MIGRATION OF BIOGENIC ELEMENTS FROM BOTTOM SEDIMENTS AS AN ADDITIONAL INTERNAL LOAD OF NUTRIENTS ON THE WATER BODIES OF THE URBAN AREA

There were investigated the seasonal and spatial dynamics of content nutrients in lakes Opechen’ system. It has been established that reservoirs urbanized territory, addition to external load, depends significantly on their migration from bottom sediments under oxygen deficiency reduction conditions. The concentration dissolved value redox potential within 0–16.2 mg/dm3 -129÷295 mV. Dissolved (0–5.4 0–44% saturation) transitional or conditions (-129÷69 mV) water horizon observed throughout year. increase (12.1–16.2 107–175% occurred only surface during spring-autumn period. ammonium nitrogen, nitrite nitrate ions varied 0–13.17, 0.006–0.186 0.016–0.142 mg N/dm3. inorganic phosphorus silicon reached 0.010–3.121 P/dm3 0.03–6.4 mg/dm3. near was always higher than horizon. This is due formation deficiency, conditions, which sediments. N:P ratio decreased winter autumn average range 7,2–2,6, indicates an relative nitrogen favorable for development blue-green algae. Favorable supply are formed when ?4 ?100 affect phosphorus, but relationship between studied indicators nonlinear. regime don’t silicon, its features diatoms.