|
This method cuts all trees except for a few "seed trees"
and will eventually produce an even-aged stand. These trees are
left to provide seed for regeneration. The Seed Tree method differs
from clearcutting in that the source of seed remains in the cutting
area. It differs from the shelterwood techinque because the remaining
trees in a seed tree cut do not alter the microclimate of the ground
(by providing shade, thus trapping moisture and ameliorating temperature
fluctuations). The seed trees are often harvested after regeneration
has established.
Practically,
there are often too few seed trees left to be of much use in generating
new trees. There is also some site preparation needed to promote
new tree growth when using this treatment.
Trees to be
left are selected based on their species, fecundity, and wind-firmness.
They can often be determined by a high live crown ratio, robust
trunk, and dominant canopy position. They are usually left evenly
distributed in the stand, though sometimes they are left in a row
or group to make it easier not to cut them during the harvest and
make them easier to harvest after regeneration has reached an acceptable
level.
See a before
and after shot of a seedtree
treatment done at the Stone Valley Experimental Forest.
|