36 伐根の直徑から胸高直徑を想定する一方法に就て
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概要
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It shall be too fast to decide the abandonment of an experiment in forest by the only one reason that the field notes were lost by accidents but there remain on the ground the stubs of tree, which have ever been removed, actually in the stand. This papers are made to report about the method mentioned above as the title, and is practised aiming to recover the contents of field notes, although to a certain extent, lost under the airraid during the Pacific War, 1941 - 1945.A. Species : "Sugi" (Cryptomeria japonic D. Don) and "Hinoki" (Chamaecyparis obtusa S. et Z.).B. Number of trees measured : For "Sugi" (Cryptomeria) 283 trees and for "Hinoki" (Chamaecyparis) 280 trees are measured. The breastheight diameter covers the range of 6 cm - 44 cm for "Sugi, " and of 7 cm - 33 cm for "Hinoki, " and the stub - diameter for "Sugi" covers the range of 9 cm - 59 cm and of 10 cm - 46 cm for "Hinoki."C. Location where the data collected : Oneyama forest, Goryo, Usuimachi, Usuigun, Gumma Prefecture, belongs to the administration of Maebashi Divisional Forest Office, Maebashi District Forest Office.The course of investigation.Note : In this paper the letter (D) means the stub - diameter, and D means the breastheight - diameter.A. Statistical relations : The linearity of regression has been discussed as the Table 2 shows. By the results author broadly can recognise that the relation between (D) and D nearly be linear. Thus, the following relation can be assumed, namely, D = k (D) and k is always smaller than 1. Then, log D = log k + log (D)∴ log k = log D - log (D)B. Calculation : The calculation of the value of k is shown in the Table 3,in which the k for "Sugi" (Cryptomeria) is obtained only. After the similar course of calculations the k for "Hinoki" (Chamaecyparis) and for the total of "Sugi" and "Hinoki" the values of k are obtained as 0.72484 and 0,72229 respectively.C. Discussion : The comparison of the real mean values of D for each (D) and the values of D' obtained from the formula D = k (D) is shown in Table 4. A, B, and C, and plotted in Plate 1,2,and 3. Thus, the author guess to propose that this method shall be recommended practically as one by which the breastheight diameter can be obtained from the diameter of stub remained on the ground of stand.
- 日本森林学会の論文
- 1949-08-30
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