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黄海冷水团水域浮游植物群落粒级结构的季节变化
Seasonal Variations of phytoplankton biomass size structures in Yellow Sea Cold Water Mass Area
投稿时间:2009-08-20  修订日期:2009-09-24
DOI:
中文关键词:  黄海冷水团  叶绿素  浮游植物粒级结构
英文关键词:Yellow Sea Cold Water Mass  Chlorophyll  Phytoplankton size structure
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)
作者单位邮编
傅明珠国家海洋局第一海洋研究所 266061
孙萍国家海洋局第一海洋研究所 
王宗灵* 国家海洋局第一海洋研究所 266061
李艳国家海洋局第一海洋研究所 
高春蕾国家海洋局第一海洋研究所 
李瑞香国家海洋局第一海洋研究所 
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中文摘要:
      本文根据2006~2007年度四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径结构的时空分布特征及季节变化规律。结果表明,研究海域30m以浅叶绿素总量的平均含量为春季(1.01 mg m-3)>夏季 (0.81 mg m-3)>秋季 (0.72 mg m-3)>冬季(0.68 mg m-3);在叶绿素浓度>1 mg m-3和叶绿素浓度<1 mg m-3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分别为春季(15.47 μm)>冬季(11.08 μm)>秋季(8.61 μm)>夏季(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体引起的光限制,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。
英文摘要:
      The spatio-temoral distributions and seasonal variations of phytoplankton chlorophyll biomass and its size structure in Yellow Sea Cold Water Mass were studied based on the four cruises conducted during 2006~2007. The results showed that the average chlorophyll concentration in the upper 30m layer was in the sequence of spring (1.01 mg m-3) >summer (0.81 mg m-3) >autumn (0.72 mg m-3)> winter (0.68 mg m-3). The phytoplankton size structures were significantly different between the area where Chl a >1 mg m-3and Chl a <1 mg m-3. In the whole region, smaller-sized nanophytoplankton and picophytoplankton dominated the biomass (>65%), while the contributions of microphytoplankton was relatively higher in winter and spring cruises. The average size index of phytoplankton were in the sequence of spring (15.47 μm)> winter (11.08 μm )> autumn (8.61μm) > summer (6.52 μm). The relationships between the total biomass and the contributions of different size fractions showed consistent trend in the four cruises in spite of the contrasting physical and chemical environments. Analysis of the relationships between the environmental factors and the chlorophyll concentrations showed the growth of phytoplankton was 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.
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