TY JOUR TI Using FTIR spectroscopy to detail wood chemistry of Ussuri bark beetle (Polygraphus proximus Blandford) - invaded Siberian fir (Abies sibirica Ledeb.) trees KW Siberian fir KW FTIR spectroscopy KW Ussuri polygraph KW climate trend JO Forestry Engineering Journal AU Artemihina, E.A. AU Zhila, S.V. AU Danilyuk, Y.V. AU Eliseev, S.G. AU Bayandin, M.. PY 2026 IS 16 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov