超音波技術應用於造林木材質檢測之探討

Evaluating the Properties Planted Trees of by Using Ultrasonic Wave Testing

詹明勳(Ming-Hsun Chan) ； 陳勁豪(Jin-Hau Chen) ； 楊德新(Te-Hsin Yang) ； 王松永(Song-Yung Wang) ； 曾郁珊(Yu-San Tseng) ； 洪崇彬(Chung-Pin Hung) ； 李金玲(Chin-Ling Lee)

《中華林學季刊》 38卷4期 (2005/12) Pp. 485-496

https://doi.org/10.30064/QJCF.200512.0009

摘要

We discussed the ultrasonic wave velocity of different seasons, sapling, thinning treatment, planting density and cutting logs to evaluate the properties of planted trees that grown in different environment and conditions. Seedling grown trees were faster than cutting or sprouting grown trees either transversal (V(subscript R)) or longitudinal (V(subscript L)) ultrasonic wave velocity of Japanese cedar and China fir, which meant the properties are much better for seedling grown trees. The ratios of V(subscript L) and V(subscript R) were 1.45-1.92. The ultrasonic wave velocity of Japanese cedar and Taiwania plantation trees among different seasons showed winter＞autumn＞summer. There was no significant difference among these seasons. However, it was significantly different between spring and other seasons of longitudinal ultrasonic wave velocity of Taiwania. The moisture content of sapwood was significantly lower than heartwood. It was not significant different among different thinning treatments of Japanese cedar. But it was significantly different among different planting density. V(subscript R) and V(subscript L) values of Taiwania both showed area Q＞S＞P or R. Compared with the standing trees and cutting logs, it was not significantly different either V(subscript R) or V(subscript L) values, which meant we could evaluate the wood properties by standing trees.

關鍵字

超音波速度 ； 疏伐 ； 栽植密度 ； 實生林 ； 插條林 ； 萌蘗林

並列摘要

We discussed the ultrasonic wave velocity of different seasons, sapling, thinning treatment, planting density and cutting logs to evaluate the properties of planted trees that grown in different environment and conditions. Seedling grown trees were faster than cutting or sprouting grown trees either transversal (V(subscript R)) or longitudinal (V(subscript L)) ultrasonic wave velocity of Japanese cedar and China fir, which meant the properties are much better for seedling grown trees. The ratios of V(subscript L) and V(subscript R) were 1.45-1.92. The ultrasonic wave velocity of Japanese cedar and Taiwania plantation trees among different seasons showed winter＞autumn＞summer. There was no significant difference among these seasons. However, it was significantly different between spring and other seasons of longitudinal ultrasonic wave velocity of Taiwania. The moisture content of sapwood was significantly lower than heartwood. It was not significant different among different thinning treatments of Japanese cedar. But it was significantly different among different planting density. V(subscript R) and V(subscript L) values of Taiwania both showed area Q＞S＞P or R. Compared with the standing trees and cutting logs, it was not significantly different either V(subscript R) or V(subscript L) values, which meant we could evaluate the wood properties by standing trees.

並列關鍵字

Cutting grown tree ； Planting density ； Seedling grown tree ； Sprouting grown tree ； Thinning ； Ultrasonic wave velocity