TY CONF TI STUPINSKOYE FIELD NATURE MONUMENT: CURRENT PRESERVATION OF 60-YEAR-OLD SCOTS PINE TREES IN DIFFERENT ECOTYPES OF GEOGRAPHICAL FOREST CROPS KW Scots pine KW geographical forest crops KW forest-steppe and steppe ecotypes KW current conservation JO FORESTRY-BIOLOGICAL FOUNDATIONS OF SUSTAINABILITY OF NATURAL AND ARTIFICIAL PHYTOCOENOSES AU Mihaylova, M.I. AU Chernyshov, M.P. PY 2024 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov