Role of land-surface disturbance in regeneration of <I>Ulmus davidiana</I> var. <I>japonica</I> in a cool temperate deciduous forest on Mt. Asama, central Japan.

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  • Kon H.
    Hokkaido Forestry Research Institute Donan Branch Station
  • Okitsu S.
    Laboratory of Forest Ecology, Faculty of Horticulture, Chiba University

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Other Title
  • 浅間山麓の冷温帯落葉樹林におけるハルニレの更新に果たす地表撹乱の役割
  • 浅間山麓の冷温帯落葉樹林におけるハルニレの更新に果たす地表攪乱の役割
  • アサマ サンロク ノ レイオンタイ オチバ ジュリン ニ オケル ハルニレ ノ コウシン ニ ハタス チヒョウ カクラン ノ ヤクワリ

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Abstract

The role of land-surface disturbance in the regeneration of Japanese elm (Ulmus davidiana var. japonica) was studied in a cool temperate deciduous forest on a sideslope of Mt. Asama, central Japan. The study plot could be divided into two parts across the break line of the slope, the upper and the lower slope. The former was stable sites with no land-surface disturbances, while the latter was unstable sites with land-surface disturbances such as slope failures. Japanese elm was confined to the unstable lower slope, it was rare on the stable upper slope. The spatial distribution of the seedling and young trees indicated that Japanese elm regenerated on the depositional areas of the slope failures. Its young trees were low tolerant. But once reached the canopy layer, it survives more than 200 years. The regeneration of Japanese elm depends on periodic, massive land-surface disturbance such as mass movements, landslide, slope failure, flooding, volcanic ash deposition, which create favorable conditions for the establishment, with the canopy disturbance.

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