The influence of the lithological factor of soil formation on the properties and composition of soils in the broad-leaved forest of the forest-steppe zone of the Volga region

The study of soils with the compilation of a soil map of a broad-leaved forest "Natural plantations of oak" (hereinafter referred to as the NPO) in the Komsomolsky District of the Chuvash Republic (forest-steppe zone of the Volga region) was carried out for the first time. The time of research is summer 2017. The relief is a weakly undulating watershed of the Volga Upland. The woody and shrubby vegetation of the reserve is represented mainly by an oak of different ages, linden, maple, and rarely spruce. Of the factors of soil formation, only the soil-forming rock and the relief change. Of the factors of soil formation, only the soil-forming rock and the relief change. The soil cover of NPO is represented by Glossic, Albic, Dystric Retisol on Jurassic clay eluvium and Glossic, Albic, Dystric Retisol on Jurassic clay eluvium soils, Glossic, Albic, Dystric, Stagnic Retisol on Jurassic clay eluvium, Glossic, Greyzemic, Luvic Phaeozems on Cretaceous clay eluvium, and Glossic, Greyzemic, Stagnic, Luvic Phaeozems on Jurassic clay eluvium. The humus horizons have a low content of humus and plant nutrients.