Treesearch

Statistics on forest area, total gross and net volumes, and annual net growth and mortality are presented from the 1980-82 timber inventory of the Chatham Area, Tongass National Forest, Alaska. Available timberland area is estimated at 1.4 million acres, net growing stock volume at 7.2 billion cubic feet, and annual net growth and mortality at 35.9 and 54.8 million cubic feet, respectively.

The objective of the study was to develop models that predict lumber and veneer recovery as a function of young-growth log characteristics. Empirical lumber and veneer recovery data for logs cut from more than 300 young-growth Douglas-fir trees were used in model development. Trees were sampled from 15 stands in western Oregon and Washington and represent a wide range of growing conditions, sites, ages, and stocking history. Models were developed that predict (1) the volume recovery of primary (lumber and veneer) and secondary (chips, sawdust, and peeler cores) products, (2) lumber grade...

We radiotracked 9 adult spotted owls (Strix occidentalis) in the southern Oregon Coast Ranges for 6-12 months. Owls selected home ranges that emphasized old growth within the landscape. Minimum convex polygon home ranges of 4 pairs were 1,153-3,945 ha and contained 726-1,062 ha of old growth. The percentages of. the home ranges in old growth were 25-73%. Home-range size expanded significantly (P < 0.05) with decreasing proportions of old growth (r = -0.83). The amount of old growth in the pair home ranges was less variable than was home-range size. Old growth was selected by the owls for...

Counting tracks to obtain an index of abundance for species difficult to capture offers a promise of efficiency and effectiveness when broad surveys of populations are necessary. Sand plots, smoked kymograph paper, and, recently, smoked aluminum plates have been used to record tracks(Raphael et al., 1986; Taylor and Raphael, 1988). Findings of studies of carnivores conducted by using smoked-aluminum track-plates suggest the technique might prove useful for study of arboreal rodents, especially northern flying squirrels, Glaucomys sabrinus (Raphael et al., 1986). Raphael et al. (1986)...

An Aget Cyclone dust collector and peripheral equipment were fieldtested for use in vacuuming large quantities of pollen from 30- to 40-foot trees in a Douglas-fir seed orchard. The Cyclone machine (Model 20SN31P) operated without a vacuum bag or filter device, so no blockage or reduction in vacuum efficiency occurred when large volumes of pollen were collected. Vacuum heads were fabricated out of sheet metal, aluminum or Lexan plastic. The Lexan head was preferred because it was durable and weighed only 12 ounces. Lightweight extension poles and hose permitted workers on the ground to...

We compared the composition and density of the on-site vegetation, seed bank, and seed rain of three geomorphic and successional surfaces along third- and fifth-order streams on the western slope of the central Cascade Range in Oregon.The on-site vegetation generally was dominated by tree species, the seed bank by herb species, and the seed rain by tree and herb species. Seed rain density generally corresponded to the successional stage of the geomorphic surface and frequency of site disturbance, with the youngest and least vegetatively stable geomorphic surfaces having the highest density...

Statistics on forest area, total gross and net volumes, and annual net growth and mortality are presented from the 1984-85 timber inventory of the Ketchikan Area, Tongass National Forest, Alaska. Available timberland area is estimated at 1.5 million acres, net growing stock volume at 8.2 billion cubic feet, and annual net growth and mortality at 24.8 and 65.6 million cubic feet, respectively.

Methods describing how to sample aquatic and semiaquatic amphibians in small streams and headwater habitats in the Pacific Northwest are presented. We developed a technique that samples 10-meter stretches of selected streams, which was adequate to detect presence or absence of amphibian species and provided sample sizes statistically sufficient to compare abundance of individual species among streams. Physical and biological parameters of streams are described as well as ways to collect amphibians effectively. The system can be modified for use in a variety of waterways and for different...

The 1987 inventory of the forest resources of the Kenai Peninsula was designed to assess the impact of the spruce beetle (Dendroctonus rufipennis (Kirby)) on the timberland component of the forest resource. Estimates of timberland area, volumes of timber, and growth and mortality of timber were developed. These estimates of timber resource quantities were also categorized by owner. Total timberland area was estimated at 482 thousand acres. Cubic volume on this timberland was estimated at 1,211,577 thousand cubic feet. Timber growth and mortality were estimated at 9,245 and 7,958 thousand...

A list of publications resulting from research at the Cascade Head Experimental Forest and Scenic Research Area, Siuslaw National Forest, Oregon, from 1934 to 1990 is presented. Over 200 publications are listed, including papers, theses, and reports. An index is provided that cross-references the listings under appropriate keywords.