八ヶ岳の山梨県有林に設置したヤツガタケトウヒ試験区におけるシカ被害を受けた林相の12年間の変化  [in Japanese] Changes in the state of the forest between 12 years damaged by <i>Cervus nippon</i> at an experiment plot for <i>Picea koyamae</i> established in the Yamanashi prefectural forest.  [in Japanese]

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Abstract

八ヶ岳連峰東斜面の山梨県北杜市の県有林において、絶滅危惧種ヤツガタケトウヒの保全のため、1ha の試験地を設置し、2005年と2017年に調査をおこなった。この期間中、生存幹本数が2,755本から 1,248本に減少、胸高断面積合計(BA) が 30.0m<sup>2</sup> から 31.4m<sup>2</sup> に微増、出現樹種の分類群が37から29に減少した。ニホンジカの被害によって、幹本数と出現樹種数が減少したと考えられた。ヤツガタケトウヒは、2005年に樹皮ガードを取り付けたことで、母樹サイズの胸高直径20cm 以上は42本から36本の減少にとどまった。しかし、若木サイズの胸高直径20cm 未満が8本から2本に低下し、後継樹が見られないことから、自生地保全のために苗木の増殖が必要と考えられた。

An experiment plot (1 ha) was established in the Yamanashi prefectural forest of Hokuto City on the east slope of Mts. Yatsugatake to preserve the endangered species <i>Picea koyamae</i>. Comparative observations of trees in the plot were carried out in 2005 and 2017. During this period, the alive stem number greatly decreased from 2,755 to 1,248, the basal area at breast height (BA) increased from 30.0 m<sup>2</sup> to 31.4 m<sup>2</sup>, and the number of confirmed taxa decreased from 37 to 29. We guessed that the decreases in number of stems and number of c onfirmed taxa were due to damage by <i>Cervus nippon</i>. The number of mother trees of <i>P. koyamae</i> larger than 20 cm in diameter at breast height (DBH) slightly decreased from 42 to 36 due to the positive influence of bark guards attached in 2005. However, it of younger trees smaller than 20 cm in DBH decreased significantly from eight to two. We propose that propagation of seedlings is necessary due to the lack of successful saplings for its <i>in situ</i> conservation.

Journal

  • Bulletin of the Forestry and Forest Products Research Institute

    Bulletin of the Forestry and Forest Products Research Institute 18(1), 101-109, 2019

    Forestry and Forest Products Research Institute

Codes

  • NII Article ID (NAID)
    130007644037
  • NII NACSIS-CAT ID (NCID)
    AN10164318
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    0916-4405
  • NDL Article ID
    029643431
  • NDL Call No.
    Z18-455
  • Data Source
    NDL  J-STAGE  JASI 
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