頁籤選單縮合
題名 | 不同齡級對臺灣杉造林木材質之影響=Effects of Age on Strength Properties of Taiwania Plantation Wood |
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作者姓名(中文) | 周群; | 書刊名 | 臺灣林業科學 |
卷期 | 13:2 1998.06[民87.06] |
頁次 | 頁119-125 |
分類號 | 436.181 |
關鍵詞 | 臺灣杉; 樹齡; 樹高; 髓心距; 強度; Taiwania; Age; Tree height; Distance from pith; Strength; |
語文 | 中文(Chinese) |
中文摘要 | 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 。 |
英文摘要 | 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 showed 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. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。