TY JOUR TI DEMOUTIONAL AND INVASIVE PROCESSES OF LAYLANDS IN THE STEPPE ZONE OF THE REPUBLIC OF KHAKASSIA KW Ulmus pumila KW demutation KW invasion KW windbreak forest fields KW natural regeneration KW laylands JO Bulletin of KSAU AU Martynova, M.A. PY 2019 IS PB Krasnoyarsk State Agrarian University