SIMULATION OF THE THERMO-PHYSICAL CURVE OF POST-PYROGENIC SOD-PODZOLIC SOILS OF THE NORTH-EASTERN PART OF BELT PINE FORESTS OF THE ALTAI REGION
In mathematical simulation of soil temperature field one should know such thermo-physical coefficients as heat capacity, thermal conductivity or thermal diffusivity which depend on a number of soil physical properties and particularly on soil moisture. What is of the most practically significant interest is the study of the dependence of the thermal diffusivity on moisture, i.e. thermo-physical curve since it is included in the general thermal conductivity equation used in the mathematical simulation of heat propagation in the soil. This work studies the thermo-physical properties in the profile of sod-podzolic soils formed under a belt pine forest. The obtained experimental thermo-physical curves are approximated by the 4-parameter function of T.A. Arkhangelskaya. This function describes the experimental thermo-physical curves quite accurately. In post-pyrogenic soils due to humus loss, there occurred the reduction of the parameters θ <sub>0</sub> and b with the approach of their values ​​to those of the underlying horizon. The obtained calculated parameters enable to identically characterize the changes in soil heat exchange properties that have occurred under the exposure to fire and also use these parameters in the simulation of soil temperature regime.