Study on the ecological characteristics of phytoplankton in Jiuzhen Bay

This paper was based on the data from phytoplankton net samples collected in Jiuzhen Bay during the period of May,August,November 2001,the horizontal distribution and seasonal variation of the species composition and cells abundance of phytoplankton were discussed,and their relation to the environmental factors were studied.The results showed that there were 131 species belonging to 46 genera(3 phylums) of phytoplankton in investigational area,the mean value of the total number of phytoplankton was 2.18×105cell/m3~5.75×107cell/m3,and the average cell number was 2.02×107cell/m3,the maximum appeared in May 2001 and its minimum appeared in November 2001.The composition and abundance of the phytoplankton had correlation with water temperature,salinity,concentrations of DIN and PO4-P,and the quantity of cultural shellfishes.