Treesearch

Western juniper (Juniperus occidentalis subsp. occidentalis) is an important invader of range lands in central and eastern Oregon. Many people have asked questions about its control, effect on range productivity, and its benefits. The papers in this proceedings resulted from a conference held in Bend, Oregon, January 1977, to summarize our knowledge of western juniper and to evaluate research needs.

In 1975, the Washington timber harvest declined for the 2d year to 6.2 billion board feet, 10 percent below 1974, and the lowest level in 8 years. The decrease, which occurred on almost all ownerships, amounted to 561 million board feet in western Washington and 130 million board feet in eastern Washington.

What must be the world's most magnificent pool of forest genes has timbered our Pacific slopes. Why else do the tallest firs, pines, spruces, hemlocks, redwoods, and larches all rise along the Pacific Coast of North America? Does their hugeness simply thrust up from our deep soils and mild, rainy climate? From a vantage point of three decades in forest research, I believe the key to this wealth of timber is more than a matter of soil and moisture. Taken together, the genes of our 22 commercial western conifers seem to me to constitute our vital basic resource. And unless we recognize the...

Bush penstemon (Penstemon fruticosus (Pursh) Greene), an attractive ground cover on east Cascade slopes, appears to survive under low fertility, xeric conditions. These plant characteristics are desirable for revegetating severely disturbed areas. Seedling response to fertilization was tested to find if growth rates could be increased to provide quicker ground cover with new plantings. Bush penstemon does respond to nitrogen and phosphorus fertilization under greenhouse conditions. It appears that, with adequate soil moisture, 50- to 100-ppm nitrogen is sufficient for nearly maximum growth...

Large amounts of logging residue are generated each year in timber harvest operations in old-growth forests in the Douglas-fir region of western Washington and western Oregon. Economic availability of each piece, however, depends on its size, condition, location, and on the existence of markets, with an adequate price to cover costs. An estimated 185.8 million cubic feet of logging residue were found to have a positive conversion value in 1970. Lack of utilization is considered due to numerous technical inefficiencies and market imperfections such as low volumes per acre, lack of local...

This report summarizes a timber resource inventory in Lassen, Modoc, Siskiyou, Shasta, and Trinity Counties, California. Included are detailed tables of forest area, timber volume, growth, mortality, and removals and a discussion of the current timber resource and timber industry situation.

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

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...