Distribution of Nitrogen in Relation to Leaf Age within a Cyptomeria japonica Crown

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  • スギ樹冠における葉齢別の窒素分布
  • スギジュカン ニ オケル ヨウレイベツ ノ チッソ ブンプ

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The distribution of nitrogen with varying leaf age was measured in the crown of a six-year-old sugi(Cryptomeria japonica D. Don) tree at the edge of a stand. The nitrogen content (expressed on a weight basis) of current leaves was positively correlated with light intensity and decreased with increasing depth from the top of the crown. However, though the depth of the crown increased, the nitrogen content of leaves one or more years old did not decrease. Furthermore, the content did not decrease as leaf age increased. This demonstrated that nitrogen content of old leaves could be held constant in modeling canopy photosynthesis of sugi trees. Two reasons are suggested to explain why the nitrogen content of old leaves did not change. One is that the light intensity of old leaves was low. The other is that the nitrogen of old leaves was translocated to the new leaves. Since the nitrogen content of old leaves was lower than the value required for producing new leaves, nitrogen in old leaves may play an important role in supplying nitrogen to new leaves.

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