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Growth Response of Even-Aged Ponderosa Pine Related to Stand Density Levels in Arizona

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Dense stands of slow-growing ponderosa pines responded significantly to release. Forty-three-year-old stands, with an average stand density of 5,844 stems per acre and average dbh of 2.6 inches, were thinned in 1962 to test six residual growing stock levels (GSL) with numerical indices representing future basal areas in sq. ft. per acre ranging from 30 to 150. Net dbh periodic annual increment (PAI) was 4.6 times greater at GSL-30 and 2.2 times greater at GSL-150 during the first five years alter thinning than the pre-thinning rate. The net PAI in terms of square toot basal area and cubic foot volume increased significantly with increased GSL up to GSL-80, and then tapered off or decreased with increased GSL. Height increased insignificantly with increased stand density. Crown width increased most on trees in the lowest density stands. The PAI of the 100 largest trees per acre showed improvement in diameter, basal area and volume with increasing growing space.

Document Type: Journal Article

Affiliations: Principal Silviculturist, Rocky Mtn. Forest and Range Exp. Sta., U.S. Forest Service, Stationed at Flagstaff, Ariz., in cooperation with Northern Arizona University

Publication date: 1971-12-01

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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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