TY CONF TI HALF-CENTURY MONITORING OF THE CONDITION OF AUTOCHTHONIC POPLAR TREE STANDS IN THE KHOPERSKY RESERVE KW white poplar; sedge; graying poplar; variety; breeding selection JO FORESTRY-BIOLOGICAL FOUNDATIONS OF SUSTAINABILITY OF NATURAL AND ARTIFICIAL PHYTOCOENOSES AU Sivolapov, A.I. AU Blagodarova, T.A. AU Sivolapov, V.A. PY 2024 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov