太平洋側北限域におけるタブノキ純林と混交林の林分構造と更新 Structure and regeneration of a mixed evergreen broad-leaved stand and a pure stand of Persea thunbergii at its northern limit along the Pacific Ocean, Japan.

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  1.照葉樹林の太平洋側北限域に位置する近接した宮城県椿島と八景島において,北限域のタブノキ純林と混交林の林分構造と更新様式を比較検討した. <BR>  2.タブノキ純林の椿島では,タブノキの胸高断面積合計による相対優占度が約9割を占めていた.樹高分布は上層をタブノキ,下層をヤブツバキが占める2層構造を示した.タブノキ幼樹(樹高1.3m以上胸高直径5cm未満)は1 haあたり662本存在したが,その85%は萌芽由来であった. <BR>  3.八景島はタブノキ,ユズリハ,モチノキが胸高断面積合計で3 : 1 : 1の割合で混交している林分であった.明瞭な階層構造を持たず,連続的な樹高分布を示した.1 haあたり1055本のタブノキ幼樹が存在し,そのほとんどが実生由来であった. <BR>  4.両林分の林冠ギャップ率には大きな違いが見られなかったが,光環境には有意な差が見られ,タブノキ純林よりも混交林の方が良好であった.この光環境の違いは階層構造の違いによると推察され,混交林では複雑な階層構造がタブノキの良好な実生更新を促していると考えられる.

We compared the stand structure and regenerative conditions of Persea thunbergii on a mixed and a pure P. thunbergii forest on two neighboring islands of northeastern Japan along the Pacific Ocean. The relative dominance of P. thunbergii at the basal area exceeded 0.9 in a pure stand on Tsubaki Island. The height distribution of trees was bimodal ; one peak was the upper layer occupied by P. thunbergii, and the other was the lower layer occupied by Camellia japonica. There were 662 (/ha) saplings (height≧1.3m and DBH<5cm) of P. thunbergii, 85% of which originated from sprouts. In a mixed stand on Yakei Island, three evergreen broad-leaved trees, P. thunbergii, Daphniphyllum macropodum and Ilex integra, were the major canopy species. The relative dominance of these three species at the basal area was 0.45 (P. thunbergii}, 0.19 (D. macropodum}, and 0.16 (I. integra}. The mixed stand had a continuous tree-height distribution. There were many saplings (1055/ha) of P. thunbergii, and most of which were raised from seeds. Significantly more light was available in the mixed stand than in the pure stand, although there was no difference in the gap rate between the two stands. This difference in the light environment may arise from the differences in stand stratification. Thus, the heterogeneity of stratification may promote recruitment into saplings in a mixed forest, in contrast to a pure forest.

収録刊行物

  • 植生学会誌

    植生学会誌 17(1), 23-30, 2000

    植生学会

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各種コード

  • NII論文ID(NAID)
    110008145235
  • NII書誌ID(NCID)
    AA11347548
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13422448
  • データ提供元
    CJP書誌  CJP引用  NII-ELS  J-STAGE 
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