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ŠUMARSKI LIST 5-6/1971 str. 27     <-- 27 -->        PDF

class IV Emrović´s tarif No 10 (or Algan´s No 17), etc. Naturally, this is valid for the
management unit »Josip Kozarac«. In other forests it may be different, especially
when there is a question of different site classes in individual age classes.


The present experiment tells us that in Oak stands with increasing age from
1 to 80 years the number of the Emrović´s tarif changes from 1 to 10 (or Algan´s
from 8 to 17). After the age of 80, i. e. when increasing the age from 81 to 140 years,
Emrović´s tarif changes from 11 to 12 (or Algan´s from 17 to 19).


For the purpose of completeness I should say right away that changing the
tarif for a degree will not affect significantly the increment magnitude, because the
increment is a derivation of the tarif line. We present in Tab. 2 the data concerning
the derivation of Algan´s tarifs No 17 and 18. In this Table the single figures designate
the volume increment of the mean tree which corresponds to a diameter increment
of 1 cm. From this Table it is visible that the volume increments differ from


one to another in the second or the third decimal.
Table 2.
Diameter
sub-class
Derivation of
No 17
the Algan tarif
No 18
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
0.0268
0.0477
0.0625
0.0804
0.0982
0.1161
0.1339
0.1518
0.1697
0.1875
0.2054
0.2232
0.2411
0.2589
0.2763
0.2947
0.3125
0.3303
0.0279
0.0463
0.0650
0.0836
0.1022
0.1207
0.1392
0.1578
0.1764
0.1950
0.2136
0.2322
0.2507
0.2693
0.2878
0.3064
0.3250
0.3436


The mentioned experiment has a practical usefulness also when choosing
the »Increment percent tables«, which were published in Šumarski List (Zagreb
1954), and in my book »Growth and increment of forest tree species« (Zagreb 1963).
In the first four age classes of Oak stands we should take into account the height
increment, and to apply accordingly take into account the height increment, and to
apply accordingly the following formula for the increment percent:


1000 1


D —5 T


In the remaining age classes it is allowed to disregard the height increment, and
the following formula can be applied:


1000 1
P = . —
D T