Phosphorus in the Sediments of the Lake Onega
The current distribution of phosphorus in the sediments of the Lake Onega is studied. It is shown that the dynamics of the changes in its contents during the observation period 1975-2012 corresponds to the nature of the changes in the external phosphorus load and eutrophication processes of the reservoir. The estimation of the internal phosphorus load depending on the sediment type and the extent of human influence has been done. The study of geochemical features of the accumulation of phosphorus in the sediments showed that the main mechanism of retention of phosphorus in the sediments of the Lake Onega is the sorption processes on iron hydroxides in the redox barrier.