Treesearch

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...

Twenty-five series of photographs display different levels of natural forest residue loadings by size classes for areas of like vegetation in the Pacific Northwest. Information with each photo includes measured weights, volumes, and other data on residues, information about live vegetation, and fuel ratings.These photo series provide a fast, easy-to-use way to quantify and describe existing and desired residues.

Sampling studies on western spruce budworm and Modoc budworm disclosed a substantial number of associated insect species at the time larvae were in opening buds. About 20 species occur with sufficient regularity to justify identification by field crews.

Early in 1979 we surveyed forest managers and researchers in a number of northern countries to identify topics in forest management of circumpolar interest. Responses most frequently centered on problems of forest regeneration and related harvesting practices. As a result, an international workshop was held in Fairbanks, Alaska, on 13-15 November 1979, to obtain a perspective of forest regeneration at high latitudes.

Containerized Sitka spruce, [Picea sitchensis (Bong.) Carr.] were inoculated at sowing with pure cultures of either Pisolithus tinctorius (Pers.) Coker & Couch, Laccaria laccata (Scop. ex Fr.) Berk. & Br., Astraeus pteridis (Shear) Feller, Amanita pantherina (D.C. ex Fr.) Schumm., or Cenococcum geophilum Fr. Seedlings were grown in 66-cubic centimeter cells for 6 months in greenhouses at Corvallis, Oregon, and Petersburg, Alaska, and environmental growth chambers at Juneau, Alaska. At Corvallis, Petersburg, and Juneau, respectively, 100, 85, and 100 percent of the seedlings inoculated with...

Of 15 ectomycorrhizal fungi inoculated onto five container-grown conifer species (Larix occidentalis, Pinus contorta, P. ponderosa, Pseudotsuga menziesii, and Tsuga heterophylla), only Laccaria laccata and Cenococcum geophilum consistently formed ectomycorrhizae on all conifer hosts. Percentages of mycorrhizal feeder roots were generally high, ranging from 86 on L. occidentalis to 94.5 percent on T. heterophylla for L. laccata and from 48.1 to 81.8 percent on these respective hosts for C. geophilum. L. laccata significantly colonized more feeder roots than C. geophilum for most conifer...

A report of special interest to fishery biologists, resource managers, hydrologists, and road engineers, this bibliography lists publications pertinent to road crossings of salmon and trout streams. Topics include bridge and culvert installation, design criteria, mechanics, hydraulics, and economics, as well as their biological effects.

Predictive equations for duff reduction and mineral soil exposure by prescribed fire are presented. An explanation is suggested for the dependence of duff combustion on surface fuel combustion. Surface fire duration and fuel moisture estimates of the National Fire-Danger Rating 1,000-hour timelag are the best predictors for reduction in moist duff. Duff layers with less than 30-percent moisture burned independently of surface fires.