Abstract
Soil is a specific natural body, which is characterized by a number of features due to which it differs from living organisms and rocks. One of these features is its thermal properties. The most important thermal properties of the soil are thermal conductivity, thermal capacity and thermal diffusivity, which reflect the specific features of the set of properties inherent in different soils. As a result of the studies, the existence of a direct relationship between the values of thermal conductivity and thermal diffusivity of Calcic Chernozem and the content of the silt fraction in them, as well as between the thermal capacity and the content of organic matter in them. The established relations do not appear clearly in Luvic Chernozem and Chernic Phaeozem. The maximum thermal properties for Luvic Chernozem and Chernic Phaeozem were found in the eluvial horizon, which in the lower part borders on the illuvial horizon. The eluvial horizons of Luvic Chernozem and Chernic Phaeozem are characterized by lower thermal properties compared with the illuvial horizons. The thermal properties of soils can be used to clarify the distribution characteristics of the silt fraction and organic matter along the profile, as well as determination of the intensity of eluvial-illuvial processes. The establishment of these soil features is an important characteristic of their soil genesis, which is especially important for chernozem soils under forest vegetation.
Highlights
The thermal properties of the soil are its important characteristic, which determines the accumulation and movement of heat in the soil, and affects the temperature and heat flux in the soil depending on time and depth (AbuHamdeh, 2003)
A direct relationship was established between the values of thermal conductivity and thermal diffusivity of Calcic Chernozem and the content of silt fraction in it
A direct relationship was found between the thermal capacity of Calcic Chernozem and the content of organic matter in it
Summary
The thermal properties of the soil are its important characteristic, which determines the accumulation and movement of heat in the soil, and affects the temperature and heat flux in the soil depending on time and depth (AbuHamdeh, 2003). It was found that thermal conductivity increases with increasing soil density and moisture content. The research results of Vidana Gamage et al (2019) indicate that the thermal properties of the soil are more dependent on the moisture content in it than on the content of organic matter and structural-aggregate composition. Other scientists cite data that the thermal properties of the soil are mainly determined by the total content of organic matter, and not by its structural-aggregate composition, bulk density and moisture (Zhu et al, 2019)
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