Wood Quality Variations of Native Cultivars and the Clones of Plus Trees in the Experimental Areas of Cultivars of Cryptomeria Japonica in Kyushu

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Other Title
  • 六演習林スギ品種試験地のスギ在来品種および精英樹クローン間の材質変動
  • 6演習林スギ品種試験地のスギ在来品種および精英樹クローン間の材質変動
  • 6 エンシュウリン スギ ヒンシュ シケンチ ノ スギ ザイライ ヒンシュ オ

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Abstract

In order to investigate the wood quality variation of Cryptomeria japonica, bulk density, late wood ratio, and the distribution pattern of bulk density within annual ring were determined using the soft X-ray and densitometric method for 6 native cultivars and 25 clones of plus trees selected in Kyushu, The test trees were obtained from the experimental areas of C. japonica cultivars, which had been established 6 different location in Kyushu in a same experimental design and had been treated homogeneously. Although the ages of trees were young (12 or 13 years after plantation), it is considered to be able to compare the clonal difference using those several outer annual rings at breast height which showed rather stable variation of wood density and the mean was representative of the whole trunk. Cultivars Ayasugi and Yabukuguri showed the greatest bulk density and latewood ratio among the native cultivars, while Obiaka showed the smallest. The values of the both characteristics were decreased accompanied with an increase of ring width. Although the clonal difference of the characteristics seemingly resulted form the clonal difference of the annual ring growth, it was clarified that even after an exclusion of the dependence on annual ring width using the covariance analysis, the corrected mean of bulk density and latewood ratio were still significantly different among some cultivars. The distribution pattern of bulk density within an annual ring was specific to the cultivar, that is, Obiaka and Ayasugi increased the bulk density in the beginning of the early wood formation, whereas Obiaka maintained the lower density as same as the minimum density within early wood and increased drastically to latewood. To compare the pattern obtained from all annual density among cultivars, a simple model was suggested to express the curve of the pattern and the coefficiant b of power function could indicate the pattern difference. The b values were significantly different among some cultivars, Almost same results were obtained for the 25 clones of plus trees. 15 out of 25 clones were reportedly identified as equivalent to each of 7 native cultivars, and their tendencies of bulk density and latewood ratio were similar to the identified cultivars, It is suggested that the tree breeding for faster radial growth and higher wood density at the same time might be possible for C. japonica.

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 57 149-173, 1987-03-30

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

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