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[B-5.1 Potential of carbon fixation by marine phytoplankton]

[Contact Person]

Masataka Watanabe
Division of Water and Soil Environment,
National Institute for Environmental Studies
16-2 Onogawa, Tsukuba, Ibaraki 305 Japan
Tel +81-298-51-6111(Ext. 330), Fax +81-298-56-4680

[Total Budget for FY1990-1992]

34,055,000 Yen

[Abstract]

　A large scale axenic culture tank was used in order to understand the causative relationship between the growth of phytoplankton and the variation of CO₂ concentration in atmosphere. Variations of Organic carbon and inorganic carbon in sea water and absorption of atmospheric CO₂ into sea water had been measured in the tank in detail. About 17% of assimilated inorganic carbon was excreted from the cells as dissolved organic car-bon, which is very important for the production of DOC in the surface layer of the ocean. It was found that the growth of C. antiqua was limited by available [H₂CO₃^*] instead of [HCO₃^-].

[Key Words]

Marine microcosm, ocean carbon cycle, Marine phytoplankton, carbon fixation