TY JOUR TI SPATIAL VARIATION OF ECOLOGICAL INDICATORS OF SODDY-FORESTSOILS IN USMANSKY PINE FOREST KW soil cover KW spatial variation KW ecological state KW soddy forest soils KW Usmansky pine forest KW geographic information systems KW physicochemical and chemical properties JO Forestry Engineering Journal AU Belik, A.V. AU Gorbunova, Y.S. AU Devyatova, T.A. AU Alaeva, L.A. PY 2025 IS 10 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov