The relationships between the electrical resistivity and the properties of hydromorphic saline soils forming in a humid climate were established. The salinity factor turned out to be the most significant for the value of electrical resistivity compared to soil texture and organic matter content.
Over the last 30–40 years, climate changes have resulted in environmental changes within the Upper Volga basin. In this study, an attempt to analyze the soil record of recent climate changes was made. An example of soil evolution induced by climate change was studied on hydromorphic saline soils in the nature reserve of the Varnicy Saline Spring. In a humid climate, soil salinization occurring in discharge areas can quickly change in response to the changed hydrothermal regime because of close relationships between climatic conditions and groundwater systems. In a poorly drained depression, we could observe an increasing soil salinity and developing hydrogenic accumulation of salts, whereas the groundwater salinity was stable.