Effects of Thinning on Stand Structure and Diameter Growth in Old and Overcrowded Japanese Cypress (<i>Chamaecyparis obtusa</i>) Stands

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  • 間伐が高齢級ヒノキ過密林の林分構造と成長に及ぼす影響
  • カンバツ ガ コウレイキュウ ヒノキ カミツリン ノ ハヤシ ブン コウゾウ ト セイチョウ ニ オヨボス エイキョウ

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We investigated the effects of tree thinning on stand structure dynamics and diameter growth in two old and overcrowded Japanese cypress (Chamaecyparis obtusa) stands over an 8-year period after thinning. One stand was subjected to canopy thinning and the other to suppressed tree thinning. The density of high-quality trees was 300 trees ha-1 in both stands after thinning, but in the stand that had been thinned of canopy trees the density of low-quality trees was still high. Height-to-diameter ratio decreased in the stand subjected to thinning of suppressed trees, whereas it increased in the stand subjected to canopy tree thinning. The annual relative diameter growth rate after thinning ranged from 0.70% year-1 to 1.17% year-1 and was 0.2% to 0.5% better than that before thinning. There are therefore cases in which thinning increases diameter growth, even in old and overcrowded stands.

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