TY CONF TI THE INFLUENCE OF THE DISTANCE BETWEEN A TREE AND THE UNDERGROWTH ON THE INTENSITY OF COMPETITIVE RELATIONS KW Leningrad region KW sour spruce forest KW stand KW undergrowth KW competition JO FORESTRY, FOREST MANAGEMENT, STATE FOREST MANAGEMENT IN THE 21ST CENTURY: CHALLENGES AND SOLUTIONS AU Kazi, I.A. AU Beliaeva, N.V. AU Gryaz'kin, A.V. PY 2024 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov