. Economics of thinning stagnated Ponderosa pine sapling stands in the pine-grass areas of central Washington. Ponderosa pine Washington (State) Thinning. The influence of the allowable cut effect on economic returns from invest- ments in thinning these overstocked stands is apparent in figure 8 and in columns 5 and 6 of table 3. Clearcuts at age 77 years are always low-ranked regimes when the allowable cut effect is considered. Note that a pre- commercial thinning to 250 trees per acre followed by a clearcut in 30 years (age 77 years) produces a smaller return when the allowable cut effect is
. Economics of thinning stagnated Ponderosa pine sapling stands in the pine-grass areas of central Washington. Ponderosa pine Washington (State) Thinning. The influence of the allowable cut effect on economic returns from invest- ments in thinning these overstocked stands is apparent in figure 8 and in columns 5 and 6 of table 3. Clearcuts at age 77 years are always low-ranked regimes when the allowable cut effect is considered. Note that a pre- commercial thinning to 250 trees per acre followed by a clearcut in 30 years (age 77 years) produces a smaller return when the allowable cut effect is not included than clearcutting the stagnated control stand at either age 77 or 97 years (see column 5 in tables 2 and 3). This occurs because the discounted value of the increased growth, in the 30 years follow- ing the precommercial thinning, is less than the cost of the precommercial thin- ning which is incurred immediately and cannot be discounted. 120 100 » 80 o "D O c c 03 c/3 03 SHELTERWOOD at age 97; CLEARCUT at age 97 years overwood removal at age 102 60 40 20 0 -20 -40 — Timber with ACE and forage >— Timber and forage ... Timber only. 250 125 62 250 125 62 Number of trees per acre after precommercial thinning Figure 8.—Present net worth based on a 5-percent discount rate for a shelterwood regime and a clearcut regime for timber, timber and forage, and forage and timber with the allowable cut effect at three stocking levels. 14. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sassaman, Robert W; Barrett, James W. (James Willis), 1922-; Smith, Justin G. (Justin Gardner), 1911-. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture, Forest Service
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