Effect of topography on the altitudinal patterns of alpha, beta and gamma diversities in tree communities of Shiiba Research Forest

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  • Akesaka Masaki
    Educational course of Forest Environmental Science, Department of Agro-environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Enoki Tsutomu
    Division of Forest Environmental Science, Department of Agro-environmental Science, Faculty of Agriculture, Kyushu university
  • Kaji Kiyohiro
    Kyushu University Forest
  • Yamauchi Kohei
    Kyushu University Forest
  • Ogata Taketo
    Kyushu University Forest
  • Cho Keiichiro
    Kyushu University Forest
  • Tashiro Naoaki
    Division of Forest Environmental Science, Department of Agro-environmental Science, Faculty of Agriculture, Kyushu university
  • Hishi Takuo
    Division of Forest Environmental Science, Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University

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Other Title
  • 宮崎演習林における樹木群集のα，β，γ多様度と標高との関係に地形が及ぼす影響
  • ミヤザキ エンシュウリン ニ オケル ジュモク グンシュウ ノ a,v,gタヨウド ト ヒョウコウ ト ノ カンケイ ニ チケイ ガ オヨボス エイキョウ

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To clarify the effects of topography on the pattern of tree species diversity along the elevation in the Shiiba Research Forest, Kyushu University, we randomly sampled 50 plots from the 125 vegetation survey plots and analyzed variations of the estimated number of species in the region (γ diversity), the number of species in each plot (α diversity), and inter-plot diversity indicating the species turnover among plots (β diversity, β = γ/α) along altitudinal and topographical gradients. γ diversity did not decrease with altitude and tended to increase with elevation range sampled. This suggested that cold stress was not severe enough to reduce the regional species richness in this site, while species composition changed along altitudinal gradient. β and γ diversities increased with range of slope inclination sampled. This suggested that different disturbance regime with slope inclination such as frequency of slope failure could contribute to the species turnover along the topographical gradient.

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