Bulletin of the Faculty of Agriculture, Shimane University

Faculty of Agriculture, Shimane University

ISSN:0370-940X

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Use this link to cite this item : https://ir.lib.shimane-u.ac.jp/3817

Bulletin of the Faculty of Agriculture, Shimane University 2

1968-12-15 発行

山陰地方における天然スギの直径分布

On the Diameter Distribution for Natural Regenerated "SUGI" (Cryptomeria japonica D. DON) in San-in District

Yasui, Hitoshi

Okimura, Yoshito

Miyake, Noboru

Ishii, Hiroshi

Fujie, Isao

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d0030002n013.pdf 715 KB

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This paper discribes an exprssions of diameter distribution that was reserched for the natural regenerated "SUGI" in uneven-aged stands on the Sanbe and Hikimi forest, Shimane Prefecture.
In an uneven-aged stand, the curve of numbers of trees plotted over dbh approaches an inverse J-shaped form, and this is a essential characteristic of an uneven-aged distribution. To determine whether a given diameter distribution was balanced or not, H. A. Meyer suggested plotting numbers of trees over dbh on semi-logarithmic paper. But the actual data shown that uncomform to this relationship as Fig. 1 and 2.
Hence, we fitted Pearson's frequency distribution function for the these distribution, and decided that 1 type of the distribution curve. The results of calculated was as follows.
Sanbe y = 5.14x^<-0.29101> <(12.88-x)>^<1.48863>
Hikimi y = 4.83x^<-0.35417> <(13.34-x)>^<1.49367>
The both equations confimed that well-iftting at statistic test.

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d0030002n013.pdf 715 KB

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