Treesearch

Forest land generally produces considerable woody material other than that which is harvested as timber, needed for recycling of nutrients to the soil, or for sheltering wildlife and young forest seedlings. Excess forest residues, both living and dead, are often subject to treatment to reduce fire hazard, to eliminate obstruction to use and protection of the forest, and to remove unsightly accumulations of residue remaining after logging, road construction, or land clearing, or from thinning and pruning. The effects of these residues and of their treatment are frequently important,...

Natural soil-mass-movements on forested slopes in the Western United States can be divided into two major groups of closely related landslide types. These include, in order of decreasing importance and regional frequency of occurrence: (1) debris slides, debris avalanches, debris flows, and debris torrents; and (2) creep, slumps, and earth flows. Each type requires the presence of steep slopes, frequently in excess of the angle of soil stability. All characteristically occur under high soil moisture conditions and usually develop or are accelerated during periods of abnormally high...

Three months, April and August 1971 and August 1972, were spent studying the vertebrate fauna of Cascade Head Experimental Forest. The resulting annotated checklist includes 9 amphibians, 2 reptiles, 35 birds, and 40 mammals. A standardized animal habitat classification is presented in an effort to correlate the vertebrates in some meaningful way to their environment.

Public concern over environmental pollution requires increasingly sophisticated procedures when herbicides are used in silviculture. Many specialized aerial application systems and spray additives have been developed to reduce drift of herbicidal sprays. This publication provides forest-land managers with a brief description of these aerial spray systems and additives. Personnel and supervision to insure proper use of equipment and additives are also discussed.

Records of 21 stations were analyzed for the occurrence, persistence, and related visibility resulting from summertime wildfire smoke and haze in interior Alaska. Maximum probability of smoke occurrence for any station and month was 8.7 percent in July for Bettles. Seasonal occurrence of smoke was greatest for Tanana—3.3 percent. Smoke persistence and visibility reduction were not found to the extent previously assumed.

Timber resource statistics to January 1, 1973, for the State of Washington show total land area, commercial timberland area, and growing stock and sawtimber inventory volumes by county and owner group. Growth and removals are shown by Forest Survey inventory unit for 1972. Each National Forest is updated to January 1, 1973.

Timber resource statistics as of January 1, 1973, for the State of Oregon show total land area, commercial timberland area, and growing stock and sawtimber inventory volumes by county and owner group. Growth and removals are shown by Forest Survey inventory unit for 1972. Each National Forest is updated to January 1, 1973, as well as each Bureau of Land Management District in western Oregon.

Existing records show that five wildfires burned more than 1,600 hectares of tundra on Alaska's Arctic Slope. Environmental conditions suitable for lightning, ignition, and burning occur more often than previously recognized at this northern latitude.

The findings of the latest inventory of the timber resources of central Washington indicate there are 50.9 billion board feet of sawtimber on 4,370,000 acres of commercial forest land. Land owned or administered by public agencies accounts for 73 percent of the area and 84 percent of the sawtimber volume; farmer and miscellaneous private ownerships account for 17 percent of the area but only 9 percent of the volume; and the forest industry sector is smallest, with only 10 percent of the area and 7 percent of the volume.

Major vegetational units of Oregon and Washington and their environmental relationships are described and illustrated. After an initial consideration of the vegetation components in the two States, major geographic areas and vegetation zones are detailed. Descriptions of each vegetation zone include composition and succession, as well as discussion of variations associated with environmental gradients. Three chapters treat the forested zones found in the two States. Major emphasis is on the distinctive mesic temperate forests found in western Washington and northwestern Oregon. The...