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依据2003年7月(丰水期)和2004年1月(枯水期)对长江口北支水域环境调查资料,研究了长江口北支水域浮游动物分布变化成因.结果表明,丰水期浮游动物生物量较高,平均为234.38mg·m-3,涨、落潮时分别为141.35和327.40mg·m-3;枯水期为188.81mg·m-3,涨、落潮时变化不大,分别为184.69和192.93mg·m-3;涨潮时长江口北支西侧水域生物量高于东侧,落潮时则相反;潮汐对种类数的影响不明显;多样性指数(H’)值涨潮大于落潮.丰水期涨潮时北岸生物量高于南岸,落潮时相反,而枯水期两岸差别不如丰水期明显.长江口北支浮游动物分布的变化与长江口门外浮游动物数量季节变动和潮流携带有关,与长江径流关系不明显.柯氏力通过潮夕作用,是长江口北支南北两岸生物量差异形成的重要原因.
Based on the environmental survey data of the Beizhi branch of the Changjiang Estuary in July 2003 (wet season) and January 2004 (dry season), the distribution of zooplankton in the Beizhi branch of the Changjiang Estuary was studied. The results showed that the zooplankton The average was 234.38mg · m-3, and the rising and falling tide were 141.35 and 327.40mg · m-3 respectively; the dry season was 188.81mg · m-3, and the changes were not significant at up and down trough, which were 184.69 and 192.93 mg · m-3. The biomass in the west side of the north branch of the Changjiang Estuary was higher than that in the east and that of the tide at the time of low tide was not significant. The influence of the tide on the species number was not obvious. The diversity index (H ’ The variation of zooplankton distribution in north bank of Changjiang Estuary is related to the seasonal variation of zooplankton population and tidal flow in the north bank of the Yangtze River estuary, The relationship is not obvious.Correll force through the tide effect, is the North Branch of the Yangtze River estuary north and south of the important reasons for the formation of biomass differences.