Survey on Organic Matter Accumulation in the Anzali Lagoon Sediments

Organic matter was determined in different parts of lagoon sediments during three years with annual average Of 137.32 ± 28.60 milligram in one gram dried sediment. Seasonal and horizontal fluctuations range was very clear and varied between maximum amount in emergent macrophytes region (in March, 250.00 mg/g. d.w.sed.) and minimum value in river systems (in September, 152.25 mg/g. d.w.sed.). This high organic matter is best reason for eutrophication process with regard to huge concentration of emerge, floating and submerge plants as a pollutant negative factor in spite of Caspian Sea's water level. Allochthonous matter from eleven important rivers and Authochthonous matter within lagoon during biological activities has main role in appearance of high eutrophy and it's need one scientific solution for this problem......