IntensIve sIlvIculture - Forest Science Labs - Research Network ...

Abstract: Residual stand damage was measured on 25% of an area that had been thinned
with a cut-to-length logging system. Total damage (scar area) per acre was less than in any
similar study in the Pacific Northwest, although 39.8% of the residual trees sustained some
damage. Only 0.8% of the trees, however, sustained significant damage. Western hemlock (Tsuga
heterophylla) was more susceptible to damage than Douglas fir (Pseudotsuga menziesii). Most of
the damage occurred within 15 feet of a trail centreline and originated within 3 feet of the
groundline. Early summer logging may have resulted in more damaged trees than might occur
during other seasons. Future volume loss due to decay is likely to be minimal because a low
percentage of scars were considered vulnerable to wood-decaying fungi.
53. Binkley, D. 1984. Importance of size-density relationships in mixed stands of Douglas-fir and red
alder. Forest-Ecology-and-Management 9(2): 81-85.
Keywords: thinning
growth
tree/stand health
Abstract: Pairs of Douglas-fir, and Douglas-fir and red alder (Alnus rubra) stands were
examined at four locations (in Oregon, Washington and British Columbia) for patterns in average
tree size as a function of stand density. On fertile sites, the mixed stands experienced higher
mortality than the pure conifer stands. On infertile sites, the pure conifer stands were well below
the maximum tree size and density relationship compared to fertile sites or mixed stands,
suggesting under-utilized site resources were available for nitrogen-fixing alder.
54. Binkley, D. and P. Reid. 1984. Long-term responses of stem growth and leaf area to thinning and
fertilization in a Douglas-fir plantation. Canadian-Journal-of-Forest-Research 14(5): 656-660.
Keywords: fertilization
thinning
tree morphology
carbon allocation
growth
Abstract: Replicated thinning and nitrogen fertilization plots in a 53-year-old plantation in
Washington State were examined for repsonses in stem growth, leaf area, and stem growth per
unit leaf area. Although measurements occurred 20-30 yr after plot installation, substantial effects
from the various treatments were still present. Thinning reduced leaf area of the stands but
increased stem growth per unit leaf area, resulting in little difference in stem growth per ha over
the 5-yr measurement period (1977-81). Fertilization increased both stand leaf area and stem
growth per unit leaf area, and more than doubled 5-yr stem growth per ha. Consideration of the
role of leaf area and stem growth per unit leaf area in determining stand treatment responses may
account for much of the variation found among replicates of treatments or between studies on
different sites.
55. Binkley, D. and P. Reid. 1985. Long-term increase of nitrogen availability from fertilization of
Douglas-fir. Canadian-Journal-of-Forest-Research 15(4): 723-724.
Keywords: fertilization
growth
tree physiology
soil properties
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