Relationships between leaf dynamics and photosynthetic capacity in Phyllostachys bambusoides Sieb. et Zucc.

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  • マダケ（Ｐｈｙｌｌｏｓｔａｃｈｙｓ　ｂａｍｂｕｓｏｉｄｅｓ　Ｓｉｅｂ．ｅｔ　Ｚｕｃｃ．）のかんの葉群動態と個葉の光合成特性について
  • マダケ(Phyllostachys bambusoides Sieb. et Zucc.)の稈の葉群動態と個葉の光合成特性について
  • マダケ Phyllostachys bambusoides Sieb et Zucc ノ カン ノ ヨウグン ドウタイ ト コ ヨウ ノ コウゴウセイ トクセイ ニ ツイテ

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Abstract

Seasonal change of leaf number, morphological characteristic of leaves, and photosynthetic rates were measured in Phyllostachys bambusoides. The leaf fall and leaf emerging occurred rapidly and simultaneously from April to May. Young culm retained high leaf density. Old culm retained low leaf density and tended to hold old leaves at high ratio. Therefore, we considered that leaf exchange rate decreased and the leaf longevity increased with an increase of culm age. One year culm had the thickest and largest leaves. Leaves became thinner and smaller with an increase of culm age. Maximum net photosynthetic rates decreased with an increase of culm age. Therefore, the negative correlation was detected between leaf exchange rates and photosynthetic rates, among the culms with different age, which suggested the existence of the trade-off relations.

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