Treesearch

The 1974 Oregon timber harvest of 8.36 billion board feet was 9.2 percent, or 0.84 billion board feet, below the 1973 harvest. (The data for 1973 were adjusted to reflect the change in reporting of harvest on Bureau of Land Management lands; see footnote 3 of table.) While the harvest in western Oregon decreased 14.7 percent, eastern Oregon cut increased 11.5 percent.

The hydrology of small forest streams in western Oregon varies by time and space in terms of both streamflow and channel hydraulics. Overland flow rarely occurs on undisturbed soils. Instead, water is transmitted rapidly through soils to stream channels by displacement of stored soil water. Drainage networks expand and contract according to the interaction between precipitation characteristics and soil's capability to store and transmit water. Drainage networks are more extensive in winter than in summer. Streamflow may he 1,000 to 5,000 times greater during winter storms than during...

This publication provides silviculturists and managers of utility rights-of-way with a description and evaluation of available helicopter spray application equipment. Modified conventional equipment will reduce drift of sprays in normal carriers and apply various high-viscosity sprays. Specialized spray systems have found limited use in forestry; they are more commonly used on utility rights-of-way. Most of the available spray systems or spray adjuvants reduce but do not completely eliminate drift. Maximum drift reduction with present equipment and adjuvants is obtained with the Microfoil...

This study notes the increasing concern over logging residue in forest land management and describes the various administrative and technological means for accomplishing reductions of logging residue. Alternative sales arrangements can include such things as reduction of stumpage charges for low quality logs or required yarding of unutilized material to the landing or to some stockpiling or disposal point. Improvements in materials handling can include use of logging systems that create less breakage or that can handle small pieces more efficiently. Specialized chip mills and increased...

An annotated bibliography supplementing bibliographies by Tarrant for 1956 through 1963 and by Klock for 1969 through 1974.

Climatic and hydrologic measurements were made on three watersheds, each containing approximately 2 square miles (5.18 km2) of drainage area, for 9 years under natural forested conditions. This paper describes the watersheds with respect to soils and geology, morphology, vegetation, precipitation and other climatic parameters, and flow, sediment, temperature, and chemistry of streams during this period.

This bibliography provides descriptions of material published on recreation and scenic resources in Alaska. Included are publications on research and supporting material in the form of studies and reports, proposals, plans, historical and cultural references, bibliographic documents, and popular books and articles describing the resources of Alaska and issues relating to their management and use. It contains author and keyword indexes.

This paper is basically an alpha code and name listing of forest and rangeland grasses, sedges, rushes, forbs, shrubs, and trees of Oregon, Washington, and Idaho. The code expedites recording of vegetation inventory data and is especially useful to those processing their data by contemporary computer systems. Editorial and secretarial personnel will find the name and authorship lists to be handy desk references.

Six series of photographs display forest residue loading levels, by size classes, for areas of timber type and cutting practice. Information with each photo includes measured weights, volumes and other residue data, information about the timber stand and harvest or thinning actions and fuel ratings. These photo series provide fast and easy-to-use means for quantifying and describing existing and expected residues.

Forest management activities, including roadbuilding, clearcut logging, and broadcast burning, can change certain portions of the forest hydrologic cycle. Watershed studies and other hydrologic research in the Coast and western Cascade Ranges of Oregon have shown that these changes may increase annual water yield up to 62 centimeters, double minimum flows in summer, and increase fall peak flows up to 200 percent and small winter peak flows up to 45 percent in small watersheds. Changes in streamflow resulting from clearcut logging had little effect on either onsite damage to stream channels...