センダン,シバニッケイ材の成長輪構造(生物資源科学科)

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タイトル別名
  • Growth ring constitution of SENDAN-and SHIBANIKKEI-wood (Department of Bioscience and Biotechnology)
  • センダン,シバニッケイ材の成長輪構造
  • センダン シバニッケイザイ ノ セイチョウ リンコウゾウ

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抄録

木材の組織因子と材質との関係を解析するために,成長輪を材解析の一つの単位として考え,成長輪内の構成要素について各要素の形態や分布状態など成長輪の構造を検討した。環孔材のセンダン材と散孔材のシバニッケイ材の道管,木部軸方向柔細胞について成長輪内の直径,細胞壁厚の分布状態を明らかにし,次ような結果を得た。1,道管の放射直径は接線直径より大きいが,センダン材は接線直径50μm以下の道管では,この傾向は認められなかった。2,細胞分裂後の細胞の拡大割合が大きい場合に,同じ材部にある他の要素の拡大割合が小さくなる。3,センダン材の要素の寸法変動はシバニッケイ材に比較して大きい。4,道管の直径は早材が最も大きいが,他の要素は,センダン材では成長輪の0.3∿0.5の位置に最大値があり,シバニッケイ材も0.3∿0.5の位置に最大値がある。この位置以降の材部では,センダン材は要素の直径を減少するが,シバニッケイ材は最大値と同じ直径であった。

A growth ring structure of soft woods was investigated in anatomical analysis such as late wood ratio, tracheid length and tracheid wall thickness, and in qualitative analysis such as specific gravity and fibril angle. And the results obtained from both analysis related to wood quality. On hard woods, it was only investigated geometical arrangement of elements by microscopical observation and average element dimension such as diameter of elements, vessel element and wood fiber length, cell wall thickness. A growth ring was the most smallest unit to investigate the relation between a anatomical factor and a wood quality. But it was not proved sufficiently the growth ring struture of hard woods on element distribution. A ring porous wood-SENDAN-wood (Melia azedarach)-and a diffuse porous wood-SHIBANIKKEI-wood (Cinnamomum doederleinit)-was inverstigated the dimensional distribution of elements in a growth ring in this report. The results obtained from this envestigation were as follows : 1. A vessel diameter was more larger in radial direction than tangential direction. But in SENDAN-wood, vessels which were smaller diameter than 50μm in tangential diameter, had not the above tendency. 2. When a cell had large enlargement ratio like a vessel, enlargement ratio of srounding cells were smaller ratio than the same kind of cells. 3. Dimentional chang of SENDAN-wood was larger than SHIBANIKKI-wood in a growth ring. 4. A maximum diameter of a vessel was formed at the early stage of a growth ring. Maximum diameter of other elements were formed at the position of 0.3-0.5 of a growth ring from the ealry wood ring border. In SENDAN-wood, the diameter of elements was decrease both early wood side and late wood side. But in SHIBANIKKEI-wood, the diameter of elements was decleased in early wood side and held constant at maximum diameter in late wood side.

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