Treesearch

Annual water yields and size of peak flows were not changed, but low flows decreased significantly after patch logging in two small watersheds.

Natural events affecting vegetative cover and the hydrology and stability of a stream and its parent watershed are key factors influencing the quality of anadromous fish habitat. High intensity storms, drought, soil mass movement, and fire have the greatest impacts. Wind, stream icing, and the influence of insects and disease are important locally.

Logging costs were developed in a study of residue removal to specified levels in each of three size classes: 1/4 to 3, 3.1 to 9, and over 9 inches in diameter. These levels were determined by an interdisciplinary team during initial sale planning and represented levels that would be desired to attain without slash burning. Cable yarding was specified. This trial was conducted on the Wind River Experimental Forest near Carson, Washington.

This guide can be used in evaluating the height growth potential of planted seedlings and advance reproduction. An equation and tables are presented, with an example of their use.

Radial growth reduction related to amount of tree defoliation was studied following a severe tussock moth outbreak. Growth sharply declined the year after defoliation began, and amount of decline was proportional to percent defoliation. Growth recovery began the year after defoliation ceased and radial increment had returned to pre-outbreak levels 5 years after defoliation.

Twelve different nitrogen (N) fertilizer treatments were tested on potted western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings. Fertilizers affected soil N and pH, and growth and foliar chemical composition of seedlings. Urea plus N-Serve and sulfur-coated urea appear more promising for promoting growth than other fertilizers tested. Results, however, do not explain reported variability in response of hemlock stands to N fertilization.

Reviews U.S. foreign and domestic markets for softwood construction materials, giving special consideration to trade patterns among Japan, Canada, and the United States. For alternative assumptions about market responses to a ban of U.S. softwood log exports, displays impacts on selected measures of U.S. softwood stumpage, lumber, and plywood markets.

Effects of plastic mesh cages designed to protect Douglas-fir seedlings from animals were evaluated in western Oregon. In two tests over 5-year periods, caging increased survival by 0 and 13 percent and increased height growth by 0.8 and 1.2 feet compared with uncaged trees. Benefits from caging might have been greater if damage had been more prevalent during the tests.

The flow of funds from commercial banks in western Oregon may indicate how a timber shortfall will affect community stability. Results suggest the inappropriateness of a single public forest management policy.

The 1980 Resources Planning Act Timber Assessment and Program prepared in response to provisions of the Forest and Rangeland Renewable Resources Planning Act of 1974 (as amended by the National Forest Management Act of 1976) contains regional projections of average stumpage prices that are potentially useful in national forest planning. Their usefulness can be improved if the average prices are separated by species. This separation process depends on assumptions about changes in relative importance (as measured by volume) of the various species. Further refinement of stumpage prices to the...