西南日本の江田島における山火事後20年間の遷移過程と種組成 Species composition through twenty years post-fire succession on Etajima Island, southwestern Japan

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広島県の江田島の山火事跡地において,5個の永久方形区の種組成の変化を20年間に渡って調査した.山火事跡地の2次遷移は,残存種による再生からはじまり,初年度の1年草の侵入とその後の消滅,新たな木本種の侵入という過程であった.亜高木層の発達は萌芽再生した広葉樹を中心としていたが,18年後には高木層ではアカマツの優占状態を生じた.山火事跡地でのアカマツ林の再生を実際に確認することに成功し,従来の比較年代から推定されていた遷移系列を永久方形区の経年調査により実証した.

Species composition in 20 years post-fire succession on Etajima Island, southwestern Japan was investigated in five 100m^2 permanent plots based on phytosociological analysis. Twenty plant species that regenerated from sprouting organs and burned stem bases a year after the fire, consistently developed in 20 years. Therophytes such as Erigeron sumatrensis, Crassocephalum crepidioides, and Erechtites hieracifolia predominated the area and were found only in year 1. Among the invading plant species, hemicrypthophytes dominated in the shrubby stage before the young pine forest started to develop. Establishment of herbaceous plants prevailed during the shrubby stage and thereafter, the growth of such woody species as nanophanerophytes, microphanerophytes, and mesophanerophytes was improved. The diversity index of vegetation increased linearly after the fire and peaked in year 4. The index continued to rise and reached the maximum when the tree layer was developed. Seedling emergence and establishment of Pinus densiflora in the subtree layer was comparatively late compared to other broad-leaved trees. However, the susceptibility of pines to disturbance, such as fire, and their tolerance to nutrient deficient soils allowed them to enlarge their crowns and started to enter the tree layer in year 18. There was no temporal variation on the cyclic regeneration of pine forest in the area two decades after the fire. This could be traced to the frequency of fire in the region occurring in spring where pines susceptibility to fire is high due to their low foliar moisture content.

収録刊行物

  • 植生学会誌

    植生学会誌 20(1), 17-30, 2003

    植生学会

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各種コード

  • NII論文ID(NAID)
    110007522338
  • 本文言語コード
    ENG
  • 資料種別
    雑誌論文
  • データ提供元
    CJP引用  NII-ELS  J-STAGE 
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