The following tasks are considered: temperature distribution in the soil having non-uniform structure of soil layers; definition of heat-physical characteristics of the soil - a thermal capacity, heat conductivity and heat diffusivity of lixiviated chernozems in the Altai Priobjya. Questions of determination of heat-physical coefficients are investigated at various values of humidity for soil layers; daily and seasonal course of the heat-physical characteristics depending on humidity and density of the soil are researched too.

Key words: model, soil thermal regime, soil thermal capacity, heat conductivity of the soil, thermal diffusivity of the soil.