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Practical Forestry in the Pacific Northwest - Protecting Existing Forests and Growing New Ones, from the Standpoint of the Public and That of the Lumberman, with an Outline of Technical Methods by Edward Tyson Allen
page 68 of 160 (42%)

Individual seed trees left in logging are not successful because
of shallow root system and almost certain windfall. Replacement
must be by seeding or planting, or by leaving small tracts of pine
surrounded by cleared fire lines to protect them when the slashing
is burned. The size and distance apart of these must be determined
by their situation and exposure to wind, considering both the danger
of windfall and the carrying of seed. Especially in younger growths,
the quantity of merchantable material tied up in this way is not
so great as is sometimes necessary in the case of red fir, where
single seed trees may contain several thousand board feet. On the
other hand, stumpage value may be high. For this reason artificial
replacement may often be more profitable, especially where there
is reasonable safety against recurring fire.

A thing to be borne in mind is that white pine seems to reach a
healthier and better development when mixed with a small proportion
of other species, such as cedar, tamarack, spruce, lodgepole pine
and Douglas fir, so there is no object in trying to produce an
absolutely pure stand. Some authorities think that 60 per cent
of pine, with the rest helping to prune it, is an ideal mixture.

LODGEPOLE PINE (_P. Murrayana_)

Present interest in private reproduction of this species hardly
warrants treating it at length in this publication, although
unquestionably it will eventually occupy a higher place in the
market than at present and its readiness to seize burned land in
many regions will make it a factor whether desired or not. Where
yellow pine will grow, the problem is most likely to be to discourage
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