スギ,ヒノキにおける樹冠位置に関係しての幹材積生長量の垂直的配分とそのモデル

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  • スギ ヒノキ ニ オケル ジュカン イチ ニ カンケイシテ ノ カンザイセキ

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Abstract

Sample trees were gathered from some plantations of Cryptomeria japonica and of Chamaecyparis obtusa with different growing stages. After they were felled, the vertical distributions of stem cross-sectional area increment were investigated in relation to the position of crown distinguishing between sunny and shaded part. There was one basic pattern common to both tree species, that is, the increment of stem cross-sectional area increased from the tip to the base of sunny part and bore approximately the same below that point regardless of the existence of shaded one, except particular trees which were isolated or extremely shortcrowned. This pattern proves that the sunny part of crown is contributable to stem volume increment, but the shaded part is not so. When stem volume increments were estimated by the model based upon this pattern, the errors were not so large. Judging from these results, it may be reasonable to use the crown dimensions of only sunny part as the indicator of stem volume increment.

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