POST-AGRARIAN TRANSFORMATION OF GEOSYSTEMS OF THE TUNKINSKAYA DEPRESSION (REPUBLIC OF BURYATIA)

To identify features of natural reforestation after abandonment of land, this paper considers the current state of 22 sites of fallow lands of the Tunkinskaya depression (Republic of Buryatia). The species composition of tree and ground covers was revealed during the overgrowing of arable land on the basis of the geobotanical analysis. The landscape specificity of the main agrarian regions of the Tunkinskaya depression was reviewed and directions for recovery successions occurring in different conditions of the functioning of geosystems were identified. The study of the dependence of demutation features on the state of the surrounding biocenoses allowed to isolate the pine, birch, mixed, and meadow varieties of vegetation after the termination of plowing. The dependence of the intensity of propagation of tree undergrowth on the degree of remoteness from the forests surrounding the abandoned lands was confirmed. A decrease in overgrowth of tree species was observed as the distance from the periphery of the deposit to its center increased. The main factor complicating the process of reforestation is grazing cattle. Its termination contributes to the intensive appearance of woody shoots.