Treesearch

Thirty grand fir (Abies grandis (Dougl. ex D. Don) Lindl.) trees were artificially inoculated with the fungal symbiont, Trichosporium symbioticum Wright, to simulate attack by the fir engraver beetle, Scolytus ventralis LeConte. Fifteen months after treatment, secondary resin production, necrotic lesion formation, and percentage of wounds with T. symbioticum were determined in relation to tree vigor and inoculation density. Resin production was significantly greater in high-vigor trees but was not affected by inoculation density or degree of fungal colonization. Lesions from inoculated...

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.

Bats represent the second most diverse group of mammals inhabiting the western slopes of the Cascade Range in southern Washington and the Oregon Coast Range. Bat populations may well be sensitive to changes in forest age, structure, or distribution, but their nocturnal habits and high mobility render the study of the habitat requirements of bats problematical. Unlike most other groups of vertebrates, bats are difficult to either observe or capture, and survey methods are poorly known. This paper reviews techniques for surveying bat populations and presents the methodology used in the...

A stochastic model useful in simulating daily maximum and minimum temperature and precipitation developed by Bruhn and others has been adapted for use in the western spruce budworm modeling system. This document describes how to use the weather model and illustrates some aspects of its behavior.

Fishery managers are currently spending millions of dollars per year on habitat enhancement for anadromous salmonids but often do not have the tools needed to ensure success. An analysis of factors limiting production of salmonids in streams must be completed before any habitat-enhancement program is begun. This paper outlines the first formal procedure for identifying physical habitats limiting production of coho salmon.

The timber resource inventory model (TRIM) has been adapted to run on person al computers. The personal computer version of TRIM (PC-TRIM) is more widely used than its mainframe parent. Errors that existed in previous versions of TRIM have been corrected. Information is presented to help users with program input and output management in the DOS environment, to understand the differences between PC-TRIM and mainframe TRIM, and to avoid common mistakes that can lead to program-generated errors.

Two consecutive timberland inventories collected from permanent plots in the natural pine type in North Carolina were used to evaluate the timber resource inventory model (TRIM). This study compares model predictions with field measurements and examines the effect of inventory data aggregation on the accuracy of projections. Projections were repeated for two geographic areas with two data aggregation schemes. The sensitivity of the model to harvest was tested with historical and adjusted values. For each simulation, the TRIM growth projection mechanism was tested with two types of yield...

Growth, winter injury, and mortality were evaluated for 12-year-old trees of 11 subarctic lodgepole pine provenances and a jack pine provenance at Fairbanks, Alaska. Provenances from northeast British Columbia grew more than 0.003 cubic meter of wood per tree annually from 9 to 12 years after outplanting. The species sustained snow damage and winter injury, however, and could be at high risk in long-term management on severe sites in Alaska. Provenance x site interactions were not significant for mortality, tree height, and volume after the same stock grew for 10 seasons at Fairbanks and...

A sample of 130 incense-cedar (Libocedrus decurrens Torr.) trees was selected from the Eldorado National Forest in California. The trees were felled and bucked into 403 woods-length logs and processed through a sawmill cutting Shop and Common grades of lumber. Recovery estimates are shown for woods-length logs based on Scribner board-foot scale and cubic-foot scale. Analysis showed that board-foot recovery ranged from 169 percent for 6-inch logs to 103 percent for 34-inch logs. Cubic-volume recovery of rough green lumber increased from 50 percent to 62 percent for the same range of...

The forest products industry is one of Mississippi's basic industries, and in 1980, it accounted for about one of six basic jobs. Mississippi was one of the majority of Southern States in which the forest products industry improved its competitive position during the 1970's. Between 1972 and 1977, growth in productivity of Mississippi's forest products industry was exceeded by only three other States in the South.