Treesearch

Management guidelines for economically efficient early stand treatments were developed by identifying treatments that would maximize financial returns over the rotation for coast Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) in southwest Oregon. Short rotations and low stand densities (trees per acre) gave the highest financial returns in all cases. Usually precommercially thinning to a low stand density was more advantageous than planting at low density. Fertilization as soon as possible was always profitable. The financially optimal management regimes for low-cost and...

A total of 5,597 photo points was systematically located on 1:60,000-scale high altitude photographs of the Kenai Peninsula, Alaska; photo interpretation was used to classify the vegetation at each grid position. Of the total grid points, 12.3 percent were classified as timberland; 129 photo points within the timberland class were randomly selected for field survey. The number of sample points visited in each of three forest cover types (conifer, broadleaf, and mixed conifer-broadleaf) was proportional to the frequency of the cover type in the photo sample. Two-way indicator species...

A progeny test of 170 open-pollinated families from second-generation plus trees of Pinus radiata was established on four sites in New Zealand in 1981. Two test sites were on volcanic purnice soils in the Central North Island region and two were on phosphate-retentive clay soils in the Northland region. Assessments of volume growth, stem straightness, mal-format on, and branch habit were made at age 4.5 years.Family x site interaction variance components for stem volume were highly significant (e = .01) between pumice and clay sites, and also between the clay sites of differing fertilities,...

Detailed airborne measure ments of smoke plumes from seven prescribed burns of forest biomass residues leftover from timber harvests in Washington and Oregon are described. Measurements of particle size distributions in the plumes at 3.3 km downwind of the burns showed a prominent peak in the mass concentration for particles 0.25-0.30 µm in diameter. The total mass of particles in the plume was dominated, however, by supermicron-sized particles. The particle number distributions were dominated by large numbers of Aitken nuclei (median number diameter 0.15 µm).Based on numerous airborne...

Bird calls and songs vary regionally, and some birds emit a variety of sounds. Existing guides are inadequate for training observers to do detailed surveys of bird communities, because more than 90 percent of birds detected are identified by the sounds they emit. This guide summarizes existing guides and adds the observations of the compilers and other technicians who participated in extensive surveys. Four-letter codes for species names, taken from the American Ornithologists' Union, are included. A checklist by region (southern Washington, Oregon Cascade Range, Oregon Coast Ranges, and...

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.

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.

This report notes the changes in timberland area and in timberland ownership that took place in western Oregon between 1961 and 1986. The data for the report were based on observations and measurements taken during three successive forest inventories of non-Federal lands in western Oregon. Estimates of change were based on repeat measurements of 1,465 permanent plots but older classification were revised to meet current definitions and standards.

By 2000, prices are expected to rise significantly for medium-grade logs and modestly for low-grade logs. World economic cycles may obscure, however, the upward price trends. Exports from the United States of medium grades are expected to remain stable, while volumes of lower grades are projected to remain level through 1995 and then decline because of competition.

Height and diameter growth of Pacific silver fir (Abies amabilis Dougl. ex Forbes) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) site trees, as well as overall stand structure on 0.15-acre plots, were analyzed in mixed stands 43 to 57 years old in breast height age at six locations in western Washington. These mixed stands have produced volumes of 9,160 to 20,200 cubic feet per acre. Early height and diameter growth of hemlock site trees was greater than that of silver fir. After 30 to 45 years of growth, the predicted site index of silver fir was 1 to 2 feet greater than that of...