On the basis of theoretical analysis of literature and data obtained from monitoring the problem of two dimensional interdependent heat-mass transfer in the soil top layer accounting for the exchange of heat and moisture with a soil air stratum have been formulated. Regularities in the temperature and moisture modes changes in the top layer of soil were observed in monitoring and a computer simulation method was elaborated. A considerable amplitude of daily temperature fluctuations on the ameliorated peat soil surface can be one of the basic reasons for the degradation of ameliorated peat soils.