Thermophysical properties of lowland Histosols of the Upper Volga woodland (on the example of the Yakhroma river valley)

Abstract

Abstract Annotation. The dependence of thermal diffusivity on volumetric humidity for Histosols developed on wood peat, underlain by sediment peat and mineral peat, was studied using Histosols from the Yakhroma Valley (Moscow Region). The determination was carried out at the stages of dreinage and humidification by the laboratory method of Kondratiev. For the stage of draining, the dependence has a more pronounced dome-shaped form than for the stage of saturation. The highest values of thermal diffusivity were achieved with a volumetric soil water content of 50-55% for Histosols on wood peat and 40-45% for agromineral peat. The approximation of the data was carried out according to the equation of Chang and Horton. As a result of comparing the approximation parameters, it was revealed that they do not significantly differ from each other, which indicates the absence of hysteresis of the thermal diffusivity from humidity for the thermal diffusivity curve, the unambiguous values of which can be used to simulate the temperature regime.