Treesearch

Red alder is a species of increasing importance in the Pacific Northwest. Interest in improved volume tables for the species resulted in publication of the 1949 volume tables. More recently, Browne (1962) published cubic-foot-volume tables for red alder in British Columbia, and Hoyer (1966) presented tarif access tables, based on the 1949 tables, for use with the general tarif tables of Turnbull et al. (1963). This paper presents new volume and taper tables for red alder. These form a unified system, permitting computation of cubic- and board-foot volumes for alternative assumed scaling...

The 1966 Washington timber harvest of 6.1 billion board feet was 6.8 percent below the 1965 level. This was the first decline since 1961. In part, the lower harvest in 1966 was due to completion of salvage logging of the 1962 blowdown. The volume of dead timber salvaged in 1966 was only 6 percent of the total, compared with 15 percent in 1965. The live timber harvest actually increased by 3 percent in 1966 to 5.7 billion board feet.

High-vigor seedlings are required for consistently successful reforestation, and mineral nutrition undoubtedly plays a large role in determining seedling vigor. Though no serious mineral deficiencies were known to exist in Northwest forest nurseries, assurance of adequate seedling nutrition would eliminate this factor as a possible cause of plantation failures. Perspective was gained on Douglas-fir nutrition by determining essential element content in foliage of seedlings growing in 10 selected forest areas and 4 nurseries in Oregon and Washington. On the basis of comparative element...

Seasonal growth of tops and roots and concomitant trends in food reserves were observed biweekly on Peudotsuga menzisii (Mirb.) Franco seedlings of two seed sources growing in a Pacific Northwest forest nursery. A general pattern of alternating root, diameter, and shoot growth was found. Rapid root growth did not coincide with rapid shoot elongation, but preceded and followed it. Increased root activity was strongly correlated with lowered reducing sugar concentrations in seedling roots of the faster growing source. Sucrose and raft]nose increased markedly during early winter and were...

The forest resources of this country must be protected from wildfire. Protection does not eliminate fire but does reduce loss from fire. In recent years, more acres have been burned on the unprotected 3 percent of forest land than on the 97 percent under organized fire protection. Protection from fire has saved more than 100 million acres per year. This figure is based on an average burned-area rate of 10 percent for unprotected and 0.2 percent for protected lands.

Aerial color photography has shown promise for evaluating understory vegetation as a forest-fire fuel. Mapping understory vegetation from special aerial photography produced results reasonably similar to those obtained by an independent ground check. Differences in the methods used in the exploratory work prevented strict comparability, but agreement was close enough to suggest that further study would be fruitful. Perfection of photographic and interpretive techniques will improve ability to scout going fires and to map fuels for planning fire control systems. Information on visibility...

This report presents current estimates of annual disease impact on forest productivity of Oregon and Washington. It is concerned exclusively with losses of timber volumes and of potential timber growth in today's forests. Annual loss from disease in this region is estimated at 3,133 million board feet or 403 million cubic feet. This is about 13 percent of the total annual growth including the mean periodic growth ~ of seedlings and saplings.' Of this loss, 162 million cubic feet is potential growth prevented by disease, 129 million is mortality, and 112 million is cull. West of the Cascade...

The 1966 Oregon timber harvest totaled 8.9 billion board feet, 5 percent less than the harvest in 1965. During 1966, the total public timber harvest declined 10 percent to 4.8 billion board feet. The uncut volume of public timber under contract at the end of 1966 was 7.6 billion board feet, up 1.3 billion board feet from 1965's year end total. National Forest timber cut during 1966 declined 512 million board feet and the cut from State lands declined 70 million board feet, down 14 percent and 27 percent, respectively. The Bureau of Land Management's log production remained virtually unchanged.

A study was established in 1952 near Boundary Creek in the Panther Creek area on the Wind River experimental Forest near Carson, Wash. Site index averages 140, and aspect is westerly at elevations around 2,000 to 2,400 feet. Two minor drainages traverse the study area from east to west, creating various northwesterly and southwesterly aspects. The almost pure Douglas-fir stand was fairly well stocked before thinning, averaging 86 percent of normal basal area, although individual plot percentages ranged from 62 to 100.

Tetramethylenedisulphotetramine (tetramine) is an extremely toxic chemicaI (Hagen 1950).' Shortly after its discovery in Germany (Hecht and Henecka 1949L it was introduced in the United States and found useful as an experimental seed protectant in reforestation by direct seeding (Spencer 1954). The first indication of tetramine's systemic characteristics was that seedlings grown from tetramine-treated seed were toxic to rodents during the first month after germination ( Spencer 1954). This observation led to (1) bioassay studies to determine translocation of the chemical and (2) pen and...