. Growth and yield of western hemlock in the Pacific Northwest following thinning near the time of initial crown closing. Forest thinning Northwest, Pacific; Trees Northwest, Pacific Growth; Western hemlock Northwest, Pacific. 60 70 \ Control plot 4-ft soacing \ \ Age 27 -s-Age 27 \^/ - 3 Average treatment site index is 106 Control site mrJex is 122 i re 0) ra c o E o k. u _c w o 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 Net basal area (ft2 acre) Figure 5.—Gross annual basal area increment, by level of basal area, for spacing treatments at Cascade Head. 10 Net basal area (m2
. Growth and yield of western hemlock in the Pacific Northwest following thinning near the time of initial crown closing. Forest thinning Northwest, Pacific; Trees Northwest, Pacific Growth; Western hemlock Northwest, Pacific. 60 70 \ Control plot 4-ft soacing \ \ Age 27 -s-Age 27 \^/ - 3 Average treatment site index is 106 Control site mrJex is 122 i re 0) ra c o E o k. u _c w o 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 Net basal area (ft2 acre) Figure 5.—Gross annual basal area increment, by level of basal area, for spacing treatments at Cascade Head. 10 Net basal area (m2 ha) 20 30 40 50 Absolute control, thinned / \J / / // - ". N. y/ \^ y spaong /" - \ > \ Age 22 Average site index is 124 ~|~~ Average standard deviation at age 14 I 5 >> T ra • 4 § ra 0) ra r. ra cf (/) ra C p E 2 a o c 10 (/) 1 e a 20 40 60 80 100 120 140 160 180 200 220 Net basal area (ft2 acre) Figure 6.—Gross annual basal area increment, by level of basal area, for early and late spacing treatments at Clallam Bay. 17. 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 Hoyer, Gerald E. dn; Swanzy, Jon D. cn; Pacific Northwest Research Station (Portland, Or. ) cn. [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
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