山陰地方における天然スギの直径分布

その他

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.