Treesearch

Relative density is a measure of tree crowding compared to a reference level such as normal density. This stand attribute, when compared to management standards, indicates adequacy of stocking. The Pacific Coast Forest Survey Unit assesses the relative density of each stand sampled by summing the individual density contributions of each tree tallied, thus quantifying the effects of mixed species, mixed age, and irregular spacing on total stand density. Each tree's contribution reflects its stage of development, species, and social position. Plot clusters are designed to permit assessment...

This report presents an overview of the technology of converting wood to energy and the availability of wood. The first section describes fuel values and significant processes used to generate various energy products from wood. Physical, technical, and economic availability of the wood resource is discussed in the second section. The paper concludes with an outline of some critical problems in handling wood and some socioeconomic factors that impact the production of energy from wood. An extensive bibliography covers topics discussed in the paper.

Vegetative propagation trials were conducted with stem, root, and rhizome cuttings of Alnus, Arctostaphylos, Ledum, Populus, Salix, Shepherdia, Vaccinium, and Viburnum. With the exception of Alnus incana and Shepherdia canadensis, stem cuttings of all species produced some roots. Softwood stem cuttings of Salix bebbiana and Viburnum edule rooted much better than hardwood cuttings of the same species; hardwood and softwood stem cuttings of other species were about equal in performance. Rooting media, wounding, and hormone treatments did not affect rooting of stem cuttings in the majority of...

This report presents statistics from a 1976 timber resource inventory of 10 counties in northwest Oregon: Clackamas, Clatsop, Columbia, Hood River, Marion, Multnomah, Polk, Tillamook, Washington, and Yamhill. Tables presented are of forest area, timber volume, growth, mortality, and harvest.

The first intensive forest inventory of the Kuskokwim River flood plains and adjacent uplands was conducted in 1967. A commercial forest area of 252.5 thousand acres (102.2 thousand hectares) was identified with a growing-stock volume of 343.0 million cubic feet (9.7 million cubic meters). A noncommercial stratum was also examined that had substantial standing volume but did not qualify as commercial forest land. This stratum contained 70.4 thousand acres (28.5 thousand hectares) with a volume of 65.9 million cubic feet (1.9 million cubic meters).

Habitat requirements of anadromous and some resident salmonid fishes have been described for various life stages, including upstream migration of adults, spawning, incubation, and juvenile rearing. Factors important in the migration of adults are water temperature, minimum water depth, maximum water velocity, turbidity, dissolved oxygen, and barriers. Habitat requirements for successful spawning are suitable water temperature, water depth, water velocity, and substrate composition. Cover—riparian vegetation, undercut banks, and so on—is needed to protect salmonids waiting to spawn and may...

The Wickersham Dome fire occurred in late June 1971 and burned over 6 300 hectares of predominantly black spruce forest land. Shortly after the fire was controlled, studies of the effects of the fire on various components of the biotic community were undertaken. Results reported here are mainly for the first 3 years after the fire.

Documentation of three model versions: the Douglas-fir tussock moth population-branch model on (1) daily temporal resolution, (2) instart temporal resolution, and (3) the Douglas-fir tussock moth stand-outbreak model; the hierarchical framework and the conceptual paradigm used are described. The coupling of the model with a normal-stand model is discussed. The modeling convention and algorithm used are also discussed.

Emphasis on environmental and esthetic quality in timber harvesting has brought about increased use of complex boundaries of cutting units and a consequent need for a rapid and accurate method of determining the average yarding distance and area of these units. These values, needed for evaluation of road and landing locations in planning timber harvests, are easily and accurately determined by a desk-top computer and digitizer system programed in BASIC language. This paper presents two programs designed for that purpose.

This report is a compilation of autecological information previously scattered about in several hundred publications. It includes a comparison of the tolerances, traits, and attributes of native northwestern tree species. The species are ranked with respect to 69 environmental factors, phenotypic characteristics, and physical parameters. These rankings, with the literature references from which they were derived, should be useful aids to species selection, management, and research in the Pacific Northwest.