黄海冷水团水域浮游植物群落粒级结构的季节变化

傅明珠; 孙萍; 王宗灵; 李艳; 李瑞香

黄海冷水团水域浮游植物群落粒级结构的季节变化

1.
国家海洋局第一海洋研究所,山东青岛 266061;国家海洋局第一海洋研究所海洋生态环境科学与工程国家海洋局重点实验室,山东青岛 266061;中国科学院海洋研究所,山东青岛 266071
2.
国家海洋局第一海洋研究所,山东青岛 266061;国家海洋局第一海洋研究所海洋生态环境科学与工程国家海洋局重点实验室,山东青岛 266061

基金项目: 中国近海海洋综合调查与评价专项课题(908-1-ST03);UNDP/GEF黄海大海洋生态系示范项目(E-I-ratiochgdemo-2135)。

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出版历程
- 收稿日期: 2009-08-20

Seasonal variations of phytoplankton community size structures in the Huanghai(Yellow) Sea Cold Water Mass area

1.
First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Key Laboratory of State Oceanic Administration for Science and Engineering for Marine Ecological Environment,First Institute of Oceanography,State Oceanic Administration,Qin
2.
First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Key Laboratory of State Oceanic Administration for Science and Engineering for Marine Ecological Environment,First Institute of Oceanography,State Oceanic Administration,Qin

摘要

摘要: 根据2006—2007年度4个季节航次的实测资料,分析了黄海冷水团水域浮游植物叶绿素及其粒级结构的时空分布特征及季节变化规律,结果表明,在研究海域30 m以浅叶绿素总量的平均含量从高到低的顺序为:春季的(1.01 mg/m³)、夏季的 (0.81 mg/m³)、秋季 (0.72 mg/m³)、冬季(0.68 mg/m³);在叶绿素浓度大于1 mg/m³和小于1 mg/m³的区域浮游植物粒级结构差异较大,在整个研究海域,粒径较小的微型和微微型浮游植物对总生物量的贡献始终占主导(>65%),粒径较大的小型浮游植物在冬季和春季贡献率相对较高;从季节尺度看,浮游植物的平均粒级指数从大到小的顺序为:春季的(15.47 μm),冬季的(11.08 μm),秋季的(8.61 μm),夏季的(6.52 μm);尽管不同季节水文和化学环境差异显著,但是不同粒径浮游植物的贡献率随总生物量的变化表现出一致性的规律。对环境因子与叶绿素分布的相关分析表明,浮游植物的生长在夏季主要受到营养盐来源的限制,冬季主要受到水体混合引起的光照限制,秋季可能受到磷酸盐和水体混合的共同限制。浮游植物粒级结构的分布格局主要是由各组分在不同环境中的资源竞争优势决定的。
- 黄海冷水团 /
- 叶绿素 /
- 浮游植物粒级结构
Abstract: The spatiotemoral distributions and seasonal variations of phytoplankton chlorophyll biomass and its size structure in the Huanghai(Yellow) Sea Cold Water Mass were studied based on the four cruises during 2006—2007. The results show that the average chlorophyll concentration in the upper 30 m layer is in the order of spring (1.01 mg/m³) greater than summer (0.81 mg/m³) greater than autumn (0.72 mg/m³)greater than winter (0.68 mg/m³). The phytoplankton size structures are significantly different between the area where Chl a concentration is greater than 1 mg/m³and less than 1 mg/m³. In the whole region, smallersized nanophytoplankton and picophytoplankton dominated the biomass (>65%), while the contribution of microphytoplankton was relatively higher in winter and spring cruises. The average size index of phytoplankton is in the order of spring (15.47 μm) greater than winter (11.08 μm) greater than autumn (8.61 μm) greater than summer (6.52 μm). The relationships between the total biomass and the contributions of different size fractions show consistent trend in the four cruises in spite of the contrasting physical and chemical environments. The analysis of the relationships between the environmental factors and the chlorophyll concentrations shows that the growth of phytoplankton is limited by the nutrients availability in summer and by the weak light conditions caused by vertical mixing in winter. Phosphorus limitation and vertical mixing might be collectively responsible for the low chlorophyll level in autumn. The distribution patterns of phytoplankton size structures were mainly determined by their relatively competition advantages in different environments.
- Huanghai(Yellow) Sea Cold Water Mass /
- chlorophyll /
- phytoplankton size structure

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