Effects of growth ring parameters on mechanical properties of Japanese larch (Larix kaempferi) from various provenances

概要

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Growth ring parameters obtained by X-ray densitometry, modulus of elasticity, bending strength, compressive strength, and shear strength of 138 Japanese larch trees belonging to 23 provenances were studied to examine the effects of growth ring parameters on mechanical properties. The considered growth ring parameters were ring width, average wood density within a ring, earlywood density, latewood density, and latewood percentage. The strength properties of the small clear specimens, particularly in the outerwood, were strongly affected by wood density. Among the growth ring parameters studied, earlywood density had a major effect on average wood density in the corewood, whereas the effect of latewood percentage on average wood density was greatest in the outerwood. Compared with the other growth ring parameters, average wood density was more stable from the juvenile to mature stage, and is considered to be a reliable index of wood quality in early selection.
Hokkaido University Forestsの論文