ИСТИНА

The environmental assessment of soils prone to erosion includes generalization of individual assessments of 1) the intensity of water erosion of soil, 2) the intensity of wind erosion, and 3) the actual extent of the soil profile loss or gain due to erosion. All of them are generalized according to the rules of probability summation. The ecological state of the soil that lost the upper layer x can be assessed with the function of the form p = g exp (-A / (R (x)), provided that A and g coefficients and the R(x) function are known in advance. The R(x) relates the amount of soil loss to the thickness of the lost layer. The latter was determined based on the comparative study of profiles of both the eroded and the non eroded soils. The maximum value of the correlation momentum between the centered function profile data for the non eroded soil and the experimental profile data was used as the similarity criterion of the of compared profiles of the reference and the eroded soils. The function R(x) =a x^-b exp(-k/x) was deduced in which: a - is the scale factor, b - the coefficient of the R(x) decay rate, k - is the coefficient of the R(x) growth rate. This formula was proved to be adequate to the experimental vertical profiles of soil properties for some virgin and arable chernozems, gray forest soils, chestnut soils and meadow steppe and forest soils of the Russian Plane.