Treesearch

The California forest industry as it exists today is the product of dramatic post-World War II changes. Before World War II, the industry consisted almost entirely of sawmills, depending primarily upon redwood and pines for their raw material supply. Responding to the post-War building boom and local population growth, the sawmill industry increased rapidly—from 450 to almost 1,000 mills during 1945-48.

An estimated 160,000 acres support huckleberries in Oregon and Washington, but this area is dwindling as trees and shrubs invade the berry fields. Effective vegetation-control methods and huckleberry management techniques have not been developed. However, such techniques are available for the closely related eastern blueberries, and it may be possible to modify these methods for northwestern conditions. Descriptions and an identification key of the 12 northwestern Vaccinium species are given, as well as a literature review.

The photo intensity, or number of aerial photos per unit of land surface, was examined for six Agricultural Stabilization and Conservation Service photo projects in western Oregon and Washington. On each of the six projects, lands that were primarily nonforest were found to have more photos per unit of area than did the forest lands. Overall, photo intensity averaged 4.1 percent greater on nonforest than forest areas. This suggests a serious source of bias in any forest inventory using photo plots with an equal number of plots per photo. There was no evidence that this difference in photo...

Describes design and use of recording quizboard which records right and wrong answers to questions based on visitor center exhibits. This helps determine how well exhibit messages are reaching visitors. Initial results indicate that taped messages are more effective than those a visitor must read.

Present net worth values earned by investments in precommercial thinning of stagnated ponderosa pine sapling stands are reported for three stocking levels. Thirteen timber management regimes are ranked by their returns from timber only, and 22 regimes are ranked according to their returns from timber and forage, with and without the allowable cut effect.

This paper presents a practical method of estimating the weights of logs before they are yarded. Knowledge of log weights is required to achieve optimum loading of modern yarding equipment. Truckloads of logs are weighed and measured to obtain a local density index (pounds per cubic foot) for a species of logs. The density index is then used to estimate the weights of remaining logs before they are yarded. Estimates are made directly from graphs, tables, or a slide rule.

In laboratory bioassays, coating with endrin reduced consumption of Douglas-fir seed by deer mice. Coating with Arasan did not lower seed consumption, but endrin plus Arasan reduced feeding to levels comparable with endrin alone. Substitution of talc for Arasan produced similar results. Endrin had little effect on seed germination, but addition of Arasan caused a significant reduction. Increasing maounts of latex adhesive used to bind chemicals to the seed decreased the protective effects of endrin treatments.

Germination and early growth on rotten wood and duff under several shade levels were observed for Douglas-fir, Sitka spruce, western hemlock, western redcedar, lodgepole pine, Pacific silver fir, and red alder. Nutrients were more abundant in duff than in rotten wood. Seedlings usually were larger and more abundant on duff-covered rotten logs than on duff-covered mineral soil under dense coastal stands. Duff accumulations were thicker on logs and over rotten wood embedded in the soil than over mineral soil alone. Shade limited root growth more than height growth, and seed bed differences...

This study evaluates the economic desirability of accelerated roadbuilding for access to old-growth timber on a unit of the Umpqua National Forest in Oregon. As of 1966, four accelerated roadbuilding alternatives were found economically inferior to the then current rate of construction. Only in the case of substantial, continuing inflation were projected rates of return on investment for accelerated roadbuilding above G percent compound interest. The inclusion of nontimber benefits and costs, changes in price and cost levels since 1966, and recent improvements in logging technology do not...

Small limbs and small overgrown limbs cause problems when grading saw logs in sugar pine trees. Surface characteristics and lumber recovery information for 426 logs from 64 sugar pine trees were examined. Resulting modifications in the grading specification that allow a grader to ignore small limbs and small limb indicators do not appear to decrease the performance of the grading system.