STUDY ON THE CARBON ASSIMILATION RATE OF PHYTO-PLANKTON IN THE UPWELLING REGION IN MINNAN-TAIWAN BANK FISHING GROUND
闽南-台湾浅滩近岸上升流区浮游植物碳同化速率的研究

Photosynthetic rates of phytoplankton were determined in situ with 14C-Iracer method. The constants of carbon assimilation rate of phytoplankton were calculated for samples collected from different depths in various seasons, combined with the data of carbon contents in algal cells. The effects of environmental conditions on the constant of carbon assimilation rate of phytoplankton were discussed. The results indicated that the formation of the coastal up welling in Minnan-Taiwan bank fishing ground was the major factor for the high productivity in this sea area. Doubling time of phytoplankton during the upwel-ling period was 1.8 times less than that during the non-upwelling period. In addition, temperature, light intensity and nutrients were also the important factors contorolling the growth of the phytoplankton. The maintenance of higher nutrients was one of the reasons for larger constant of carbon assimilation rate of phytoplankton(3.3d-1). The optimum light intensity for the growth of phytoplankton in this sea area ranged from 3000 to 15000lx. The effect of temperature can be approximately described with the model of Goldman and Carpenter.