Diagnosis of wood decay using stress-wave velocity measurement at the oldest <i>Larix kaempferi</i> plantation in Japan

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  • Kobayashi Hajime
    Education and Research Center of Alpine Field Science, Shinshu University
  • Okada Mitsuhiro
    Nagano Prefecture Forestry Research Center
  • Ono Hiroshi
    Department of Forest Science, Faculty of Agriculture, Shinshu University
  • Yasue Koh
    Department of Forest Science, Faculty of Agriculture, Shinshu University
  • Inoue Hiroshi
    Department of Forest Science, Faculty of Agriculture, Shinshu University
  • Ueki Tatsuhito
    Department of Forest Science, Faculty of Agriculture, Shinshu University

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Other Title
  • 日本最古のカラマツ人工林における応力波伝播速度測定による生立木の腐朽診断
  • ニホン サイコ ノ カラマツ ジンコウリン ニ オケル オウリョクハ デンパ ソクド ソクテイ ニ ヨル ナマタチキ ノ フキュウ シンダン

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Stress-wave velocity at the base of trunk in the transverse direction was investigated in 160-year-old and 115-year-old Larix kaempferi stands in the Asamayama National Forest. The mode of frequency distribution of stress-wave velocity classes of both 160-year-old and 115-year-old stands was 1.8 km s-1. Both stands exhibited a J-shaped frequency distribution which is typical of stands including butt-heart-rot trees. Assuming that stress-wave velocity classes below 1.4 km s-1 indicated total decay based on previous reports, we estimated that 24 percent of the total individuals were decayed in 115-year-old stand and 25 percent in 160-year-old stand. Fruitbodies of Cryptoderma pini were observed on the base of dead branches of 160-year-old Larix kaempferi trees. We surmised that stem-heart-rot is occurring in addition to butt rot in the 160-year-old stand. When stem rot is included, thirty-six percent of total individuals would be considered decayed in the 160-year-old stand.

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