Treesearch

Identification of opportunities for silvicultural treatment from inventory data is an important objective of Renewable Resources Evaluation in the Pacific Northwest. This paper describes the field plot design and data analysis procedure used by what used to be known as Forest Survey to determine the treatment opportunity associated with each inventory plot in western Oregon and Washington. Information thus obtained should be of considerable interest to planners, legislators, and public administrators.

The construction and existence of forest roads, landings, and decking areas may have significant effects on anadromous fish habitat . Major effects discussed in this paper are increased sedimentation from transportation networks, the hindrance to fish migration of drainage structures, and possible changes in water quality from road stabilization additives. Guidelines and recommendations to decrease or eliminate adverse effects are also given.

Programs for a programable calculator and a desk-top computer are provided for quickly determining yarding cost and comparing the economics of alternative yarding systems. The programs emphasize the importance of the relationship between production rate and machine rate, which is the hourly cost of owning and operating yarding equipment. In addition to generating the data required for analyzing the cost of a yarding operation, the desk top program plots the yarding cost versus production rate curve. Examples and simple step-by-step operating procedures are included.

This report summarizes the climatic and hydrologic measurements taken in the High Ridge evaluation area, a four-watershed complex within the Umatilla barometer watershed of eastern Oregon. The information—measurements of water yield; air, soil, and water temperatures; snow depth and density; and wind—is presented to identify the pretreatment condition and is representative of environmental conditions in similar stands within the Blue Mountain area.

Available information on wetwood is presented. Wetwood is a type of heartwood which has been internally infused with water. Wetwood is responsible for substantial losses of wood, energy and production expenditures in the forest products industry. The need to evaluate these losses and to find ways to eliminate or minimize them is emphasized. Because of increased interest in wetwood, excellent opportunities exist in initiating a comprehensive program of research. Both short and long term studies are included in the program with the short-term studies answering the immediate utilization...

Damage occurring from the disease laminated root rot {Phellinus weirii (Murr.) Gilbertson) on two 10-acre plots in a young (40-year-old) stand of Douglas-fir was studied for 25 years. After 25 years, nearly 5 percent of the basal area was killed by the disease. Stand damage caused by vegetative spread of the fungus was significantly related to previous mortality from the disease and to slower net growth during that period. Nonproductive stand openings caused by the disease occupied over 11 percent of one plot and over 7 percent of the other. Although additional losses can be anticipated...

Management of logging residue is becoming an important part of timber sale planning. This involves controlling the amount of residue remaining on the ground and its distribution by diameter size class. Some residue is beneficial. An interdisciplinary team specified a desired residue level for one clearcutting unit of this trial. For comparison another cutting unit was given a specified residue level approximately 30 percent greater, and another unit 30 percent lower.

A recent Forest Survey inventory of western Oregon has been analyzed to determine the extent of physical opportunities to increase wood production through silvicultural treatment. Results are presented by owner group and by geographic unit.

When a western white pine (Pinus monticola Dougl. ex D. Don) tree dies, it undergoes a series of physical changes. The effects of these changes on product recovery are evaluated. Tabular information and prediction equations provide the tools necessary for using this resource.

Housing demand in Japan is analyzed in terms of new household formations, vacancies, and replacements of housing stock. Total number of starts is projected to stay near current levels or decline, depending on assumptions about replacement demands. This contrasts with rapid growth in number of starts during the 1960's and early 1970's.