Growth of Thinned Young Lodgepole Pine in Colorado
Abstract:Two kinds of thinnings were made. Uniform thinning reserved 630 trees per acre, spaced an average of 8.5 feet apart. Crop-tree thinning released approximately 100 trees per acre, spaced an average 21 feet apart, by cutting openings 16 feet in diameter around each selected tree. Thinnings stimulated diameter growth of the best 100 trees under both treatments and of all trees on the uniformly thinned plots. Height growth was unchanged. Basal area increment was unaffected. Thinning initially reduced total cubic-foot volume increment, but after 8 years growth was the same on thinned and unthinned plots. Volume in pulpwood-sized trees was increased only by uniform thinning. The uniform method best meets the objectives of thinning. Earlier stumpage returns are indicated, and total stand growth will be redistributed on fewer but better quality stems.
Document Type: Journal Article
Affiliations: Research Forester, Rocky Mountain Forest and Range Expt, Sta., Forest Service, U. S. Dept. Agric with central headquarters at Fort Collins, Colo., in cooperation with Colorado State University
Publication date: June 1, 1965
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