Treesearch

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.

Fire history from years 1150 to 1985 was reconstructed by analyzing forest stands in two 1940-hectare areas in the central-western Cascade Range of Oregon. Serving as records for major fire episodes, these stands revealed a highly variable fire regime. The steeper, more dissected, lower elevation Cook-Quentin study area experienced more frequent fires (natural fire rotation = 95 years) that were commonly low to moderate in severity. The Deer study area, with its cooler, moister conditions and gentler topography, had a regime of less frequent (natural fire rotation = 149 years), predominantl...

According to U.S. Forest Service estimates (in press), annual timber harvest volume in the United States will have to increase from the 18 billion cubic feet of 1986 to 27 billion cubic feet by 2040 to satisfy increasing demand (Figure 1). It's doubtful that public forest lands can provide much of this additional timber, primarily because of increasing calls for reduction of timber, harvest on national forests to accommodate other uses of the forests. Large forest industry companies manage their forests for timber production, but they do not own enough land to sustain the projected harvest...

A study was conducted on the productivity and cost of an integrated harvesting and processing system operating in small-diameter timber (western hemlock-type) on the Olympic Peninsula of western Washington. The system uses a new steep-slope fellerbuncher, a clam-bunk grapple-skidder (forwarder), a prototype chain-flail debarker delimber, a chipper, a conveyor system, and a prototype shredder. The study showed that the system harvested and processed trees at a combined-system cost of $7.80 per green ton at a production rate of 455 green tons per day. The delivered product mix was 53 percent...

For five decades after an outbreak of Douglas-fir tussock moth (Orgyia pseudotsugata (McDunnough)), radial growth of defoliated white fir trees (Abies concolor (Gord. & Glend.) Lindl.), was significantly greater than that of nondefoliated host trees nearby. The increased growth probably was due to the thinning effect of tree mortality and increased nutrient availability.

A sampling method was derived whereby budworm density can be estimated by the frequency of occurrence of larvae over a given threshold number instead of by direct counts on branch samples. The model used for converting frequencies to mean densities is appropriate for nonrandom as well as random distributions and, therefore, is applicable to all population densities of budworm. The method is suggested as a possible alternative to the direct counting of larvae in lower crown sampling.

A northeast Washington collection of western larch seeds was stratified for 0,10, 20, 40, and 80 days and incubated at 55, 64, and 73 °F. The germination percentage of filled seeds and speed and uniformity of germination were improved by long stratification, particularly at the lowest incubation temperature. Stratified seeds were also nursery sown in early April and May. Emergence occurred when mean air temperatures were low (48-54 °F), which indicated that long stratification should be beneficial in the nursery. First-year seedling height was closely related to date of emergence.

Projections of Alaska timber products output and timber harvest by owner were developed by using a detailed, trend-based analysis. Historical data for 1965-88 were the basis for projections for 1989-2010. Projections of timber products output for each major product (export logs, sawn wood, and market pulp) were used to compute the derived demand for timber. The assumptions these projections depend on include the level of harvest by Alaska Native corporations, sawn-wood consumption in Japan, and exports of market pulp. Potential harvest from Alaska National Forests (primarily the Tongass...

Natural regeneration was abundant, regardless of grazing and grass seeding treatments,after shelterwood cutting to three overstory densities (27, 73, and 119 square feet of basal area per acre) in mixed conifer stands in the Starkey Experimental Forest and Range in eastern Oregon. After 6 years, the number of tree seedlings ranged from about 3,800 per acre on the low-density plots to 39,000 per acre on the highdensity plots and consisted of about 84 percent grand fir (Abies grandis (Dougl. ex D. Don) Lindl.); 10 percent Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco); and...

Seasonal trends of soil water content in plots of snowbrush (Ceanothus velutinus Dougl.), orchard grass (Dactylis glomerata L), and pinegrass (Calamagrostis rubes- cens Buckl.) and in bare plots were measured on a burned-over forest watershed in north-central Washington. A comparison of soil water contents at depths of 12, 24, 36, and 48 inches indicated that the grasses and snowbrush generally used similar amounts of soil water; although during midsummer, water content at 12 inches in - pinegrass plots was significantly lower than that in snowbrush plots, which indicated greater water use...