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FENNIA 66, N;o 4
39
be compared do not refer to exactly the same areas, but, the
differences in this respect are so small that they do not interfere with a
comparison to any extent worth mentioning.
If the southern and northern halves of the country are considered
separately, the growth in forests owned by companies and private
individuals (principally farmers) is slightly larger than in the State
forests. This is due to the greater abundance of old age-classes in the
State forests and to the considerably poorer quality of the forest soils
on an average. The same holds good with respect to the whole country.
Communal and church forests are situated on a much larger scale in
the southern half of the country, for which reason the average growth
per hectare is slightly larger in them than in the forests of the groups
of owners already referred to. The figure indicating the growth has
remained unchanged on the present occasion for forests owned by
companies and private individuals, but is slightly higher than in 1922—
23 as regards the State forests owing to the influence of North Finland.
The figures for communal and church forests are more uncertain than
the others owing to the small size of these ownership groups. The
forest areas acquired lately by communes are, perhaps, better on an
average than formerly as regards the quality of the soil which would
explain the increase in the growth. The churches, on the other hand,
probably have lost principally good forest land and young forests
owing to colonisation, which may be the cause of the reduced growth.
c. The total annual growth.
The total annual growth was calculated on the basis of the volume
of the different species of trees excluding bark and of the growth
percentages referring to them and on the other hand on the basis of
the forest areas and of the average figures indicating the growth per
hectare. The calculations were made separately for productive and
poor productive forest land. The total growth is given in a condensed
form in Table 24, in which the results of the survey in 1922—23 are
included for the sake of comparison.
The total annual growth of the forests of Finland without bark
amounts to 45.70 million m3. This figure is the mean result of slightly
differing calculations made in different ways. Of the total growth
4/5 refer to the southern half of Finland, so that only x/5 is left for the
northern half, although the latter embraces about 43 per cent of the
forest area of the country and about 32 per cent of the growing stock.
This is due to the comparatively barren quality of the forest soils in
North Finland and the abundance of old forests, in which the growth
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