MULTIYEAR DYNAMICS OF TRANSBOUNDARY INFLOW OF BIOGENIC COMPOUNDS ALONG THE ILE RIVER AND ITS TRANSFORMATION ALONG THE RIVER COURSE

Abstract

The paper presents the results of studies devoted to the assessment of the long-term dynamics of the volume of transboundary inflow of biogenic compounds to the territory of Kazakhstan along the Ile River. Based on long-term data from the State Monitoring of RSE «Kazhydromet,» the peculiarities of the transformation of the flow of biogenic compounds (nitrogen and phosphorus) along the river course, considering the influence of natural and anthropogenic factors, are analyzed. Information about the importance of studying biogenic substances in the formation of surface water quality, as well as river runoff’s role in the biological productivity and sanitary regime of final water bodies, is provided. The role of the transboundary flow of the Ile River as the main factor in forming the biogenic substances regime on the territory of Kazakhstan is highlighted. A quantitative assessment of the volume of average annual inflow of these compounds for the period from 2003 to 2020 is given, along with the main factors determining the transformation of nutrient runoff along the river course.