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The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.41 (1994/12) >

 
Title :広葉樹散孔材 6 樹種の要素成長と要素率(生物資源科学科)
Title alternative :The element growth and the area fraction of 6 diffuse porous woods (Department of Bioscience and Biotechnology)
Authors :林, 弘也
屋我, 嗣良
金城, 一彦
Authors alternative :Hayashi, Hiroya
Yaga, Shiryou
Kinjyou, Kazuhiko
Issue Date :1-Dec-1994
Abstract :木本植物二次成長量の測定には破壊的な方法が採られるが, 同一の部位で測定できない欠点がある。成長量の無破壊的な測定法の確立が期待されている。広葉樹散孔材の樹種について, 成長量を成長の終った材部から得たデータによって推定する方法を検討する目的で, 構成細胞の面積率, 直径について基礎的な検討をした。最初に道管の直径は早材, 晩材など成長速度によって変化する。道管の直径と面積率との関係を検討し, 直径が変化しても面積率が一定である樹種, 直径が一定で面積率が変化する樹種, 直径と面積率とは比例関係にあり, 両者の中間の樹種を確認した。また面積率は要素の相対的な成長量を示す指標になると考え, 面積率を検討した。放射柔細胞の面積率は一定しており, 成長速度との関係はなかった。木部の主要な構成要素である道管と木部細胞の面積率には, 負の相関が認められた。道管の面積率変化量の大部分は木部繊維の成長量の変化で補われていることが結論された。
The secondary growth of the woody plant depends on the cell division and the cell enlargement in cambial zone. The understanding of cell growth rate is an important problem to analyze the grown-up process of the woody plant. There is a destructive way of the marking method in the cell growth. measuring However, the measuring skill is difficult for this method and measurement takes long. This method is disadvantagous in technique and in time to apply to the analysis study of the grown-up process of plants for the above reasons. It is desirable to measure the grown-up rate in the non-destructive method of a growing plant. This report had a purpose of getting knowledge about the basic factor to examine an non-destructive method. It examined the changes of the diameter of a vessel and area fraction of vessels of woody plant. It is considered theoretically that the area fraction is the index which shows relative growth among elements. It is described the experimental results. The area fraction of the ray parenchyma cells is constant and is unrelated to the grown-up rate. The area fraction of the vessel changed with the vessel diameter but the relation of both depends on the tree species. Investigated tree species was classified into three groups based on the relation of both factors. Prior group-Kusunoki (Cinnamomum camphora)-had constsnt area fraction irrespective of the vessel diameter and the grown-up rate was constant. 2nd group-Isunoki (Distylium racemosum), Hounoki (Magnolia obovata)-had constant vessel diameter but the area fraction changed. Grown-up rate is ruled by the dividing times of cell in the cambial zone. 3rd group-Yabunikkei (Cinnamomum japonica), Shibanikkei (Cinnamomum doede rleinii), Katsura (Cercidiphyllum japonicum)-had in the proportional relation between the vessel diameter and the area fraction. The grownup rate is ruled by both with the divideing times and enlargement of the cells in the cambial zone. The vessel and the wood fiber are the main element of the broadleaf wood. The area fraction of both elements was in the inverse proportion relation and the summation with the area fraction of both elements was nearly constant in the range of the examined tree species.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3780
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.41 p.313 -318
Appears in Collections:No.41 (1994/12)

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