TY CONF TI SEASONAL PHOTOSYNTHETIC PRODUCTIVITY IN TREE SPECIES OF THE GENUS BETULA, POPULUS, AND PINUS IN THE FOREST-STEPPE ZONE OF THE EUROPEAN PART OF RUSSIA KW photosynthetic productivity KW birch KW poplar KW scots pine KW vegetation period JO TECHNOLOGIES IN BIOECONOMICS: INNOVATIONS AND CHALLENGES IN THE 21ST CENTURY AU Evlakov, P.M. AU Ryzhkova, V.S. AU Zhuzhukin, K.V. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov