Changes of stem height-to-diameter ratio in hinoki (<I>Chamaecyparis obtusa</I>) young man-made stands

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  • ヒノキ若齢人工林における形状比の変化
  • ヒノキ ジャクレイ ジンコウリン ニ オケル ケイジョウヒ ノ ヘンカ

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Changes of stem height-to-diameter(at breast height) ratio (H/D-ratio) were studied for 1417 years before and after the tree crown closure on young four hinoki stands and a sugi stand in the southern Shikoku Island, Japan. In every stand, the larger D was, the smaller the H/D-ratio; and the relationships between them were expressed by a reciplocal expression for their each stand age. The average H/D-ratios of stand had been declining with height growth at the early stages. Before stand heights reached about 4.5 m, the ratios drastically declined at the rates of more than 10 per year. The ratios then touched bottom except that in one stand of hinoki established on the lowest-class site. Among the hinoki stands similar in tree-density, the minimum average H/D-ratios were relatively large and the average tree-heights of such H/D-ratio were small when the stands were established on the site of relatively high-class. The minimum average H/D-ratios were observed when crown heights kept almost steady on the high-class site ; but on the low-class site, such minimum ratio appeared after crown height markedly increased. After that, the average H/D-ratios became large in proportion as the mean tree heights increased.

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