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  [in Japanese] Diagnosis of wood decay using stree-wave velocity measurement at the oldest Larix kaempferi plantation in Japan  [in Japanese]

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Author(s)

Abstract

浅間山国有林の160年生と115年生のカラマツ高齢人工林において,立木地際部の腐朽診断を応力波測定法によって非破壊で行った.応力波伝播速度のヒストグラムは,両林分とも1.8 km・s^<-1>の階級にモードを持ち,根株心材腐朽の進行した林分に特徴的なJ字型の分布型を示した.先の報告をもとに,応力波伝播速度が1.4 km・s^<-1>より遅い階級では全ての個体が腐朽していると仮定すると,林分全体の160年生林では25%,115年生林では24%の個体が腐朽していると推定された.160 年生林においては,樹幹の枝基部等にマツノカタワタケの子実体が見られ,この林分では根株の心材腐朽に加えて,樹幹の心材腐朽も進行していると考えられた.マツノカタワタケによる樹幹腐朽を加えると,160年生林では林分全体の少なくとも36%の個体が腐朽していると推定された.

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 buttheartrot 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.

Journal

  • Tree and forest health

    Tree and forest health 14(3), 92-96, 2010-07-31

    樹木医学会

References:  21

Codes

  • NII Article ID (NAID)
    110009646244
  • NII NACSIS-CAT ID (NCID)
    AA11493506
  • Text Lang
    JPN
  • Article Type
    SHO
  • ISSN
    13440268
  • NDL Article ID
    10839054
  • NDL Source Classification
    ZR3(科学技術--生物学--植物)
  • NDL Call No.
    Z74-B105
  • Data Source
    CJP  NDL  NII-ELS  IR 
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