On assimilation and regeneration of phosphorus in two different environments

M.D. Rajagopal


Samples of water collected from marine and estuarine environments were inoculated with phytoplankton organisms. The rates of regeneration of phosphorus were measured under laboratory conditions from phytoplankton decomposing in the dark. The observations were carried out for a period of five months and the changes were recorded between 15th and 60th day after darkening the system. Maximum recorded rate of regeneration was 0.094 mu g-at PO4-P/1/d1. The marine sample was found to be more efficient than the estuarine sample in their phosphorus regeneration capacity. Mineralization was almost complete after 100 days indicating that it may cease after that period as it is dependant on the components of plankton which almost get exhausted within that time. After 150 days, about 70% of the phosphorus was observed in dissolved inorganic state


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