Phenological behavior of scale leaf shoots of Chamaecyparis obtusa sapling in a natural pine forest

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  • アカマツ林におけるヒノキ若木の鱗片葉の挙動
  • アカマツリン ニ オケル ヒノキ ワカギ ノ リンペン ヨウ ノ キョドウ

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Morphology and dynamics (activities, elongation, reproduction rate) of shoots of Chamaecyparis obtusa were studied in a pine forest. Length of scale leaf was longer in terminal than in lateral shoots. Leaf area of shoot increased linearly with the number of leaf-tips on a shoot in both terminal and lateral shoots and increasing rate was larger in lateral. Differences in morphology and behavior of scale leaves reflected the difference in spatial use between terminal and lateral shoots. Shoot elongation started in middle April and continued into early fall. Elongation of lateral shoot started earlier than terminal by 7 to 10 days. Period of shoot elongation was ca. 130 days. Activities, elongation, and reproduction rate of shoots were higher in upper crown and decreased toward base. Elongation was longer in terminal than in lateral shoots. Plasticity in morphology and dynamics of scale leaf shoots of C. obtusa was considered to be behavior basing on economics at each shoot level responding to heterogeneous light conditions in a crown. Morphology and dynamics of scale leaf shoots of C. obtusa were compared with other coniferous trees.

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