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Influence of forest vegetation on the properties of typical chernozem in the steppe zone is carried out comprehensively. When comparison of soil properties of natural forests, arable land and forest belts Saratov and Kursk regions, it was established that under the canopy of trees form a special hydrothermal conditions. We observed elimination overcrowded sites and a reduction of general density of horizons, improved soil structure and water-stability of aggregates/