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영어

The anatomical, physical, and mechanical properties of wood are important indices for evaluating wood quality. I will provide some valuable information for species identification and quality indices on Korean commercial woody resources. In Castanea crenata, radial and tangential diameters of vessel elements increased with increasing tree age, but the number of vessel elements per mm2 decreased. The number of rays per mm2 increased from pith to bark, but ray height decreased with the increase of tree age. In Paulownia wood, there were significant differences in wood anatomy, physical, and mechanical properties of stem, branch, and root. The dimensional change of Paulownia wood increased after extraction in cold and hot water and Paulownia wood also showed great resistance to termites and fungi. The height and number of uniseriate and fusiform rays within a stem of Pinus koraiensis and Larix kaempferi changed with age. The microfibril angel (MFA) and relative crystallinity in earlywood and latewood of Pinus densiflora, P. koraiensis, and P. rigida decreased from pith to about 15th growth ring and then remained almost constant. The MFA and relative crystallinity of latewood was slightly smaller and higher than that of earlywood, respectively. Dahurian larch showed distinctive tracheid, ray and crystalline properties with Japanese larch. The green moisture content, density, and shrinkage of Dahurian larch wood were higher than those of Japanese larch wood. Dahurain larch showed better bending properties than Japanese larch, and both species showed a little difference in compressive properties and shearing strength. Japanese larch wood had a higher hardness than Dahurian larch wood. In both species, there were significant differences in mechanical properties between the heartwood and the sapwood. Mechanical properties of both species were significantly correlated with their physical properties, as growth ring width, latewood percentage, and density. In Dahurian larch, there were some differences in the fracture morphology between the ring shake and shear failures. The shear surface of green wood showed some similarities to the ring-shaken wood. Compression wood in Pinus densiflora and Ginkgo biloba showed distinctive anatomical characteristics to the lateral and opposite woods, while lateral and opposite woods showed mostly comparable anatomical characteristics. The properties of bamboo species will also be presented.