(1)杉針葉形態の樹齢變化に就て

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1) This investigation was carried out in 1944. at Makinosaki national forest, which shows a selection forest type, in Oga Peninsula, Miyagi Prefecture, to explain the variation of needle leaves forms of Sugi (Cryptomeria japonica D. DON) according with the age. 2) Of one year old leaves on each test tree, six factors were measured : Number of leaves, Density of leaves. Shoot angle of a leaf, Curve ratio of a leaf, Length of a leaf and Length of green shoots (annual spirally leaves part). By the result of stem-analysis on some test trees, their average age and diameters are measured and compared. 3) The result of this investigation tells that the form of leaves is variable according to the age of the tree. Among six factors (measured), denaity, curve ratio and shoot angle of the leaf have high correlation (Fig. 1. 3.), next comes the length of green shoots (Fig. 4.), though the number of leaves and the length of leaf are the lowest in correlation than other factors (Fig. 5. 6.) 4) In order to judge the most important factor, on my former comparative investigation, Pacific side type of Sugi and Japan sea side type, I used"Type difference"by PONIATOWSKI. In that case, the type differences number of the curve ratio, shoot angle of leaf and density of leaves were the largest, length of green shoots and length of leaf next, the number of leaves smallest. 5) As the result of comparing the correlation and the type difference on each factor (Tab. 1.), at least, curve ratio, shoot angle of leaf and density of leaves have high correlation with the age of tree, though it may be said that they are more important than other factors. Therefore, the writer of this paper have explained that the designation of the leaves form by the number, without regard to the age of the tree, would be of little value.
一般社団法人日本森林学会の論文
1949-02-28

(1)杉針葉形態の樹齢變化に就て

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