Treesearch

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.

Trees cut in thinning of Douglas-fir stands were processed into lumber at a profiled cant chipper, a square cant chipper with resaw, and a bandmill. Results are reported in terms of both cubic feet and Scribner long log scale. Included are tables by log input by diameter class for three studies, recovery by lumber grade and dimension item for three studies, and value and recovery by diameter class for the square and profiling canters. Recovery totals for all three studies in both lumber and chips are also reported.

A representative sample of 400 mature, Sitka spruce, sawtimber trees from throughout southeastern Alaska produced 1,009 commercial saw logs that were sawn at Wrangell, Alaska. The distribution of these saw logs by log grade was: 3 percent Select, 7 percent No. 1, 43 percent No. 2, and 47 percent No. 3. The total net log scale (Scribner) was 774,000 board feet. A total of 1,051,000 board feet of lumber were produced from the sample logs, most of which (98 percent) were cants 3 to 8 inches in thickness for export to Japan. The lumber was graded and tallied by two lumber grading systems: (1)...

Stands heavily defoliated in 1936-37 by the Douglas-fir tussock moth, Hemerocampa pseudotsugata McD., at Mammoth Lakes, California, were studied to determine the incidence and extent of decay in top-damaged trees. This was done by dissecting the tops of trees felled during logging. Comparisons were made with white fir in a nearby logged area that was not defoliated during the old outbreak. Few decay organisms were isolated from trees top-killed by Douglas-fir tussock moth. However, old top damage and a condition known as wetwood were common in the infested area. Wetwood was found in 17 of...