. Yields with and without repeated commercial thinnings in a high-site-quality Douglas-fir stand. Douglas fir Thinning; Forest thinning. < —i < < CD < Z u. O I- Z ui O cc 120 110 100 90 80 70 60 50 40 30 20 10 0 56 mortality. 87 percent of unthinned 58 60 _l_ 62 64 66 AGE (YEARS) 68 70 72 74 Figure basal area growth and yield of thinned and unthinned stands. Table 3.—Mortality per acre in thinned and unthinned stands, trees inches and larger in — Period Number of years in period?./ Number of stems Mean Basal area Total volume Inches Unthinned stands Sq
. Yields with and without repeated commercial thinnings in a high-site-quality Douglas-fir stand. Douglas fir Thinning; Forest thinning. < —i < < CD < Z u. O I- Z ui O cc 120 110 100 90 80 70 60 50 40 30 20 10 0 56 mortality. 87 percent of unthinned 58 60 _l_ 62 64 66 AGE (YEARS) 68 70 72 74 Figure basal area growth and yield of thinned and unthinned stands. Table 3.—Mortality per acre in thinned and unthinned stands, trees inches and larger in — Period Number of years in period?./ Number of stems Mean Basal area Total volume Inches Unthinned stands Square feet ~!ubic feet 1 8 6 270 2 13 10 420 3 6 6 330 Total 27 22 1,020 Thinned stands 1 9 7 300 2 4 2 80 3 3 3 110 Total 17 12 490 — Apparent slight discrepancies are due to rounding of numbers. 2/ _ . n Fractional number of years represent a combination of (1) measurement made during the growing season and (2) averaging of subareas having measurement periods of different lengths. 6. 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 Reukema, Donald L. cn; Pienaar, Leon V. (Leon Visser), 1936-; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture, Forest Service
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