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H . KLOMP
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1.5
L O G C
FIQ. 4. The relation between the logarithm of trunk circumference (C) and the logarithm
of the number of shoots (st) present in the crowns of 45 trees felled in November 1954.
The regression function is log St = -0.312 + 2.346 log C.
As an example, the computation of B, in 1954 will be given. Accord1. the mean number of trees/m2,
2. the mean size of the trees 6 (trunk circumference between 1-50 and
3. the parameters of the relation log St = a + b log C.
ing to (Z), (3) and (5) we have to estimate:
1.60 m; eye level)
i. I n 177 plots of 25 m2 806 trees were counted, i.e. 0.1821 treeslma
(See Fig. 3-A, B).
ii. The trunk circumference of 806 trees has been measured. Figure 3-C
shows the enormous variability. c proved to be 38.21 cm in 1954.
iii. 45 trees were felled in November 1954 and the number of shoots
counted on each tree. The data are plotted in Fig. 4. The parameters
appeared to be a = -0.312 and b = 2.346.
Hence, according to (5)
and
log St = -0.312 + 2.346 log 38.21 = 3.40054
St = 2 515