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These yield tables were prepared for use in the management of, and the student practices in, the Sugi (CriPtomeria jaPonica D. Don) stands at the Kasuya Experimental Forest of the Kyushu University. ...The outline of the investigations for, and the preparation of, 'the tables is as follows: 1. Collection of Sample (1) Sample: Even-aged uniform forest of normal growth at the Kasuya Experimental Forest (2) Stand age: 15-80 years (3) Number of sample plots: 45 (4) Areas of sample plots: 0.87 a-16.91a (5) Criterion for classification of superior and secondary stands: Moderate thinning. II. Selection of Samples (1) One plot was omitted, as unsuitable stand by Wimmenauer's Theory. (2) The superior and inferior sites were classified by Baur's Continuous Curve Method and the mean values were obtained by the same method for unclassified sites. Samples of superior site: 26 plots Samples of inferior site: 18 plots Samples of mean site: 44 plots III. In the calculations of factors for the superior stands, the following equations were employed for the determination of constants. (1) Number of trees in the stand: $log N$ = 4.81863 - 1.09622 $log x$ where, N: number of trees x: stand age (2) Mean breast height diameter: $log D$ = 3.99683 0.854591091 $log N$ where, D: mean breast height diameter (3) Mean tree height: $log H$ = 0.15839+0.77159 $log D$ where, H: mean tree height (4) Stand form-factor: F = 0.31966 + 2.75114 ($\frac{1}{H}$) -5.65385 $($\frac{1}{H}$)^2$ where, F: stand breast height form-factor (5) Stand breast height area: G = N$D^2$$\frac{$ pi $}{H}$. (6) Volume of the stand: M = N$D^2$$\frac{$ pi $}{H}$$\times$H $\times$F 4 (7) Volume increment percentage: P = ($sqrt{ $\frac{M}{m}$}$-1) $\times$100 IV. Baur's Continuous Curve Method was mainly employed in the calculations for the secondary stands. V. The calculated values of the factors were tabulated into the local yield tables (1), (2) and (3) given at the beginning (of this paper).続きを見る
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Mendeley出力
KJ00005470469