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Growth of Thinned Young Lodgepole Pine in Colorado

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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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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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