Mean Crown Lengths of Japanese Cedar Trees in Overcrowded Mature Plantations

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  • 過密なスギ壮齢人工林における平均樹冠長
  • カミツ ナ スギ ソウレイ ジンコウリン ニ オケル ヘイキンジュカンチョウ

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We investigated the mean crown lengths of Japanese cedar trees in 12 overcrowded mature plantations. In pooling the data for unthinned young and overcrowded mature plantations, the mean crown length of Japanese cedar trees in each plantation was positively correlated with mean upper tree height in each plantation. However, the average mean crown length of trees in overcrowded mature plantations was 5.9 m, which was only slightly greater than that of trees in unthinned young plantations (5.4 m). Thus, if intensive thinning is not conducted, the crown lengths of mature trees will not steadily increase.

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