Stem Growths of Canopy and Sub-Canopy Trees in Natural Akamatsu (Pinus densiflora) Stands

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  • Kunisaki Takatugu
    Department of Forestry, Faculty of Agriculture, Kyushu University
  • Mizoue Nobuya
    Department of Forestry, Faculty of Agriculture, Kyushu University
  • Imada Morio
    Department of Forestry, Faculty of Agriculture, Kyushu University

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  • 天然生アカマツ林内の林冠木および亜高木の成長特性
  • テンネンセイ アカマツバヤシナイ ノ リンカンボク オヨビ アコウボク ノ セ

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Abstract

Growth, allometry, and biomass allocation to stem in canopy and sub-canopy trees in 70-year-old Pinus densilflora (Pinus) stands were studied at the Kyushu University Forest in Miyazaki. The purpose of this study was to collect basic information in order to construct a working system for natural Pinus stands. Sample trees of Pinus densiflora, Abies firma (Abies), Tsuga sieboldii (Tsuga) and Quercus mongolica var.grossesserralta(Quercus) were selected for stem analysis in the stands where tree species composition, stand density and size structure were different. The four species were compared for height and basal area growth. The results obtained were as follows. The canopy tree, Pinus had the greatest height and basal area growth rate, and sub-canopy trees of Abies, Tsuga and Quercus had a lower growth rate, The ratios of height to diameter at breast height had relatively low values for Pinus and Abies, and Quercus had the highest ratio values. For all species, there were trees whose biomass allocation to basal area growth decreased and biomass allocation to height growth increased greatly over short or long periods. Further, there were also sub-canopy trees (Tsuga and Quercus) whose biomass allocation to height growth decreased greatly. Size difference in basal area between Pinus and other species trees increased with stand development. However, size difference in height was approximately constant or increased very slowly, after size difference increased until Pinus reached 30 or 40-year-old. From these results, it was concluded that competition for light among intra-species trees and/or among inter-species trees might influence biomass allocation to stem and the growth in each species.

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