生物泵的运转效率决定着极地海域吸收大气CO2的能力，同时也是极地海洋对全球变化的重要反馈渠道。浮游动物是南大洋食物网中连接初级生产者和高级消费者的中间环节及生物泵的主要驱动者，我们前期研究结果显示基于海冰的变化南大洋普里兹湾浮游动物群落结构呈现显著的年际变动，而其对生物泵碳通量的影响亟待研究。本项目拟选取南极普里兹湾浮游动物优势类群南极磷虾、纽鳃樽、桡足类等做为主要研究对象，采取现场原位培养与沉积物捕获器时间序列样品采集相结合的方式，首次在南大洋海域尝试矫正浮游动物被动沉降（自然死亡的浮游动物尸体、残骸及蜕皮）对中层水生物泵碳通量的贡献，揭示浮游动物不同优势类群的粪便通量在海冰消退过程及海冰覆盖期间对生物泵效率的控制，阐述浮游动物不同优势类群对南大洋生物泵碳通量的贡献机制，为预测极地海域浮游动物群落变动对生物泵碳通量效率的影响提供理论依据，从而更好地探知极地海洋生态系统对全球变化的响应。

Efficiency of biological pump is crucial for the polar ocean’s ability to absorb atmospheric CO2 and also provides important feedback to global climate change. Zooplankton are considered as trophic links in the food web and biological pump of Southern Ocean that transfer carbon and energy from primary producers to higher trophic levels. Significant inter-annual variations of zooplankton community were found in Prydz Bay in accordance with the sea ice dynamics in our previous research. The impact of this process to the biological pump need further research in Southern Ocean. In this research, we would take the dominant zooplankton species, Antarctic krill, salps and copepods as the main research object and investigate the contribution of zooplankton to the biological pump in Prydz Bay based on combined approaches of field experiments and sediment trap. This work would be the first try to correct the contribution of passive sinking zooplankton (corpse, carcase and moult) to midwater biological pump in the Southern Ocean and expatiate on the control mechanism of fecal pellets from different zooplankton groups to the efficiency of biological pump during the ice retreat. The results of this work could provide us knowledge to forecast the impacts of zooplankton community dynamics to biological pump efficiency, which could help us better know the response of polar ecosystems to global change.