Treesearch

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...

Employment and earnings in Oklahoma's forest products industry, like those of most Southern States, grew significantly between 1970 and 1980. In fact, Oklahoma's share of the Nation's forest products employment and earnings increased during this period. In 1980, lumber and wood products accounted for the largest share of the industry's employment, but paper and allied products had a larger share of the earnings. In 1977, pulp and allied products had higher productivity than either lumber and wood products or wood furniture.

This comprehensive catalog of viral diseases of three large groups of arthropods updates the previous surveys of the world's literature published by Hughes in 1957, by Martignoni and Langston in 1960, and by Martignoni and Iwai in 1975. This computer-based catalog lists over 1,100 species of insects, mites, and ticks, each reported to have one or more of 22 viral diseases or disease groups, for a total of about 1,690 host-virus records. The catalog consists of two lists. In the first one, the hosts are listed in taxonomic sequence (order, family, genus, species). Families appear alphabetica...

A survey of timberland cut over from 1956 to 1971 in the Applegate, Evans, and Galice-Glendale areas of southwestern Oregon showed that both partial cuts and clearcuts were well stocked with a combination of regeneration that started before and after harvest cutting. Advance regeneration was a major stocking component in partial cuts. Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) was the predominant species of advance and subsequent regeneration in both partial cuts and clearcuts. Stocking differed significantly by forest type, soil series, soil origin, soil depth, and stream drainage...

Ratios are presented for estimating volume and characteristics of logging residue in California. The ratios relate cubic-foot volume of residue to thousand board feet of timber harvested and to acres harvested. Tables show gross and net volume of residue, with and without bark, by diameter and length classes, by number of pieces per acre, by softwoods and hardwoods, by percent soundness, and by degree of slope and distance to roads.