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

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Abstract: The report of the thinning study in the Oregon Coast Range includes a financial
analysis of representative thinning regimes.
601. Tarrant, R.F., B.T. Bormann, D.S. DeBell and W.A. Atkinson. 1983. Managing red alder in the
Douglas-fir region: some possibilities. Journal-of-Forestry 81(12): 787-792.
Keywords: planting operations
fertilization
yield
economics
Abstract: An economic comparison of 3 systems for growing Alnus rubra (rotations of
13,20 and 28 yr) in the Pacific Northwest USA, with or without alternating rotations (45 yr) of
Douglas fir, and 2 continuous systems for growing Douglas fir (45-yr rotations with or without
treatment with N fertilizer). Anticipated stand yield, and costs of site preparation, planting,
fertilization etc. were used to estimate m.a.i. (vol.), present net worth and internal rate of return.
The 2 most profitable systems were Douglas fir, thinned and treated with fertilizer twice in 45 yr
(present net worth $623/acre) and red alder grown to sawlog size (28 yr) alternating with Douglas
fir thinned twice in 45 yr (present net worth $578/acre). The least profitable system was red alder
grown continuously in 13 yr rotations (present net worth -$251/acre). Alternate cropping of red
alder and Douglas fir or continuous red alder production would be as profitable as growing
Douglas fir alone if there were increases in real interest rate, alder stumpage price, or the cost of
N fertilizer, or alder sawlog rotation length decreased.
602. Taylor, A.M., B.L. Gartner and J.J. Morrell. 2003. Co-incident variations in growth rate and
heartwood extractive concentration in Douglas-fir. Forest-Ecology-and-Management 186(1/3):
257-260.
Keywords: thinning
growth
wood quality
Abstract: Extractives can have a major impact on the properties of heartwood; however,
our understanding of the process of heartwood formation and extractives production is limited
and there are few data on how environment affects heartwood extractive content. This study
assessed the relationship between growth ring width and extractive content of heartwood in
Douglas-fir (Pseudotsuga menziesii [Mirbel] Franco) trees. The radial growth rates of the
sampled trees were variable over their 53-61 years, in part, because of recent stand thinning
treatment. The year that each heartwood increment was formed was estimated by assuming that
the trees maintained the same number of growth rings of sapwood in the past as they had at the
time of sampling. Growth ring width increased after the recent thinning and there was an
associated increase in the extractive content of the heartwood estimated to have been formed at
the same time. In addition, there appeared to be a rough correlation between growth ring width
and extractive content in the time before the thinning. These results suggest that silvicultural
treatments that affect growth rate may affect wood durability in Douglas-fir.
603. Tedder, P.L. 1981. Reforestation of steep sites with skeletal soils - is it economically realistic? In
Reforestation-of-skeletal-soils Ed. -.S.H. Hobbs, -OT. Oregon State University. pp. 105-108.
Keywords: planting operations
economics