Acoustic Properties of Norway Spruce Wood Modified with Staining Fungus (Sydowia polyspora)

Anna Danihelová, Dominik Spišiak, Ladislav Reinprecht, Tomáš Gergeľ, Zuzana Vidholdová, Vojtěch Ondrejka


Effects of biological modification of Norway spruce wood with the wood-staining fungus Sydowia polyspora were evaluated relative to select physical and acoustical characteristics (PACHs), including the density (ρ), dynamic modulus of elasticity along the wood grain (EL), specific modulus (Esp), speed of sound along the wood grain (cL), resonant frequency (fr), acoustic constant (A), logarithmic decrement (ϑ), loss coefficient (η), acoustic conversion efficiency (ACE), sound quality factor (Q), and sound timbre. Incubation of the Norway spruce samples in S. polyspora lasted 12 w, 20 w, and 24 w. The results showed that the incubation time of spruce wood in S. polyspora did not have a statistically significant impact on most of the PACHs (ρ, EL, cL, fr, and A). However, biological modification of the spruce wood with S. polyspora had significant effects on the ϑ, η, and ACE. Treatment of the spruce wood with S. polyspora also changed the sound timbre, but the effects varied for each frequency.


Norway spruce wood; Biological modification; Sydowia polyspora; Physical and acoustical characteristics; Timbre of sound

Full Text:


Welcome to BioResources! This online, peer-reviewed journal is devoted to the science and engineering of biomaterials and chemicals from lignocellulosic sources for new end uses and new capabilities. The editors of BioResources would be very happy to assist you during the process of submitting or reviewing articles. Please note that logging in is required in order to submit or review articles. Martin A. Hubbe, (919) 513-3022,; Lucian A. Lucia, (919) 515-7707, URLs:; ISSN: 1930-2126