TY CONF TI UNDERGROWTH AS AN IMPORTANT COMPONENT OF CARBON BALANCE IN SPRUCE PHYTOCENOSES KW North-west of Russia KW forest ecosystem KW spruce forest KW undergrowth KW phytomass KW carbon reserves JO FORESTRY, FOREST MANAGEMENT, STATE FOREST MANAGEMENT IN THE 21ST CENTURY: CHALLENGES AND SOLUTIONS AU Muntyanu, M.I. AU Voldaev, L.K. AU An', M.H. 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