Treesearch

Recent quantification of engineering properties and index values of dominant soil types in the Alexander Archipelago, southeast Alaska, have revealed consistent diagnostic characteristics useful to evaluating landslide risk and subgrade material stability before timber harvesting and low-volume road construction. Shear strength data are summarized and grouped by Soil Conservation Service soil series, by the Unified Soil Classification system, and by geologic origin. Such groupings allow the selection of strength parameters for slope and subgrade stability analyses based on existing...

The microbial and chemical properties of log ponds along the Oregon coast were investigated. The log ponds were highly eutrophic, containing high concentrations of ammonium and nitrate nitrogen, phosphate, and organic compounds. Because of large microbial populations, the biochemical oxygen demand was high and dissolved oxygen was low. Bacterial species in log ponds were relatively similar to those found in streams with rich nutrient content. Most of the fungi in log ponds were lymabiont and lymaphilous. Some fungal species reportedly associated with fish disease were present in log ponds...

Provides current information on lumber and plywood production and prices; employment in the forest industries: international trade in logs, lumber, and plywood; volume and average prices of stumpage sold by public agencies; and other related items.

Chemicals were applied once to the root collars of small-diameter ponderosa pine (Pinus ponderosa Dougl. ex Laws.) to prevent mortality caused by Armillaria obscura (Pers.) Herink Roll-Harisen (A. meilea sensu lato). After 10 years, none of the 15 treatments appeared to reduce mortality in treated trees vs. untreated trees. Diameter growth of surviving trees averaged 3.0 millimeters per year, and the spread rate of the fungus averaged 0.6 meter per year.

Baseline data from 1979 are presented on precipitation, streamflow, occurrence of permafrost, and physical and chemical water quality in a subarctic, tiaga watershed. First- to third-order streams drain catchments embracing permafrost-underlain and permafrost-free landscapes in the undisturbed research watershed. The data are compared to those from a fourth-order stream impacted by placer mining; streams in the research watershed drain into the fourth-order stream slightly beyond the watershed border. These and subsequent baseline data sets will be used to compare natural conditions in...

Incidence of decay fungi was measured in stumps from two thinned western larch (Larix occidentalis Nutt.) stands (9 and 15 years after thinning), one precommercially thinned and one commercially thinned, in northeastern Oregon. Ten species of decay fungi were positively identified from 180 stumps. Two root pathogenic species, Heterobasidion annosum (Fr.) Bref. and Armillaria obscura (Pers.) Herink Roll-Hansen, were found at relatively low frequencies. Most of the decay in the stumps was caused by either Fomitopsis pinicola (Swartz ex Fr.) Karst. or Trichaptum abietinum (Dicks, ex Fr.)...

The 1980 inventory of the forest resources of the Upper Yukon unit was designed to produce inventory estimates of timberland area, volume of timber, and volumes of timber growth and mortality. Timberland area is estimated at 742,000 acres. Cubic-foot volume on all timberland is estimated at 475 million cubic feet. Timber growth and mortality are estimated at -615,000 cubic feet, and 2,238,000 cubic feet, respectively. Detailed tables provide additional breakdowns of inventory results. The inventory was conducted in 1979 and 1980; data compilation was completed in 1984.

Objective information is generally lacking about women and their satisfactions and experiences from participation in outdoor recreation. Data were gathered from campers in three National Forests in Washington and Oregon. Attitudes, preferences, perceptions, and reported activities of men and women campers were compared. Overall, responses showed more similarities than differences; men and women were similar in their usage patterns, activity preferences, perceptions of problems, and attitudes about management practices. Small differences were present, however, and managers need to be aware...

Excellent natural regeneration of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) often occurs under canopies of Pacific madrone (Arbutus menziesii Pursh), but the effects of madrone duff on regeneration are poorly understood. A field experiment was conducted in a thinned Douglas-fir stand in southwestern Oregon to see if madrone duff benefits natural regeneration or reduces the cover of species that compete with Douglas-fir. No significant differences in conifer regeneration and growth or in the cover of competing species occurred among seedbeds of madrone duff, conifer duff, and...

Conversion of commodity-producing rural lands to urban and other built-up uses received considerable attention in the professional literature and in the popular press in the early 1980s (U.S. Department of Agriculture and U.S. Council on Environmental Quality 1981 ; Fischel 1982; Raup 1980; Brown, et al. 1982). Although some have concluded that the forces encouraging the conversion of land will remain and become stronger (e.g., Barron and Dickinson 1975), few empirical studies at regional or national levels have examined determinants of area changes for urban and built-up uses or supported...