檜皮採取によりヒノキ材の木部性質は変わるか

Translated title of the contribution: Does Bark-Decortication for <i>Hiwada</i> Production Change Mechanical Properties of Xylem in <i>Chamaecyparis obtusa</i>?

斎藤 幸恵, 山本 篤志, 太田 正光, 有馬 孝禮, 内海 泰弘, 古賀 信也, 門松 昌彦, 坂野上 なお, 山本 博一

Research output: Contribution to journalArticle

Abstract

Taking <i>Hiwada</i> bark for roof plates from Japanese cypress, (Hinoki, <i>Chamaecyparis obtusa</i>), is sustainable because the cambium zone is carefully left without damage by traditional technicians (<i>Motokawa-shi</i>). This study aimed to clarify whether bark decortication for <i>Hiwada</i> changes the mechanical properties of the wood of the decorticated tree, focusing on changes in Young's modulus and cellulose microfibril angle (MFA) in the secondary cell wall of tracheids. Several pairs of Japanese cypress trees, planted in similar environmental conditions and aged > 69 years, were carefully selected. One tree of each pair was decorticated, and the other (control) was left without any treatment. In order to remove the variability at each cell level, serial sections having the same mother cells were collected by sampling along the radial direction. The Young's modulus and MFA of the specimens were tested and the measured values were averaged for each annual ring. Then, five to nine annual rings each before and after decortication, and their changes over time were compared to the control, and the impact of decortication itself was discussed and investigated. In order to remove individual variability, we suggested the value of <i>v</i>=(<i>X</i>n-<i>X</i>n<sub>-</sub><sub>1</sub>)/Σ|(<i>X</i>n-<i>X</i>n<sub>-</sub><sub>1</sub>)|, where <i>X</i>n and <i>X</i>n<sub>-</sub><sub>1</sub> are the measured values of current and previous years, respectively. The value <i>X</i>n-<i>X</i>n<sub>-</sub><sub>1</sub> represents the level of change in the year. Individual variability was removed by dividing by Σ|(<i>X</i>n-<i>X</i>n<sub>-</sub><sub>1</sub>)|. The difference in <i>v</i> of the decorticated and untreated trees was plotted for each annual ring, but a conspicuous change was absent for both Young's modulus and MFA. These findings indicate that the xylem part was not affected by <i>Hiwada</i> decortication any more than by the usual climate impact. The <i>Hiwada</i> decortication by master technicians therefore does not affect the wood properties.
Original languageJapanese
Pages (from-to)25-32
Number of pages8
JournalMokuzai Gakkaishi/Journal of the Japan Wood Research Society
Volume61
Issue number1
DOIs
Publication statusPublished - 2015

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Elastic moduli
Mechanical properties
Wood
Cellulose
Roofs
Cells
Sampling
Direction compound

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檜皮採取によりヒノキ材の木部性質は変わるか. / 斎藤幸恵; 山本篤志; 太田正光; 有馬孝禮; 内海泰弘; 古賀信也; 門松昌彦; 坂野上なお; 山本博一.

In: Mokuzai Gakkaishi/Journal of the Japan Wood Research Society, Vol. 61, No. 1, 2015, p. 25-32.

Research output: Contribution to journalArticle

斎藤幸恵, 山本篤志, 太田正光, 有馬孝禮, 内海泰弘, 古賀信也, 門松昌彦, 坂野上 & 山本博一 2015, '檜皮採取によりヒノキ材の木部性質は変わるか', Mokuzai Gakkaishi/Journal of the Japan Wood Research Society, vol. 61, no. 1, pp. 25-32. https://doi.org/10.2488/jwrs.61.25
斎藤幸恵 ; 山本篤志 ; 太田正光 ; 有馬孝禮 ; 内海泰弘 ; 古賀信也 ; 門松昌彦 ; 坂野上なお ; 山本博一. / 檜皮採取によりヒノキ材の木部性質は変わるか. In: Mokuzai Gakkaishi/Journal of the Japan Wood Research Society. 2015 ; Vol. 61, No. 1. pp. 25-32.
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abstract = "Taking Hiwada bark for roof plates from Japanese cypress, (Hinoki, Chamaecyparis obtusa), is sustainable because the cambium zone is carefully left without damage by traditional technicians (Motokawa-shi). This study aimed to clarify whether bark decortication for Hiwada changes the mechanical properties of the wood of the decorticated tree, focusing on changes in Young's modulus and cellulose microfibril angle (MFA) in the secondary cell wall of tracheids. Several pairs of Japanese cypress trees, planted in similar environmental conditions and aged > 69 years, were carefully selected. One tree of each pair was decorticated, and the other (control) was left without any treatment. In order to remove the variability at each cell level, serial sections having the same mother cells were collected by sampling along the radial direction. The Young's modulus and MFA of the specimens were tested and the measured values were averaged for each annual ring. Then, five to nine annual rings each before and after decortication, and their changes over time were compared to the control, and the impact of decortication itself was discussed and investigated. In order to remove individual variability, we suggested the value of v=(Xn-Xn-1)/Σ|(Xn-Xn-1)|, where Xn and Xn-1 are the measured values of current and previous years, respectively. The value Xn-Xn-1 represents the level of change in the year. Individual variability was removed by dividing by Σ|(Xn-Xn-1)|. The difference in v of the decorticated and untreated trees was plotted for each annual ring, but a conspicuous change was absent for both Young's modulus and MFA. These findings indicate that the xylem part was not affected by Hiwada decortication any more than by the usual climate impact. The Hiwada decortication by master technicians therefore does not affect the wood properties.",
author = "幸恵 斎藤 and 篤志 山本 and 正光 太田 and 孝禮 有馬 and 泰弘 内海 and 信也 古賀 and 昌彦 門松 and なお 坂野上 and 博一 山本",
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T1 - 檜皮採取によりヒノキ材の木部性質は変わるか

