Complexity assessment of the soil covers of the Krasnoyarsk forest-steppe agrolandscape

The purpose of the work is to map and analyze the structure of the soil cover of the agricultural landscape in the Krasnoyarsk forest-steppe for the typification of its elementary elements in the formation of a regional information and reference system for the optimization of agriculture. The studies were carried out in the central part of the Krasnoyarsk forest-steppe (56°25”N and 92°53”E) on a plowed area with a total area of 9 hectares. The map of soil covers structure was plotted by means of GIS MapInfo Professional. The heterogeneity of the soil cover of the site was assessed by the magnitude of the contrast, which was calculated by comparing the agronomic and production properties of each soil with the most common one. For comparison, we used the degree of leaching and podzolization, particle size distribution, thickness of the humus horizon, degree of humus content, moisture conditions and erosion. The structure of the soil cover is characterized by a combination of spotting and small-contour elementary areas (ESA). The composition of elementary soil structures (ESS) varies depending on the proportion of the accompanying components. The background soils in all combinations are clayey-illuvial agrochernozems, shallow. They are everywhere accompanied by cryogenic-micellar agrochernozems. The third component in three-component combinations is represented by thick clay-illuvial agrochernozems and medium-thick clay-illuvial podzolized agro-chernozems. It was shown that the ESS contrast is weak, but in general the combination is medium contrast (the contrast score on the Friedland scale is 1.5). The greatest differences between the soils of the experimental site are in the degree of leaching, the thickness of the humus horizon and erosion. According to the sum of exchange bases, all soils belong to the same group. The most contrasting is the clayey-illuvial hydrometamorphosed agrochernozem, which forms in a wide hollow under conditions of increased moisture and accumulation of soil particles carried by temporary watercourses. Thus, the greatest contribution to the enhancement of contrast is made by the unequal susceptibility of soils to erosion processes, which must be taken into account when land managing the territory, developing farming systems and technologies for the cultivation of agricultural crops. In addition, the soil cover structure (SCS) map of the experimental field is recommended for use as a cartographic basis for agrochemical survey and subsequent fractional fertilization.