Treesearch

An inventory of Orthoptera (grasshoppers and crickets) at the H.J. Andrews Experimental Forest, near Blue River, Oregon, was conducted to determine the species present and ecological relationships. A key for identification and an annotated list are presented. From qualitative assessments of successional habitat relationships, generalized species associations of forest Orthoptera are proposed, and their responses to forest succession are predicted.

Diameter growth of young trees as measured on Douglas-fir stumps of the previous stand was related to height of 5-year-old Douglas-fir seedlings on 16 cable-yarded, broadcast-burned progeny test plantations in southwestern Oregon. The resulting regression can be used to estimate the preharvest potential for seedling height growth on cutover land.

A pilot study was undertaken to determine drying rates for small diameter, unsplit paper birch firewood that was dried: (1) in a conventional top-covered pile; (2) in a simple, temporary solar kiln; and (3) in tree length. Drying rates were the same for firewood piles whether they were in the temporary solar kilns or only covered on top to keep rain or snow from entering the pile. Trees that were severed at the stump and left to dry in tree length form, complete with branches and leaves, however, dried slower than firewood cut to length, stacked, and top-covered or placed in the temporary...

Accurate estimation of the weight of each load of logs is necessary for safe and efficient aerial logging operations. The prediction of green density (lb/ft3) as a function of height is a critical element in the accurate estimation of tree bole and log weights. Two sampling methods, disk and increment core (Bergstrom xylodensimeter), were used to measure the density-moisture complex in wood. The relationship between wood density and height was best described by either quadratic or cubic polynomial functions. Prediction functions for green and dry wood density are presented for old-growth...

The eastern larch beetle (Dendroctonus simplex LeConte) exists throughout the range of tamarack (Larix laricina (Du Roi) K. Koch) in interior Alaska where it has a 1-year life cycle. Beetles overwinter as adults in the bark of the trunk below snowline in infested trees. Tamarack trees that are slow growing because of repeated defoliation by larch bud moth (Zeiraphera sp.) or that inhabit cold wet river bottom sites underlain with permafrost are usually susceptible to attack by eastern larch beetles.

The suitability of western hemlock (Tsuga heterophylla (Raf.) Sarg.) and Sitka spruce (Picea sitchensis (Bong.) Carr.) beach logs in southeast Alaska for lumber, pulp, and energy was determined. Logs were sawn at a cant mill in southeast Alaska and at a dimension mill in northern Washington. Volume and value recovery was compared among samples of live, recent dead, and older dead classes of logs. The live and recent dead samples produced about the same quantity and quality of lumber. The older dead sample produced less volume and lower quality lumber. There were no difficulties in pulping...

Employment in Louisiana's forest products industry, unlike employment in the other 12 Southern States, decreased significantly between 1970 and 1980. Despite this decrease, the value added by the industry increased. The productivity of Louisiana's forest products industry ranked second among the 13 States in the South. In 1980, lumber and wood products accounted for the largest share of the industry's employment, but paper and allied products had a larger share of the earnings. In 1977, paper and allied products had higher productivity than either lumber and wood products or wood furniture.

A survey of natural regeneration 10 years after severe grand fir mortality caused by an outbreak of Douglas-fir tussock moth was conducted in the Wenaha-Tucannon Wilderness in the Blue Mountains of northeastern Oregon. Seedling stocking was only moderate, but seedling density was adequate where present. Grand fir is dominating both preoutbreak and postoutbreak regeneration, but ponderosa pine has increased substantially over preoutbreak levels. The largest seedlings are larch, spruce, and pine. These species have the fastest juvenile growth rate and also were not severely defoliated during...

Timber inventory data for all owners in western Washington and western Oregon were summarized by age classes to provide an estimate of the remaining amount of old growth timber. The data suggest that roughly 30 percent of the timberlands in the Douglas-fir region contain essentially mature timber (stands whose age is in excess of culmination of mean annual increment). Available information on value of old growth is scanty but does suggest that old-growth Douglas-fir is some 56 percent more valuable than second-growth Douglas-fir.

Field tests with control (C), root-dipped (D), jellyrolled (J), and jellyrolled and acclimatized (J + A) bare-root seedlings were conducted at 14 sites in Oregon and Washington in 1984. Nine tests were conducted with ponderosa pine, four with Douglas-fir, and one with lodgepole pine. A separate test with ponderosa pine and Douglas-fir was conducted in Washington in 1983. In the 1984 test, average values of survival for ponderosa pine for the C, D, J, and J + A treatments were 82,86,85, and 87 percent, respectively. The increases in height were 16,18,17, and 15 percent, respectively..Surviva...