The heterogeneity in physical properties of wood in spruce trees (Picea abies) containing compression wood
2008
Tarmian, A., Ph.D. Student, Faculty of Natural Resources, University of Tehran | Faezipour, M., Professor, Faculty of Natural Resources, University of Tehran | Karimi, A.N., Associate Professor, Faculty of Natural Resources, University of Tehran | Parsapajouh, D., Professor, Faculty of Natural Resources, University of Tehran
This paper was conducted to investigate the physical properties of compression wood, normal wood, and opposite wood of spruce (Picae abies).In the case of stand moisture content, there was no significant difference between the normal wood and compression wood, whereas the opposite wood was significantly different from the woods. The highest and the least stand moisture content values were observed in the compression wood (~45%) and opposite wood (~118%), respectively.The green and dry densities of the compression wood were higher than those of the other woods. There was no significant difference in the water absorption content of the normal wood (109%) and opposite wood (112.5%), whereas water absorption content of the compression wood (53.2%) was lower than that of the woods. The results also indicated that the maximum longitudinal shrinkage and swelling values of the compression wood (~3%) were higher than those of the normal and opposite woods (about 0%). In contrast, maximum radial and tangential swelling and shrinkage values of the normal wood and opposite wood were higher than those of the compression wood. Compression wood had lower maximum volumetric shrinkage and swelling compared to the other woods. Based on the findings of this study, in the same relative humidity and temperature conditions, compression wood had lower equilibrium moisture content in comparison with the normal and opposite woods. Keywords: Compression wood, Normal wood, Opposite wood, Physical properties, Spruce
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