ИСТИНА

Water bodies of reserved areas are the important water resources of Russia regions. However, in many reserves there isn’t scientifically reasonable monitoring system of their water bodies. It makes difficult complex investigations of their ecological condition under the changing anthropogenic load and possible climate variability. In the framework of our investigations a system of hydrological monitoring has been developed using as an example of the northern area of the “Valdaisky” National Park. A set of indicators and parameters characterizing the hydro-ecological conditions of water bodies has been developed based on the results of field work. The monitoring data were into a database created as а part of the State Water Cadastre. Thematic computer maps and a cadastre of the water bodies have been created for the entire territory using GIS methods and satellite imagery. Some hydrographic features of the lakes of the Valdai lake region have been estimated and compared with the lakes of the Belorussia lake region. Some changes in the structure of the anthropogenic pressure have been studied. The reduction of the agricultural pressure on the catchments has been identified at the backdrop of some substantial increase of the recreational and domestic pressure. The dominant role of the morphometric and landscape factors has been identified based on the analysis of the seasonal variability of the content of biogenic and organic substances and the oxygen regime in the water bodies. Some recommendations on the creation of a monitoring system that would be optimal from the economic and informational point of view have been presented to monitor of the water bodies of the Borovno–Razliv lake–river basin.