Influence of Landscape Organization on Surface-water Quality Forming on an Example of Ustya River Basin (Ukraine)

River ecosystems of Polissya are in a state of deep degradation. Agricultural lands, close to watercourses, are localized on the terraces of river valleys, in some places - floodplain. Such placement of lands in case of improper operation poses an ecological threat not only to the Ustya River, but also to the entire river system of the Goryn River, a tributary of which it is. With this in mind, the aim of our research was to assess the current hydrological, hydrochemical and hydrobiological condition of water bodies in the Ustya River basin, to identify the causes of possible deterioration and to justify measures to improve them. The ecological condition of the aquatic ecosystems of the Ustya River, in particular their soil cover, the granulometric composition of the basin and its contribution to the pollution of surface waters of the territory are determined in article. The ecological condition of the Ustya River basin is assessed and the main factors of anthropogenic changes of aquatic ecosystems within the Ustya River basin are determined, as well as the scale and consequences of their impact on water quality. The analysis of the processes of water quality formation within the water bodies of the Ustya River basin is carried out, the main directions of dynamics on three blocks of indicators are estimated and the integrated ecological indices of water quality in the observation points are determined. Solving the set tasks allowed us to comprehensively assess the ecological situation of landscapes in the Ustya River basin.