PHYTOMELIORATIVE INFLUENCE OF THE MACROPHYTES OF DIFFERENT ECOLOGICAL GROUPS OVER THE OXYGENE REGIME IN THE TECHNOGENIC LAKES OF THE SMALL POLISSYA OF UKRAINE

The article presents the results of determining the characteristics of the oxygen regime in the macrophytes thickets of different ecological groups: of submerged (Cerat ophyllum demersum L.), floating (Potamogeton natans L., Nuphar lutea (L). Smith.) and air-water (Phragmites australis (Cav.) Trin. ex Steud.) in technogenic lakes of Small Polissya of Ukraine. Physiographic area of Small Polissya located mainly in the western regions of Ukraine, and a small part – in Poland, and differs plain relief, high humidification, closeness of groundwater from surface. Technogenic lakes were formed by sand mining using dredges as result underwater extraction in aqueous career. They have an age of between 30 and 60 years, can be flow-through and non-flow-through. Soluble oxygen, temperature and oxygen saturation were measured by the device Oxi 330i/SET. The largest concentration of oxygen is determined in areas of lakes occupied by submerged vegetation. In thickets of air-water and floating vegetation the oxygen content is almost identical and with the depth it gradually decreases. In the thickets macrophytes the oxygen regime is affected by the degree of flow-through and age of lakes. In the «younger» non-flowing lakes of 30-35 years of age the oxygen concentration is the largest, the lowest oxygen concentration is in the old lakes. According to the determination of dissolved oxygen at different depths and in the bottom layer we proved an active development of eutrophication processes in non-flowing technogenic lakes aged about 60 years.

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