The seasonal variation of phytoplankton,zooplankton and nutrients at a fixed sta-tion and in the Extended Gulf Stream System are studied by using a vertically averaged plankton model,respectively.

• 运用垂直平均值的浮游生物模型研究了在一个固定站和扩展湾流体系中，浮游植物、浮游动物和营养盐的季节变化。