Longitudinal Change of Dynamic Modulus of Elasticity and Quality Evaluation by a Non-destructive Method in Todomatsu (Abies sachalinensis) Plus Trees

Abstract

Longitudinal changes of dynamic modulus of elasticity values (Efr) of logs for todomatsu (Abies sachalinensis) were investigated to clarify the best vertical region of the stem (height from ground level) to estimate its mean Efr value, using plus trees and breeding stock. The relationship between stress wave velocity (Vp) of standing trees and Ex of logs was also investigated to test the suitability of the stress wave propagation method for todomatsu. The longitudinal changes of Efr of logs show similar tendencies within individuals for each clone. Efr of the region from ground level to a height of 3 m could be used as an alternate value to the mean Efr, and the region including breast height was appropriate for its genetic comparison between clones. Significant correlation between Efr of logs and Vp of standing trees was obtained both in individuals and in clones. The correlation coefficients were especially high. Therefore it would be possible to estimate Efr of logs in todomatsu based on the measurem nt of Vp of standing trees at breast height. This method will allow us to evaluate the wood quality of clones non-destructively. © 2006, The Japan Wood Research Society. All rights reserved.