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FENNIA 66, N;o 4
37
As the figures in the table show, the growth is relatively highest in
West Finland. If the southern and northern halves of Finland are
compared, it will be clearly recognised that the yield of the forests is
much larger in the former — almost twice as large. This is due to the
poorer quality of forest soils and comparatively very rich old forests,
in which the growth percentage is already low, in North Finland.
b. The average annual growth per hectare.
The average annual growth per hectare on productive and poor
productive forest land and on the whole forest area is given in Table 22,
in which the corresponding figures according to the survey in 1922—23
are included for the sake of comparison.
The average annual growth for the whole country is 1.84 m3 per
hectare of forest land, 2.21 m3 per hectare of productive forest land
and 0.4 8 m3 per hectare of poor productive forest land. All these
figures are slightly higher than those of the survey in 1922—23. The
variation is, however, on the whole well within the limits of the
difference referred to above due to the method of calculation, especially
if it is considered that the poorest productive forest land is now
classified as poor productive forest land. Consequently the growth proves
to be almost exactly the same as 15 years ago. The figure for the
growth on poor productive forest land has risen, especially if taken
relatively. This is probably partly due to the fact already mentioned,
viz., that the poorest of the productive forest land has been
transferred to the class of poor productive forest land and the poorest of
the poor productive forest land to the class of waste land, and partly
to the revival of growth due to the drainage of poorly growing swamps
suffering from wetness. The differences to be observed in the former
and the present survey are not always similar, owing to the different
changes that have taken place in regard to the area of productive and
poor productive forest land.
If the different parts of the country are studied separately, features
differing in some respects from the foregoing are visible. The figure
indicating the growth in West Finland is now slightly higher than
formerly. The difference is greater than is caused by the method of
calculation, so that a slight improvement seems probable. In East
Finland, on the contrary, the growth is obviously rather less than that
indicated by the survey in 1922—23. This is probably due to the
reduction of the volume already referred to, which is apparently caused
principally by abundant cutting of old forests and by the fact that the
growth of young forests that were very general in a large part of East
Finland in 1922—23, has decreased as the forests have grown older.
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