AU - 斎藤, 幸恵

AU - 山本, 篤志

AU - 太田, 正光

AU - 有馬, 孝禮

AU - 内海, 泰弘

AU - 古賀, 信也

AU - 門松, 昌彦

AU - 坂野上, なお

AU - 山本, 博一

PY - 2015

Y1 - 2015

N2 - Taking Hiwada bark for roof plates from Japanese cypress, (Hinoki, Chamaecyparis obtusa), is sustainable because the cambium zone is carefully left without damage by traditional technicians (Motokawa-shi). This study aimed to clarify whether bark decortication for Hiwada changes the mechanical properties of the wood of the decorticated tree, focusing on changes in Young's modulus and cellulose microfibril angle (MFA) in the secondary cell wall of tracheids. Several pairs of Japanese cypress trees, planted in similar environmental conditions and aged > 69 years, were carefully selected. One tree of each pair was decorticated, and the other (control) was left without any treatment. In order to remove the variability at each cell level, serial sections having the same mother cells were collected by sampling along the radial direction. The Young's modulus and MFA of the specimens were tested and the measured values were averaged for each annual ring. Then, five to nine annual rings each before and after decortication, and their changes over time were compared to the control, and the impact of decortication itself was discussed and investigated. In order to remove individual variability, we suggested the value of v=(Xn-Xn-1)/Σ|(Xn-Xn-1)|, where Xn and Xn-1 are the measured values of current and previous years, respectively. The value Xn-Xn-1 represents the level of change in the year. Individual variability was removed by dividing by Σ|(Xn-Xn-1)|. The difference in v of the decorticated and untreated trees was plotted for each annual ring, but a conspicuous change was absent for both Young's modulus and MFA. These findings indicate that the xylem part was not affected by Hiwada decortication any more than by the usual climate impact. The Hiwada decortication by master technicians therefore does not affect the wood properties.

AB - Taking Hiwada bark for roof plates from Japanese cypress, (Hinoki, Chamaecyparis obtusa), is sustainable because the cambium zone is carefully left without damage by traditional technicians (Motokawa-shi). This study aimed to clarify whether bark decortication for Hiwada changes the mechanical properties of the wood of the decorticated tree, focusing on changes in Young's modulus and cellulose microfibril angle (MFA) in the secondary cell wall of tracheids. Several pairs of Japanese cypress trees, planted in similar environmental conditions and aged > 69 years, were carefully selected. One tree of each pair was decorticated, and the other (control) was left without any treatment. In order to remove the variability at each cell level, serial sections having the same mother cells were collected by sampling along the radial direction. The Young's modulus and MFA of the specimens were tested and the measured values were averaged for each annual ring. Then, five to nine annual rings each before and after decortication, and their changes over time were compared to the control, and the impact of decortication itself was discussed and investigated. In order to remove individual variability, we suggested the value of v=(Xn-Xn-1)/Σ|(Xn-Xn-1)|, where Xn and Xn-1 are the measured values of current and previous years, respectively. The value Xn-Xn-1 represents the level of change in the year. Individual variability was removed by dividing by Σ|(Xn-Xn-1)|. The difference in v of the decorticated and untreated trees was plotted for each annual ring, but a conspicuous change was absent for both Young's modulus and MFA. These findings indicate that the xylem part was not affected by Hiwada decortication any more than by the usual climate impact. The Hiwada decortication by master technicians therefore does not affect the wood properties.

U2 - 10.2488/jwrs.61.25

DO - 10.2488/jwrs.61.25

M3 - 記事

VL - 61

SP - 25

EP - 32

JO - Mokuzai Gakkaishi/Journal of the Japan Wood Research Society

JF - Mokuzai Gakkaishi/Journal of the Japan Wood Research Society

SN - 0021-4795

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