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26 Yrjö Ilvessalo, The Forest .’Resources’ of Finland in 1936—1938
It will be seen that the mean volume for private forests is slightly
higher, but for forests of other groups of owners lower than in 1922—
23. The drop in the mean volume of the State forests is evidently a
result of the fully justified regeneration of the very abundant
overmature forests which has been carried out on a considerable scale.
Apparently much thinning and, perhaps, also regeneration of
overmature forests has been undertaken recently in the forests owned by
wood-working companies and churches, which may be the cause of
the decrease in the mean volume, for it is a well-known fact that the
forests of these two groups of owners are in general carefully managed.
The reduction in the mean volume of the forests owned by companies
is almost entirely made good, if the former volume of the deciduous
trees is corrected. The mean volume of the forests of rural communes
and municipalities is considerably lower than in 1922—23. It should
be noted, however, that the land owned by communes and
municipalities has almost doubled since that time, so that the mean volume
does not refer to anything like the same areas as before. The communes
and municipalities may often have purchased private farms that were
in financial difficulty and the forests of which therefore were poorer
than the average.
The mean volume of the forests of different groups of owners cannot
be directly compared with each other as indicators of the condition
of the forests. The greater part of the State forests is situated in the
northern parts of the country and elsewhere, too, generally in the
most barren districts which is the cause of their low mean volume in
reference to the whole country. Private and church forests are the
best on an average in regard to quality of soil. Comparisons between
the mean volumes should be made at least approximately with regard
to the same districts and forest types, and this cannot be done until
later.
b. The total growing stock.
The mean volumes stated above and the areas of productive and
poor productive forest land had to be established in order to ascertain
the total volume of the growing stock. To facilitate a summary of
the total volume, Table 14 has been drawn up in a concise form, the
corresponding figures of the survey in 1922—23 being included for
the sake of comparison.
The total volume of the growing stock was thus established as
1 560 million m3. This is the result of several calculations made in
different ways and on different principles. Rather less than y3 of the
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