Acoustic and physico-mechanical properties of spruce timber: influence of differently intensive pruning

International Jubilee Scientific and Practical Conference "Innovative directions of development of the forestry complex"

生态环境科学

Antonov, O.^1^2 ; Dobrovolsky, A.^2 ; Kuznetsov, E.^2

Saint Petersburg Forestry Research Institute, 21 Institutsky prospect, Saint Petersburg

194021, Russia^1

Saint Petersburg State Forest Technical University, 5/U Institutsky pereulok, Saint Petersburg

194021, Russia^2

关键词: Acoustic constants;    Branch clusters;    Optimal values;    Physical and mechanical properties;    Physicomechanical properties;    Picea Abies (L.) Karst;    Reference values;    Stand densities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/226/1/012025/pdf
DOI  :  10.1088/1755-1315/226/1/012025

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The work studies the physico-mechanical properties of wood from the stands of Norway spruce (Picea abies (L.) Karst.), formed after pruning of various intensity. It was revealed that the high-intensity pruning in 23-year aged spruce stands (5-6 upper live branch clusters were left) led to a significant increase in the density of wood (by 15.6%) for trees with diameter larger than average in 3 years after. The removal of live and dry branches of lesser intensity does not affect the density of the wood. The wood formed as a result of 60 years of cultivation after pruning has quite high physical and mechanical properties: the compressive strength along the fibers is 51.6 1.02 MPa compared to reference value of 44.5 MPa; and the larger impact toughness (0.68 0.045 kgfm/cm2) than the reference value (0.40). It has been established that wood formed over 60-year cultivation after pruning has resonant properties: the average acoustic constant is 11.4 m4/kg sec., while the optimal value of this indicator for the use of this wood in the music industry is more than 12 m4/kg sec. It has been concluded that pruning combined with rational stand density makes it possible to produce wood with acoustic properties.