Dynamics of thermal, hydrochemical and hydrobiological characteristics of Lukoml SDPP cooling pond in winter period

The article discusses the features of the winter thermal, hydrochemical and hydrobiological regime of the cooling pond of the Lukomlskaya GRES – Lake Lukomskoe. The relevance of the study lies in the need to monitor the quality of water in the lake due to the activation of limnic processes due to thermal pollution. The purpose of the research was to study individual abiotic and biotic components of the ecosystem of Lake Lukomskoe for the period from 1972 to 2024.

In the ionic structure, it is noted that hydrocarbonates, as well as magnesium, sodium and chlorine ions, are characterized by the highest rate of entry and accumulation in the water mass of the reservoir, with a relative decrease in the content of sulfates and calcium. Among the biogenic elements, the most stable growth is demonstrated by the concentration of phosphorus.

Long-term studies of winter phytoplankton of the cooling pond indicate a relative constancy of the community structure and its dominant complex. Outbreaks of algae development in some years are largely due to weather conditions. The species composition and structure of the zooplankton community are currently typical for the winter period and correspond to reservoirs with low trophicity. The reduction in the total number due to rotifers and the growth of biomass, largely formed by large crustaceans, indicate a decrease in the rate of eutrophication of the cooling reservoir.

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