lake-basin system

Purpose. To reveal the peculiarities of geo-ecological status of the lake-basin system (LBS) of Ozerians-ke lake for the needs of a balanced nature management. Methods.The research is based on methods of field instrumental landscape-geochemical searches using modern geoinformation technologies and laboratory-analytical diagnostics of soil, water and lake sediments. Results. The current state of economic development of the catchment of Ozerianske lake has been clari-fied. The results of the research of the hydrochemical composition of lake water have been presented. The results of the experiments with the determination of the content and features of radial, lateral migration of mobile forms of biogenic elements (N, P2O5, K2O) and heavy metals (Co, Pb, Cd, Cu, Zn, Mn) on a landscape soil geochemical microcatena within the catchment area of a lake have been analyzed. A slight excess of MPC in the content of Mn and Cd in the soils of the microcatena has been fixed. The feature of lateral migration of biogenic elements is the increase of their concentration from the eluvial to the superequal facies of the geochemical microcatena, and the radial feature is the decrease of their content with the depth of the soil profile. Moving forms of heavy metals (Co, Pb, Cd, Cu, Mn) are characterized by radial migration - increasing their content with the depth of the soil profile in the horizon (20-40 cm), and further towards the parent rock, their concentration mainly decreases. Conclusions. It was established that the catchment area of Ozerianske lake refers to the anthropogenic-natural (IV) type and has unsatisfying geo-ecological status. In order to improve the geo-ecological status of the catchment area, it is advisable to gradually increase the area of ecostabilizing lands (meadows, forests, forage areas); to control the application of mineral fertilizers and pesticide use, and to prohibit the plowing of land by a 50-100-meter coastal protective strip around the lake.

Purpose. To substantiate the features of the landscape-geographic model of the ecological passport of the lake basin for the needs of preserved and recreational nature management. The article is focused on the acute need in development of ecological passports of local environmentally protected sites for formation of a regional inventory of nature reserve fund. The concept of a natural aquatic complex (NAC) of the lake, a lake-basin system (LBS) served as a methodological basis of the proposed work. The research is based on the methods of field instrumental landscape-limnological searches with the use of laboratory diagnostics of soil samples of the catchment and bottom sediments of the lake, and the landscape-based analysis of the LBS. The results of the study are presented in the form of landscape models of NAC of Ozertse lake and the natural territorial complexes (NTC) of the catchment. Landscape complexes of the rank of a tract and aquatic facies are allo-cated in the OBS of Ozertse lake. The geochemical features of the bottom sediments of the water body on the example of one of the points of sounding, hydrological and morphologic-morphometric parameters of NAC of the lake and its catchment, and the landscape-metric characteristics of the integrated lake-basin system are analysed. Conclusions. The developed landscape-geographic model of the lake basin system will be a base for the ecological passport of Ozertse lake. Ecological passports of such type are needed for ecological, tourist-recreational, water management and land reclamation institutions and establishments, as well as for the newly formed united territorial communities.