Dynamics of Phosphorus and Balance Estimate of Its Exchange Processes with the Bed in the Mozhaisk Reservoir during Vegetation Period

Data of complex offshore observations were used to analyze variations in the concentrations of mineral and organic phosphorus in the epilimnion and hypolimnion of the Mozhaisk Reservoir within the vegetation period. Vertical phosphorus fluxes at the hypolimnion boundaries were assessed by using the balance method with allowance made for the phosphorus transformations in the water mass within the vegetation periods considered. Destruction processes were found to proceed most intensely during the moderate blooming of phytoplankton, when these processes facilitate the formation of anaerobic conditions in hypolimnion, whereas exchange processes intensify abruptly in the periods of intense phytoplankton blooming and during its decline.