Annual Ring Structures of Sugi (Cryptomeria japonica) Cultivars for Considering Wood Quality Breeding

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  • 材質育種にむけてのスギ品種の年輪構造
  • 材質育種に向けてのスギ品種の年輪構造
  • ザイシツ イクシュ ニ ムケテ ノ スギ ヒンシュ ノ ネンリン コウゾウ

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Abstract

Annual ring structures and compressive properties of sugi cultivars were investigated. Three trees each from five cultivars and two trees each from four other cultivars including two triploid cultivars were felled in a 25-year-old stand and a 30-year-old stand, respectively. About 10 cm thick disk was taken from the breast height of each tree stem and was dried at room temperature. Annual ring structures of the disks were examined on nine cultivars and compression tests parallel to the grain of mature wood were done on seven cultivars. Ring structures of the pieces were also analyzed after compression tests. The results obtained may be summarized as follows: 1) There were no significant differences in tangential wall thickness and cell wall percentage of tracheid among the cultivars, but latewood percentage, basic density, tracheid length and tracheid diameter depended on cultivars. Tracheid length was longer and the diameters of tracheid and ray cell were larger in the triploid cultivars than in the diploid cultivars. 2) The cultivars having high latewood percentage showed large basic density, and high correlation between latewood percentage and basic density was obtained as a whole. 3) Specific gravity was correlated positively with compressive strength and also with work to maximum load, Latewood-tracheid length was correlated positively with Young's modulus, negatively with strain at maximum load and negatively with work to maximum load. Latewood-microfibril angle was also correlated positively with strain at maximum load and with work to maximum load, and negatively with Young's modulus. Therefore negative correlations were found between Young's modulus and strain at maximum load and between Young's modulus and work to maximum load. 4) Due to the differences in specific gravity, latewood-tracheid length and latewood-microfibril angle among the cultivars, the compressive properties depended on cultivars. The examined cultivars were roughly classified into three groups on terms of the compressive properties: Type 1 has higher Young's modulus, lower compressive strength and smaller strain at maximum load, Type 2 has lower Young's modulus, higher compressive strength and larger strain at maximum load, and Type 3 has intermediate values between Type 1 and Type 2.

Journal

  • 九州大学農学部演習林報告

    九州大学農学部演習林報告 58 109-122, 1988-03-30

    Research Institution of University Forests, Faculty of Agriculture, Kyushu University

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