Variation entry of sediment, organic matter and different forms of phosphorus and nitrogen in flood and normal events in the Anzali wetland

Abstract Phosphorus (P), nitrogen (N) and organic component are released from the soil into surface bodies by runoff erosion, causing pollution eutrophication of water resources. This study aimed to investigate seasonal changes in loads N P components, matter (OM) Pasikhan River flood normal conditions. Sampling was performed monthly during flow conditions for five events. The concentrations components were measured samples. OM suspended sediments determined combustion method. Under flows, maximum total about 0.553 mg l?1 (STD = 0.11) (November) 3.41% 1.17) autumn, respectively. concentration 0.533 0.12) observed winter. In events, TP, TN ranged 0.48 3.5 l?1, 0.28 0.79 1.24 4.11%, results indicated a high risk River. Also, revealed that severe event, some 113.9 tons h?1 can be river watershed. Furthermore, there correlation between amount losses with different Finally, it is concluded if floods not controlled, they only cause rapid loss nutrients but also lead Anzali wetland.