Use of trunk-MOE of Japanese cedar as forestry management information

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  • TERAOKA Yukio
    Department of Environmental Sciences and Technology, Faculty of Agriculture, Kagoshima University
  • TAKATA Katsuhiko
    Subject of Forest Bioscience, Department of Forest and Forest Products Science, Faculty of Agriculture, Graduate Schools of Kyushu University
  • KOGA Shinya
    Subject of Forest Ecosphere Sciences and Management, Department of Forest and Forest Products Science, Faculty of Agriculture, Graduate Schools of Kyushu University

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Other Title
  • 林業経営情報としてのスギ樹幹ヤング係数の利用
  • リンギョウ ケイエイ ジョウホウ ト シテ ノ スギ ジュカン ヤング ケイスウ ノ リヨウ

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The purpose of this study was to measure the trunk-MOE (modulus of elasticity of a tree trunk) of Cryptomeia in the forest stand and to examine its use as forestry management information. First we analyzed the relationships between the trunk-MOE measured by the tree-bending test and the tree growth factors (tree height and DBH) in the Obi-sugi (Cryptomeria japonica) young plantation stand. Then, we proposed a DBH-based thinning method to control trunk-MOE in the stand, and discussed the possible application of trunk-MOE as forest management information. There was a weak negative correlation between the DBH and the trunk-MOE in 19- and 23-year-old stands, which showed the formation of mature wood during this period and the reproductivity of the measurement. The DBH-based thinning was suggested to result in the change of the average trunk-MOE in a stand and little affect coefficient of variation of trunk-MOE. The results indicate that it might be possible to produce timber satisfying user-side demands by using the stand trunk-MOE as management information.

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