PRIMARY PRODUCTIVITY OF THE SUBHAS SAROBAR LAKE IN EAST CALCUTTA IN RELATION TO SOME SELECTED PHYSICO-CHEMICAL PARAMETERS.T. SAHA, N. K. MANNA, S. SOM MAJUMDER AND I. N. BHATTACHARYA.Abstract A year round study of primary productivity in Subhas Sarobar lake, East Calcutta has been conducted. Mean values of gross productivity (GPP), net primary productivity (NPP) and community respiration (CR) ranged from 510-1016 mgC/m3/hr, 270-921 mgC/m3/hr and 95- 377 mgC/m3/hr respectively. Correlation coefficients were computed between GPP, NPP and CR and physico-chemical parameters studied. Water temperature and total alkalinity showed significant direct correlation with GPP and NPP of the lake. The primary productivity values revealed that the lake water was mesotrophic.
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