Capitolo 37
fir, for example that we can know that it consists comparatively of the
few survivors of a near growth of sapling which the weak were
gradually killed out after having served their office to prune and
forcing the vigorous one. It only had the trees we now see state on the
their obstacles they would be unworthy apart firewood to burn. For the same
reason forest to plant artificial they have to be thick, even if the fillers
or trees of nanny can be of inferior kind if not of the so rapid growth
as to earn the dominion.
Nature teaches a lot of lessons that we have to recognize in artificial
management or it fails, but she is anybody more the better grower of forest
picked up that she is of agricultural crops. We have to study natural
methods of perpetuation of forest to see how they can be improved on
as much as to adopt them as models. As a rule the forest of virgin is
very ruinous of earth. The possibilities under intelligent
he/she takes care of it is not suitable from the average of nature, but from her accidental
better, and they also exceeds usually far this. An equitable comparison is
that of the scientific agriculture with non systematic gleaning from wild
and fields of untended. The general principles and precedents of forest
growth has very shortly been delineated intentionally as to serve
as a mere introduction to their question or change in
concrete cases.
MANAGEMENT OF SPECIFIC TYPES
Douglas Fir (taxifolia_ of _Pseudotsuga)
Comparative with more important commercial trees, the Northwest
Douglas fir is notably easy to reproduce. It is an abundant
sower, very quickly grows, and you/he/she occupies a region with every climatic
advantage. In the districts of fir typical of Oregon and Washington
earth deforested that it escapes going again fire you/he/she is usually supplied
naturally and with amazing rapidity.
The exceptions to this rule are where the destruction of trees of seed
you/he/she has been wide and absolute, where already competing established
kind is not removed with the original forest, and where the
fir sopravvivente is too much old man to sow. Two second conditions are