不同齡級對台灣杉造林木材質之影響

Effects of Age on Strength Properties of Taiwania Plantation Wood

周群(Chun Chou)

《台灣林業科學》 13卷2期 (1998/06) Pp. 119-125

https://doi.org/10.7075/TJFS.199806.0119

摘要

本研究針對四個齡級之台灣杉造林木，探討樹齡、樹高、及不同髓心距對其強度及性質之影響。在木材基本性質方面，結果顯示台灣杉之平均年輪寬大致隨樹齡增加而減少，但受樹高之影響不大；心材率隨樹高增加而呈直線下降。在強度方面，均隨樹齡增加而增強，但15年生與21年生差異不顯著，且彈性係數增加之幅度大於靜曲及縱向壓縮強度；除靜曲強度各齡級間受樹高之影響不規則外，其餘強度性質均隨樹高增加呈先增後減趨勢；髓心距對各強度之影響則不一致，離髓心愈遠之彈性係數愈佳，靜曲強度則無一定規則，縱向壓縮強度則呈與彈性係數相反之趨勢。

關鍵字

台灣杉 ； 樹齡 ； 樹高 ； 髓心距 ； 強度

並列摘要

Taiwania plantation woods of 4 age groups were studied to investigate the effects of age, tree height and distance from pith on their strength properties. Results show that annual ring width decreased with increasing age; however, it was not affected by tree height. Heart wood ratio decreased with increasing tree height. Strength properties increased with increasing age. No significant strength difference was detected between 15-and 21-yr-old Taiwania wood. Strengths increased then decreased with increasing tree height except for bending strength. Moduli of elasticity increased with distance from pith; longitudinal compression strength, however, exhibited the opposite tendency.

並列關鍵字

Taiwania ； age ； tree height ； distance from pith ； strength