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No.43 (1996/12) >

 
Title :ニュージランドパイン (Pinus radiata) 仮道管壁の横断面における乾縮(生物資源科学科)
Title alternative :Tracheid wall shrinkage in cross section of New Zealand pine (Pinus radiata) (Department of Bioscience and Biotechnology)
Authors :林, 弘也
龍, 游江
屋我, 嗣良
金城, 一彦
Authors alternative :Hayashi, Hiroya
Long, Youjiang
Yaga, Shiryou
Kinjyou, Kazuhiko
Issue Date :1-Dec-1996
Abstract :木材の乾縮率の決定に関与する因子は壁のフィブリル傾角,木化度,早晩材の構成比,細胞形などが提案されているが,因子の関与度合はあまり明らかにされていない。本報告は早成樹ニュージランドパイン(Pinus radiata)を対象に細胞壁の乾縮と細胞の乾縮の関係を検討した。マツ材は残留応力や水溶性の抽出成分を除去し,切片上で乾縮を計測した。乾燥は切片に新たな応力や変形を生じないようにアルコールで脱水した。仮道管の脱水により,細胞壁は乾縮するが,細胞内腔は膨張した。膨張量は乾縮量よりも大きいために仮道管は膨張した。また放射壁と切線壁の乾縮量の比は仮道管群の寸法変化率や木材ブロックの乾縮率の比と異なっていた。これらのことから木材の乾縮は隣接する仮道管の寸法変化の相互作用や細胞の配置状態による影響があると推察された。
It was suggested by Boyd (1974) that the mechanisms affecting a shrinkage of wood were fibril angle, degree of lignification, a ratio of early wood to late wood in one growth ring and a cell shape. But it was not clear the effecting degree of factors. In this article, it was discussed the relation between tracheid shrinkage and cell wall shrinkage caused by a moisture content in the cross section of a fast grown tree, New Zealand pine (Pinus radiata). Specimen were treated with warm water at 40℃ for removing residual stress like growing stress and extractives. A shrinkage was measured with a thin specimen, and was dehydrated step by step with ethyl alchol solution to avoid abnormal shrinkage. By dehydration, a tracheid cell wall shrank but a lumen of the tracheid swelled. As a quantity of the swelling was greater than the shrinkage, tracheids swelled consequently. The shrinkage ratio of radial wall to tangential wall was differ from the average wood shrinkage ratio of eleven pinus species in US. The dimension change coefficient of one tracheid was greater than the coefficient of tracheid group contained many tracheids. It was concluded from the results obtained that a dimensional change of wood was affected by the interaction of a dimensional change of adjacent tracheids and by the geometrical arrangement.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3735
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.43 p.113 -118
Appears in Collections:No.43 (1996/12)

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