Thinning young timber stands in mountainous terrain
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The Forest Engineering Department, Oregon
State University, has evaluated several
systems for thinning young timber stands on
steep terrain. Stands averaged 35 to 40
years old and 25.4 to 35.6 cm (10-14 in.)
dbh. Approximately 40 percent of the stems
per hectare were removed in the thinning
operations. This paper discusses research
findings from 1972 to 1979 on felling and
bucking as well as yarding. Felling and
bucking production increased with thinning intensity. Tractor yarding production
decreased with increasing slope percent.
Total skyline logging cost ranged from 1.5
to 1.67 times that of tractor logging on
slopes up to 40 percent. Prebunching logs
to the skyline corridor increased yarding
production for the machine on the landing.
Using intermediate supports has extended
yarding distances on convex slopes for
short towers such as the Igland-Jones
Trailer Alp.