カラマツ人工林内における広葉樹の更新過程  [in Japanese] Regeneration Process of Broadleaved Trees in Planted Larix kaempferi Forests  [in Japanese]

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Author(s)

    • 花田 尚子 HANADA N.
    • 北海道大学大学院農学研究科森林政策学分野 Laboratory of Forest Policy, Graduate School of Agriculture, Hokkaido University
    • 渋谷 正人 SHIBUYA M.
    • 北海道大学大学院農学研究科造林学分野 Laboratory of Silviculture, Graduate School of Agriculture, Hokkaido University
    • 斎藤 秀之 [他] SAITO H.
    • 北海道大学大学院農学研究科造林学分野 Laboratory of Silviculture, Graduate School of Agriculture, Hokkaido University
    • 高橋 邦秀 TAKAHASHI K.
    • 北海道大学大学院農学研究科造林学分野 Laboratory of Silviculture, Graduate School of Agriculture, Hokkaido University

Abstract

北海道石狩低地帯南部の41~51年生のカラマツ人工林において, 林内への広葉樹の侵入過程を明らかにするため, 施業履歴, 林分構造, 広葉樹の樹種構成, 樹齢, 埋土種子の種組成を調べた。広葉樹の密度は, 林床にササが優占する林分で小さく, ササ類は広葉樹の更新に負の影響を与えていると考えられた。広葉樹の更新個体数は, 間伐後に増加する傾向が顕著であり, 間伐は広葉樹の更新契機になっていると考えられた。また広葉樹の樹種数は, 間伐にともなって階段的に増加しており, 特にギャップ種は, 初回の間伐以降に樹種数が増加していた。埋土種子の種構成は, 広葉樹の樹種構成とは類似しておらず, カラマツ人工林内での広葉樹類の更新には, 種子バンクの寄与は小さいと推察されたが, 埋土種子についてはさらなる検討が必要と考えられた。結論として, カラマツ人工林内での広葉樹の更新には, ササが負の影響を与えていること, 間伐は広葉樹の個体数を増加させるだけではなく, 林内の種多様性も高める効果があること, さらに広葉樹の更新時期や樹種構成には更新特性が強く影響することが示唆された。

To examine the regeneration process of broadleaved trees in planted larch (<i>Larix kaempferi</i>) forests, we investigated stand structures, species compositions and age distributions of broadleaved trees related to thinning histories, and species compositions of buried viable seeds in six planted larch forests located in the southern part of the Ishikari lowlands in Hokkaido, northern Japan. Density of broadleaved trees was lower in planted larch forests with dense sasa (<i>Sasa</i> spp.), and it was assumed that sasa inhibited the regeneration of broadleaved trees in planted larch forests. It was also assumed that thinning positively influenced the regeneration of broadleaved trees in the plantations, because the density of the trees increased after thinning. The number of species of broadleaved trees increased stepwise with thinning, and especially, the number of gap-dependent species markedly increased after the first thinning in the planted larch forests. Species composition of buried viable seeds was not similar to species composition of broadleaved trees. It was guessed that the seeds contributed little to the regeneration of broadleaved trees in planted larch forests, and yet more detailed examination of buried viable seeds in will be needed. Consequently, it was concluded that sasa negatively influenced the regeneration of broadleaved trees, and that thinning increased both density and species diversity of the trees in planted larch forests. Furthermore, it was suggested that the timing of the regeneration and species composition of broadleaved trees in planted larch forests are closely related to regeneration habits of the trees.

Journal

  • Journal of the Japanese Forest Society

    Journal of the Japanese Forest Society 88(1), 1-7, 2006-02-01

    Japanese Forestry Society

References:  31

Cited by:  7

Codes

  • NII Article ID (NAID)
    110006278819
  • NII NACSIS-CAT ID (NCID)
    AA12003078
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13498509
  • NDL Article ID
    7838055
  • NDL Source Classification
    ZR21(科学技術--農林水産--林産)
  • NDL Call No.
    Z18-340
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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