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

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tree/stand protection
thinning
commercial thinning
precommercial thinning
yield
economics
Abstract: Financial analyses of intensive and low-cost reforestation options are conducted
for loblolly pine (Pinus contorta) stands with broadleaved competition in the Southern USA, and
Douglas fir with red alder (Pseudotsuga menziesii with Alnus rubra) in the Pacific Northwest.
Results show that the expected present values (EPVs) of low-cost options that result in mixtures
of conifers and broadleaves are superior in some situations to the EPVs of the intensive options.
238. Hall, T.H., R.V. Quenet, C.R. Layton and R.J. Robertson. 1980. Fertilization and thinning effects
on a Douglas-fir ecosystem at Shawnigan Lake: 6 year growth response. Pacific-Forest-Research-
Centre, Canadian Forestry Service Information-Report BC-X-202. 31 p.
Keywords: fertilization
thinning
growth
Abstract: Further results are given for this stand in British Columbia at 30 yr old [see FA
43, 1945]. Gains in gross vol. increment (over control at 24 yr old) for the 200 initially largest
trees/ha were 20% for heavy thinning alone, 51% for heavy fertilizer (urea) application alone and
139% for heavy thinning plus heavy fertilizer application. Adjustments by covariance analysis for
differences in intitial stocking and tree size distributions gave values of 47, 76 and 139%
respectively.
239. Hamm, P.B., S.J. Cooley and E.M. Hansen. 1984. Response of Phytophthora spp. to metalaxyl in
forest tree nurseries in the Pacific Northwest. Plant-Disease 68(8): 671-673.
Keywords: nursery operations
tree/stand protection
tree/stand health
Abstract: In tests on Douglas fir (Pseudotsuga menziesii) at 2 commercial forest tree
nurseries in Ore., 1 application of Subdue (metalaxyl) suppressed root rot. Of 3 P. spp. isolated
from treated seedlings (P. megasperma, P. drechsleri and P. pseudotsugae), only P. pseudotsugae
decreased in isolation frequency because of the fungicide. Survival of P. spp. in infected
seedlings remained high after treatment. At 1 nursery, 10 months after the first application, P.
spp. were isolated from 92% of the seedlings across fungicide treatments, whereas at the 2nd
isolation frequencies from seedlings were 77, 70, 29 and 13%, respectively, after 0, 1, 2 and 3
applications. P. was recovered from previously healthy seedlings 8 wk after they were
transplanted into naturally infested, metalaxyl-treated soil.
240. Han, H., L.D. Kellogg, G.M. Filip and T.D. Brown. 2000. Scar closure and future timber value
losses from thinning damage in western Oregon. Forest-Products-Journal 50(1): 36-42.
Keywords: thinning
tree/stand health
economics