TY CONF TI RESEARCH DIRECTIONS AND MAIN FINDINGS ON ASPEN STANDS IN THE VORONEZH REGION AND THE CENTRAL FOREST-STEPPE KW aspen (Populus tremula L.) KW Voronezh region KW breeding and clonal trials KW stand productivity KW photosynthesis JO CONTEMPORARY CHALLENGES AND TOPICAL ISSUES OF BIODIVERSITY AND SUSTAINABILITY OF PLANT COMMUNITIES AU Efimenko, D.A. AU Popova, A.A. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov