phyla were identified,among which,diatom was predominant,followed by dinoflagellate.Cyanophyceae mainly composed of Trichodesmium also occupied a greater proportion,but Chrysophyceae was only checked out in the upper 10 m water layer at coastal stations.The dominant species were Rhizosolenia alata f.gracillma,Thalassionema nitzschioides,Pseudonitzschia pungens,Skeletonema costatum,Thalassionema frauenfeldii,Paralia sulcata,Guinadia striata,Trichodesmium thiebautii,Ceratium fusus,and Gyrodinium spirale.Most of the phytoplankton taxa were cosmopolitan species,followed by warm-water species,while tropic high-salinity or oceanic eurythermal species were lesser.The cell abundance of the phytoplankton was average of 67.59×102 ind·L-1.In vertical profile,the cell abundance of the phytoplankton was the highest in surface water,and decreased with water depth.In horizontal and sectional profiles,the cell abundance had no definite patterns,but the high abundance region was in Nanao Island water area,being anastomosed with the center of upwelling region,which indicated that the weak and small intensity of deep-sea water upwelling caused lesser phytoplankton cell abundance and superposition.The comparatively high phytoplankton cell abundance in the four sections（B,C,D,E） along Nanao-Zhangpu was resulted from the upwelling from Taiwan Bank.The phytoplankton cell abundance had a significant positive correlation with the PO43-concentration in the upper 10 m water layer,but no correlation with the dissolved inorganic nitrogen（DIN） concentration.Thereby,to study the eco-physiological responses of phytoplankton species to nutrient stress would be helpful to reveal the formation mechanism of algal bloom in upwelling region.
出处
《应用生态学报》
CAS
CSCD
北大核心
2011年第2期503-512,共10页
Chinese Journal of Applied Ecology
基金
国家"908"专项(908-01-BC08
908-ZC-Ⅱ-02
908专项海洋生物样品库)
科技部基础性工作专项(2006FY220700)
国家海洋局第三海洋研究所基本科研业务基金项目(海三科2009031)
国家海洋局青年海洋科学基金项目(2009130)资助
关键词
闽粤近岸上升流
浮游植物
物种组成
细胞丰度
断面分布
营养盐胁迫
Fujian-Guangdong coastal upwelling region
phytoplankton
species composition
cell abundance
section profile
nutrient stress.
