To investigate the relationship between optical density ( od ) and the biomass of phaeocystis globosa . p . globosa was used under laboratory conditions to study the relationship between the cell density and its related od 在实验室中测定棕囊藻细胞密度及光密度( od值)并进行直线回归分析,同时采用光密度值来估算棕囊藻的生物量。