長野県北東部におけるブナ林の構造と更新に関する平坦面と斜面間の差異 Differences in forest structure and regeneration of beech (Fagus crenatd) forest between flat surface and slope surface in N.E. Nagano Prefecture, Japan.

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著者

    • 蛭間 啓 Hiruma Akira
    • 東京農工大学連合農学研究科 The United Graduate School of Agricultual Science, Tokyo University of Agriculture and Technology

抄録

  1.長野県北東部,雑魚川流域のブナ林において平坦面,斜面それぞれの林分に80m×80mのコドラートを設置し,林分構造を調べ,更新様式を比較した. <BR>  2.林分構造は,亜高木層,草本層の平均植被率が平坦面よりも斜面で高く,第二低木層平均植被率,ササの平均被度は平坦面で高かった.木本種の全基底面積は平坦面で大きかったが,個体数は斜面で多かった. <BR>  3.平坦面のブナの小径木と中径木の間には共存関係がみられ,大径木と小径木及び中径木との間には非共存関係がみられた.斜面ではブナのDBHサイズクラス間での明瞭な共存,非共存関係はみられなかった.平坦面では複数の異なる発達段階からなるモザイク状の再生パターンが明瞭にみられ,斜面ではモザイク状の再生パターンは不明瞭であった. <BR>  4.平坦面ではブナの稚樹,幼樹の本数が少なく,斜面で多かった. <BR>  5.斜面では倒木の本数が多くそのサイズが平坦面よりも小さかったことから,斜面では立地が不安定なためギャップが頻繁に形成されやすいと考えられた. <BR>  6.平坦面では,林床にササが繁茂しているため後継樹が育ちにくく,ササの一斉枯死のような数少ない機会にギャップにおいて更新が行われており,更新が不連続である.斜面ではササの被度が低く,閉鎖林冠下でも後継樹の育ちが良く,頻繁に起こる倒木の直後に林冠をうめることができ,更新が連続的である.

The purpose of this study is to clarify regeneration patterns of the beech (Fagus crenatd) forest on flat and sloping sites in N.E. Nagano Prefecture. Two 80m x 80m quadrates were established : on flat surface (FS) and on slope surface (SS), respectively. In each quadrate, forest structure, the number of seedlings, saplings and fallen trees, and the diameter of fallen trees (at 1.3 m from their roots) were surveyed. The mean plant coverages of subcanopy and herb layer at SS were higher than those at FS. In contrast, the mean plant coverages of second shrub layer and dwarf bamboo were higher at FS. Total basal area of all tree species was higher at FS, but there were more trees at SS. Coexistence analysis of beech showed that middle and small DBH beech coexisted at FS, but large DBH beech rarely coexisted with middle and small beech at FS. At SS, there was no similar relation of coexistence. Regarding the structure of both forests, the patchy structure of FS was clearer than that of SS. Moreover, the number of fallen trees was greater at SS, but their size was smaller there. Tree fall may occur more frequently at SS. Successors of beech rarely grow at FS because of a thick dwarf bamboo layer. This fact indicates that the regeneration at FS is discontinuous. On the other hand, the regeneration at SS seems to occur continuously, because successors of beech grow well under a less thick dwarf bamboo layer. The regeneration patterns of two types of beech forest were clearly different on FS and SS sites.

収録刊行物

  • 植生学会誌

    植生学会誌 18(1), 23-29, 2001

    植生学会

参考文献:  22件中 1-22件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110008145245
  • NII書誌ID(NCID)
    AA11347548
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13422448
  • NDL 記事登録ID
    6382723
  • NDL 雑誌分類
    ZR3(科学技術--生物学--植物) // ZU4(書誌・図書館・一般年鑑--専門書誌)
  • NDL 請求記号
    Z18-3499
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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