IMPACT OF SOILS IN MICRO-DEPRESSIONS ON AGROLANDSCAPE STRUCTURE IN THE WEST SIBERIAN FOREST STEPPE

Results are given from research into impact of soils in micro-depressions within the agrolandscapes of the West Siberian forest steppe on their structure. The research was conducted in areas differing in agrolandscapes: areas near the Ob, Baraba central and southern forest steppe in Novosibirsk Region, subtaiga in Tomsk Region. The contrast range of textural and differentiated soils (Luvisols, Planosols and Epigleyic Phaeozems according to World Reference Base) that occupy the micro-depressions has been determined. These soils are oppositely different from background soils such as arable Greyic Phaeozems and Chernozems. The highest contrast range of micro-depression soils is observed in the central and southern forest steppe areas in Barabinsk, Novosibirsk Region. The contrast range decreases in the direction of east and north owing to increase in proportion of grey soils in the background. Most areas of soils in the micro-depressions within the territory studied are of monolithic structure, except for the Priobskoye plateau, where medium and strongly dissected areas of elongated branched shape are observed. More than 90 percent of micro-depressions have very small area of less 5 ha, and only in the south they reach medium size (more than 10 ha). The greatest part of the territory (27.1 %) is occupied by soil areas of the micro-depressions in the subtaiga agricultural zone of Tomsk Region. Agricultural landscape in question is characterized by complex inner configuration of the fields that makes tillage more complicated. The least complicated agrolandscape is the southern forest steppe. Micro-depressions here occupy only 5.6 percent of total area that defines this territory as most suitable for tillage. The regularities revealed are directly associated with changes in soil formation conditions, in particular, with enhancing climate aridization.

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