TY JOUR TI Analysis of regional growth curves of Picea obovata Ledeb. in the Southern Urals KW Southern Urals KW regional growth curves KW radial increment KW Siberian spruce JO Forestry Engineering Journal AU Lozhkin, G.I. AU Grigor'ev, A.A. AU V'yuhin, S.O. AU Chizhikova, N.A. PY 2026 IS 16 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov