TY JOUR TI STRUCTURAL FEATURES OF PROVENANCE TRAIL PLANTATIONS OF PINE IN TERMS OF DIAMETER KW Sots pine KW provenance trial plantations KW structure by diameter KW distribution of trees in steps of thickness KW variability JO Forestry Engineering Journal AU Mihaylova, M.I. AU Chernyshov, M.P. PY 2021 IS 11 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov