Environmental factors controlling vegetation pattern on block slope around Sensui Pass, the South Japan Alps

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  • Ikeda Fumie
    Graduate School of Environment and Information Sciences, Yokohama National University
  • Kikuchi Takao
    Graduate School of Environment and Information Sciences, Yokohama National University

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  • 南アルプス仙水峠周辺における岩塊斜面上の植生分布の規定要因
  • ミナミアルプス センスイトウゲ シュウヘン ニ オケル ガンカイ シャメンジョウ ノ ショクセイ ブンプ ノ キテイ ヨウイン

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The block slope is the major land-forms which determine vegetation patterns in the subalpine zone. We surveyed vegetation pattern, micro-topography, and the surface materials on the block slope located around Sensui Pass in the South Japan Alps, in order to examine the site factors causing the vegetation pattern on block slope. The plant communities on the block slope were physiognomically classified into three types: the forest type with a continuous canopy of Abies veitchii, A. mariesii, etc., the scrub type with a continuous vegetation cover of Tuga diversifolia, Pinus pumila, etc., and the desert type with patches of scrub. The desert type was classified into two subtypes by patch size: the large patch subtype and small patch subtype. The forest type was found on slopes affected by temporal dissection, or around the knick lines and small ridges. The scrub type and the desert type with large patches were distributed on the lobes in the middle and lower part of the block slope. The desert type with small patches was distributed on the frontal side of lobes and linear troughs. The inorganic interstitial fine materials were found most frequently on the forest type and less frequently on both the scrub type and the desert type with large patches. On the desert type with small patches, a fine grain substance layer was not found, and the colonizing trees were dwarf growth-form. We concluded 1) that the difference in conditions of the surface materials causes the vegetation pattern on block slope and 2) that the presence or lack of inorganic interstitial fine materials has contribution to the establishment and development of the plant communities.

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