Home – Home – Jornals – Geography and Natural Resources 2020 number 5S

It is shown that in conditions of global warming the lakes of the steppes of the Onon-Argun interfluve, which are the exten sion of the steppes of Mongolia and China, are experiencing a severe degradation, even to the point of emerging solonchaks in their place with a high degree of salinization (more than 4 % from the surface). Their number decreases with depth, similar to the CaCO3 distribution. In the early stage of formation of solonchaks, their composition, and also the water, is dominated by soda and sodium sulfate, and the amount of chloride and calcium is decreased. Subsequently, the dry bottom of the lake trans forms to the hilly-erosion surface. Aeolian hillocks are depleted in soda and chlorides. The composition of the salts of the surface, complicated by erosion furrows, is dominated by sulfate and sodium chloride. With the passage of time, under the effect of wind and storm rainfall, the amount of salt decreases and saltwort encroaches onto the dry bottom. A reduction in the water surface enhances the dryness of the air and influences the local rise of temperature.