Stand structure for secondary Pinus densiflora-Tsuga sieboldii & Abies firma forests in the central mountainous area of Kyushu, southern Japan

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  • 九州中部山岳地帯におけるアカマツ-ツガ・モミ二次林の林分構造
  • キュウシュウ チュウブ サンガク チタイ ニ オケル アカマツ ツガ モミ 2

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Species dominance, size structure and DBH-height relationship for three Pinus densiflora (Pd)-Tsuga sieboldii & Abies firma (Ts&Af) secondary stands of different age (Pd's age ≧ 70-year-old) were investigated. The canopy layer comprised Pd and Ts&Af for all stands. Species dominance changed with stand development; Pd decreased and Ts&Af and tall broad-leaved tree groups increased. Size difference in DBH between Pd and Ts&Af increased, but size difference in height decreased with stand development. DBH distribution was rotated sigmoid or concave, and height distribution bimodal or rotated sigmoid on semi-logarithmic scale. Size hierarchy of DBH amd height distribution developed with stand development. DBH-height relationships were analyzed using the reciprocal equation. Parameter A of this equation, representing relative height growth of understory trees, indicated the same value for all stands, but H^*, representing maximum height of a stand, varied between stands. The pattern of Pd stand development in this area was examined, analyzing the data for three middle-aged Pd stands (stand age from 39 to 71-year-old) and three Pd-Ts&Af stands in this study. As a result, it is thought that Pd stands would shift to Ts&Af stands in the future, because height difference between Pd and Ts&Af decreases with stand development and Pd is eliminated by Ts&Af under interspecies competition at the older age than 70-year.

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