. Growth of ponderosa pine poles thinned to different stocking levels in central Oregon. Ponderosa pine Oregon; Ponderosa pine Oregon Spacing. Table 1—Average stand characteristics per acre for each growing-stock level in an even-aged ponderosa pine stand on an above-average site in central Oregon Volume Growing-stock Basal level Total V Height area Total 2/ Merchantable 3/ Number Square of Square feet/acre trees Inches Feet feet/acre Cubic feet Board feet TREES CUT IN INITIAL THINNING 30 925 50 4,482 60 1,032 42 3,546 80 915 42 2,731 100 1,015 39
. Growth of ponderosa pine poles thinned to different stocking levels in central Oregon. Ponderosa pine Oregon; Ponderosa pine Oregon Spacing. Table 1—Average stand characteristics per acre for each growing-stock level in an even-aged ponderosa pine stand on an above-average site in central Oregon Volume Growing-stock Basal level Total V Height area Total 2/ Merchantable 3/ Number Square of Square feet/acre trees Inches Feet feet/acre Cubic feet Board feet TREES CUT IN INITIAL THINNING 30 925 50 4,482 60 1,032 42 3,546 80 915 42 2,731 100 1,015 39 2,356 120 1,193 35 1,883 150 650 37 1,554 TREES REMAINING AFTER THE FIRST THINNING AT AGE 65 30 38 67 775 2,726 60 97 65 1,441 4,180 80 140 63 1,792 4,787 100 215 59 2,071 3,992 120 272 55 2,357 4,452 150 308 60 3,235 7,122 TREES CUT IN SECOND THINNING AT AGE 75 30 16 73 496 2,023 60 35 62 576 1,824 80 51 64 735 2,096 100 64 56 528 565 120 4/ 79 54 610 600 150 73 58 583 671 TREES REMAINING AFTER SECOND THINNING AT AGE 75 30 22 76 827 3,539 60 58 72 1,624 6,473 80 88 71 2,126 8,025 100 146 67 2,341 7,491 120 5/ 207 63 3,000 8,616 150 223 70 3,975 12,894 J/Quadratic mean diameter breast high. 2/Volume inside bark from ground to tip. 3/Scribner board feet to a 5-inch tip inside bark and an 8-foot minimum log length; that is, most logs are 9 inches outside bark and larger. 4/Average of two plots. One plot not thinned at age 75. 5_/Average of three Figure 2.—Ten years after thinning the Lookout Mountain study to growing-stock levels of 30 (A), 100(B), and 150 (C). 3. 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 perfec
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