Treesearch

The current fire behavior system, when properly adjusted, accurately predicts forward rate of spread and flame length of wildfires in black spruce (Picea mariana (Mill.) B.S.P.) forests in Alaska. After fire behavior was observed and quantified, adjustment factors were calculated and assigned to the selected fuel models to correct the outputs to more nearly coincide with observed values. Spotting distance models predict maximum spotting distances if some corrections and assumptions are made. Field-tested procedures are described.

Multiple regression analyses are used to relate environmental factors and vegetation to postharvest forest regeneration in the Applegate area of southwestern Oregon. Optimal environments for regeneration were identified by aspect, slope, elevation, rock cover, and vegetation.

Most cable logging operations use a spar held in place near the landing by a system of guylines and anchors. Safety and economic considerations require that overloads be avoided and that the spar remain stable. This paper presents a procedure and a computer program to estimate the guyline and anchor loads on a particular system configuration by a specific set of operating line tension loads. A brief description of the analytical model used for the computations is included. There are instructions on the use of the computer program, a description of the necessary outputs, and a program...

The literature and many published documents on rehabilitating and enhancing stream habitat for salmonid fishes are reviewed. The historical development and conceptual basis for habitat management are considered, followed by a review of successful and unsuccessful techniques for manipulation of spawning, rearing, and riparian habitat. Insufficient attention to evaluation of past work has slowed the development of habitat management for anadromous salmonids in the West. Recent developments, including improved design of structures to accomodate variable streamflow, show promise of permitting...

Similar estimates of the tree and stand growth 19 years after thinning a 100-year-old stand of Douglas-fir were derived from stem-analysis and standard volume-table, plot-compilation procedures.

This report for the 2.9-million-acre Kantishna block is the second of four on the 14-million-acre Tanana Valley inventory unit. Comments are made on general landform, timber use, recreational potential, agricultural developments, forest defect, regeneration, and inventory methodology. Tables are provided for commercial forest land and for operable noncommercial forest land. Estimates for commercial forest land total 424,200 acres with 367,300,000 net cubic feet of growing stock volume. Estimates for the operable noncommercial class total 41,500 acres with 42,600,000 net cubic feet of...

Lumber recovery data from 1,106 logs from 341 young-growth white fir (Abies concolor (Gord. & Glend.) Lindl. ex Hildebr.) and red fir (A. magnifica A. Murr) trees are presented. All logs were processed through a quad-band headsaw. Nominal 2x4's and 2x6's made up over 93 percent of the lumber volume; nearly 70 percent was No. 2 (Standard) and better. Average overrun was 54 percent of net log scale. Cubic recovery of lumber in roughgreen and surfaced-dry conditions averaged, respectively, 53 and 42 percent of gross cubic log volume. The lumber recovery factor averaged 7.5 board feet per...

Diameter, height, and volume growth and yield are given for plots thinned to 1000, 500, 250, 125, and 62 trees per acre in a 40- to 70-year-old stand of suppressed ponderosa pine (Pinus ponderosa Dougl. ex Laws.) saplings in central Oregon. Trees averaged about 1-inch in diameter and 8 feet in height at the time of thinning. Considerations for choosing tree spacing for precommercial thinning in this type of stand are discussed.

Removal of dissolved organic carbon (DOC) from water resulting from adsorption and microbial uptake was examined to determine the importance of biotic and abiotic pathways. Physical–chemical adsorption to components of the stream sediment or water and biotic assimilation associated with the microbial population was determined in recirculating chambers utilizing leachate from alder (Alnus rubra). Adsorptive mechanisms were further separated into interactions involving (1) specific clay minerals, (2) amorphous solid phases of hydrous aluminum and iron oxides, and (3) fine particulate organic...

A survey of cutover timberland in the Butte Falls and Dead Indian areas showed that most partial cuts were moderately or well-stocked with natural regeneration. Clearcuts in the Butte Falls area were also well stocked, primarily with planted ponderosa pine; but many in the Dead Indian area were not. Advance regeneration was an important stocking component in partial cuts. Stocking varied by forest type, species, and drainage and correlated with an array of environmental variables. Regression equations describe present stocking patterns, and others predict future stocking based on variables...