| Project/Area Number |
18K05768
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 40020:Wood science-related
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
Adachi Koji 秋田県立大学, 木材高度加工研究所, 准教授 (70451838)
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| Co-Investigator(Kenkyū-buntansha) |
工藤 佳世 秋田県立大学, 木材高度加工研究所, 助教 (10757983)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 曲げ木 / 秋田スギ / 天然スギ / 比弾性率 / 過熟材 / スギ / 形状比 / 過熟 / 応力波伝播法 / 応力波伝播速度 / 曲げわっぱ / 組織構造 / ミクロフィブリル傾角 |
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| Outline of Final Research Achievements |
Planted sugi trees (Cryptomeria japonica) with a small DBH (Diameter at Breast Height) - H (Height) ratio tended to have a low specific MOE (modulus of elasticity in bending) and a large amount of bending deflection. This trend was consistent with the material properties of natural sugi, which shows late growth pattern. There was no clear relation between the annual ring width and specific MOE in mature wood. As a result of measuring the material variation of the specific MOE of planted sugi and natural sugi in the radial direction, the increase rate of the specific MOE at the time of transition from juvenile wood to mature wood was about 1.6 times for planted sugi, while about 1.2 times for natural sugi. It was suggested that the growth behavior during the juvenile wood period has a great influence on the material of the mature wood.
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| Academic Significance and Societal Importance of the Research Achievements |
天然スギは人工林スギよりも曲げ木に適しているが、天然と人工の意味する材質指標や生育特性が不明で、人工林主体の今後の森林経営において、曲げ木用の高齢級スギ材の育林方針の設定が困難な状況であった。本研究において、天然スギは未成熟期から成熟期での比弾性率の増加幅が抑制される成長状態であること、現状の人工林でも形状比の小さい林分は曲げやすい立木が多いことが明らかとなり、植栽時にはスギ苗の初期成長の制御、成林の人工林に対しては樹形による選別の有用性を導き出すことが出来た。
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