Mathematical models of thermal diffusivity in solonetz soils in the Trans-Volga region of Volgograd oblast

Two empirical models have been developed describing the relationship between the thermal diffusivity in soils and their properties in the solonetzic complex. The first model represents a regressive relationship between the thermal diffusivity and the most dynamic parameters (moisture, density, and their derivatives) of the soil physical status. The second (more comprehensive) model is based on the first one and takes into account the properties that appear to be the most informative about the variation of the heat transfer velocity along the solonetz profile, i.e., the indices of the particle-size distribution (the content of physical clay and fine and medium silt); the content of humus, easily soluble salts, and carbonate CO2; and the total alkalinity index.