On the effect of hydrogen sulphide on primary productivity from retting area in Vembanad Lake, India

Abstract

Hydrographic studies on Vembanad Lake revealed the high pollution load of back waters and also indicates the irrecoverable damage of productivity. The result of this study indicates that quality of water in retting zone is highly deteriorated. A low value of primary productivity ranging from 0 to 2.48 mg C/l/d was observed in retting zone whereas productivity of non retting zone showed higher values ranging from 2.36 to 3.88 mg C/l/d. Hydrogen sulphide values in retting zone was low, ranging from 0 to 0.82 mg/L. But in the retting zone hydrogen sulphide concentration was high (0.63 to 3.83 mg/L).