doi: 10.1093/wjaf/5.2.z1pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1990 by Society of American Foresters
doi: 10.1093/wjaf/5.2.z3pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1990 by Society of American Foresters
doi: 10.1093/wjaf/5.2.35pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1990 by Society of American Foresters
doi: 10.1093/wjaf/5.2.36pmid: N/A
Article PDF first page preview Close This content is only available as a PDF. © 1990 by Society of American Foresters
doi: 10.1093/wjaf/5.2.37pmid: N/A
Abstract A 28-year thinning study in a dense, natural, high-site coastal Douglas-fir (Pseudotsuga menziesii) stand compared three thinning treatments and an unthinned control. Gross, net, and total recoverable periodic cubic volume increments from the control treatment were not significantly different from the highest yielding thinned treatment. An increasing reserve basal area thinning treatment was the least severe thinning treatment and produced the highest gross, net, and total recoverable periodic increments of the thinning treatments. Commercial thinnings of dense or fully stocked plantations of Douglas-fir may produce similar results: vigorous stands with rapid growth potential. West. J. Appl. For. 5(2):37-40, April 1990. This content is only available as a PDF. © 1990 by Society of American Foresters
Yanchuk, A., D.;Carlson, M., R.;Murphy, J., C.
doi: 10.1093/wjaf/5.2.40pmid: N/A
Abstract Two 8-year-old grafted ramets from 12 lodgepole pine (Pinus contorta var. latifolia) ortets (wild stand parent trees) were sampled at each of three sites and were assessed for specific gravity with small diameter cores. The broad-sense heritability estimate from the analysis of variance was 0.62, but estimates derived by regressing clone means from ramets on ortet values were 0.49 and 0.54 for juvenile and mature wood, respectively. This relatively high repeatability for specific gravity suggests wild-stand ortet values may be useful for identifying low specific gravity clones in seed orchards, or potential low specific gravity families in breeding populations of lodgepole pine. West. J. Appl. For. 5(2):40-42, April 1990. This content is only available as a PDF. © 1990 by Society of American Foresters
Lilieholm, R., J.;Davis, L., S.;Heald, R., C.;Holmen, S., P.
doi: 10.1093/wjaf/5.2.43pmid: N/A
Abstract After 20-28 years of single tree selection harvests in initially irregular even-aged stands, stand structure is approaching a target uneven-aged diameter distribution. Seedling stocking in managed stands is nearly three times greater than that of unmanaged stands. Although shade-tolerant species comprise the bulk of most size classes in both managed and unmanaged stands, selection harvests have resulted in adequate quantities of seedlings from all five conifer species, including pines. In managed stands, current small-tree stocking and rates of growth appear adequate to sustain single tree selection harvests over much of a 90-year growth simulation. Simulated peak growth rates of uneven-aged stands compare favorably with actual and anticipated yields from the forest's uneven- and even-aged stands. West. J. Appl. For. 5(2):43-47, April 1990. This content is only available as a PDF. © 1990 by Society of American Foresters
Hawksworth, Frank, G.;Geils, Brian, W.
doi: 10.1093/wjaf/5.2.47pmid: N/A
Abstract Tagged ponderosa pines (Pinus ponderosa var. scopulorum) were examined at Grand Canyon National Park, AZ, to determine 32-year survival rates in trees with various intensities of dwarf mistletoe (Arceuthobium vaginatum subsp. cryptopodum). Survival was influenced mainly by dwarf mistletoe severity, but also by tree diameter. More than 90% of the uninfected and lightly infected (Dwarf Mistletoe Rating Class 1) trees survived the 32-year study period. However, only 5% of the heavily infected (DMR Class 6) trees over 9 in. dbh, but none of those in the 4-9 in. class, survived the period. The mean longevity, or period during which half the trees are expected to die, for Class 6 trees was 10 years for trees over 9 in. and 7 years for smaller ones; comparable figures for Class 4-5 trees were 25 and 17 years, respectively. West. J. Appl. For. 5(2):47-48, April 1989. This content is only available as a PDF. © 1990 by Society of American Foresters
Minore,, Don;Weatherly, Howard, G.
doi: 10.1093/wjaf/5.2.49pmid: N/A
Abstract The effects of five yarding-slash treatment combinations on Douglas-fir (Pseudotsuga menziesii) growth and survival were compared by obtaining seedling heights, potential seedling heights, survival percentages, soil-penetration resistances, and the occurrence of visible soil-humus for 149 progeny-test plantations in western Oregon. Survival was not improved by mechanical site preparation, and seedlings grown on the compacted, low-humus soils associated with piling slash off site did not grow as tall during their first 5 years as seedlings growing on similar sites where slash had been broadcast-burned. Tilling (disking or ripping) did not benefit seedling height growth. West. J. Appl. For. 5(2):49-51, April 1990. This content is only available as a PDF. © 1990 by Society of American Foresters
Zasada, John, C.;Tappeiner II, John, C.;Max, Timothy, A.
doi: 10.1093/wjaf/5.2.52pmid: N/A
Abstract Bigleaf maple is a common hardwood in western Oregon and Washington. Stored seeds from this species are generally believed to lose viability within a few weeks. In this study, two experiments were conducted with seeds collected in 1986 and 1987 in the Oregon Coast Range west of Corvallis, OR. Seeds collected in 1986 had a field moisture content (percentage of dry weight) of 49% and in 1987, 16%. The viability of the seed with the lowest moisture content declined from 75 to 60% during 1 year of storage at 1°C; the seed with the highest moisture content declined from about 90 to less than 10% viability. Storing the seeds at -10°C did not increase viability. Stratification of seeds for more than 60 days did not appear to increase germination. West. J. Appl. For. 5(2):52-55, April 1990. This content is only available as a PDF. © 1990 by Society of American Foresters
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