本项目拟采用海上现场观测和培养、室内生态试验相结合，通过研究南海北部海域海水中溶解铝（Al）与浮游植物种群、粒级结构的动态变化和海洋初级生产力的关系；溶解铝Al的不同浓度和特定形态对不同类群浮游植物生长的影响；以及Al和其他生源要素（N、P、Si）等对浮游植物的生理协同作用；弄清铝对不同种群、粒级浮游植物的生长效应及利用途径，鉴别认识浮游植物不同类群对Al的吸附或同化作用，并探讨Al对浮游植物的营养机理，探索Al在赤潮生消过程中的作用，为研究大气沉降的Al在海洋生物泵和碳循环中的作用提供理论依据。

The project intends to study the relationship between dissolved aluminum (Al) concentration and phytoplankton community construction, size fractionated base structure and primary productivity in the Northern South China Sea, as well as effects of different concentrations of dissolved aluminum (Al), the specific form of Al on the growth of different taxa of phytoplankton, and the dynamic changes in size structure. We will focus on Al and other biogenic elements (N, P, Si) co-effects on phytoplankton growth, to stress if phytoplankton assimilating or absorbing aluminum, to identify and understand the physiological channels of different phytoplankton groups to use different Al type, and to explain why Al can serve as a nutrient for different phytoplankton taxa or size. That will allow us to better understand the role of Al in the marine biological pump and the carbon cycle. Field observations， in situ incubation and ecological experiments in lab were adopted in our project.