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Vertical Distribution of Annual Increment in Thinned Ponderosa Pine

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Changes in the pattern of radial growth of young Pinus ponderosa in the Black Hills of South Dakota were as predicted by the Schwendener-Metzger theory of bole development. Before thinning, the annual layers were widest at about 80 to 85 percent of tree height and narrowest at 20 to 25 percent of tree height. Radial growth of stagnated stands was increased by thinning; the most rapid growth usually began the third year after thinning and continued 3 to 6 years. During this period, the annual layers were widest at the tree bases and narrowest at about 70 percent of tree height. This change in growth pattern resulted in greatly increased taper. Average form quotients, bole form, and ratios of height to diameter approached the averages of Black Hills ponderosa pine. After the period of maximum radial growth, the annual layers were widest at about 85 percent of tree height and narrowest at about 25 percent of tree height. Thinning an overstocked but not stagnated stand did not change the pattern of vertical distribution of annual increment, bole form, taper, or ratios of height to diameter.
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Document Type: Journal Article

Affiliations: Research Forester, Rocky Mtn. Forest and Rge. Expt. Sta., Forest Service, U.S. Dept. Agric.,

Publication date: 01 December 1963

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