TY JOUR TI PROGRESSIVE, NORMAL AND DIGRESSIONAL SECONDARY SUCCESSIONS OF FOREIGN LANDS IN THE BORDERS OF SYSTEMS OF USEFUL PROTECTIVE FOREST STRIPES OF THE REPUBLIC OF KHAKASIA KW dynamics of secondary successions KW demutation KW fallow KW squat elm KW vegetation dynamics JO Vestnik of Kazan State Agrarian University AU Martynova, M.A. PY 2020 IS 14 PB Kazan state agrarian University