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Stand-Level Height-Diameter Equations for Young Ponderosa Pine Plantations in Neuquén, Patagonia, Argentina: Evaluating Applications of Equations Developed in the Western United States

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Two linear and two nonlinear height-diameter models commonly used in the western United States were tested for the young ponderosa pine (Pinus ponderosa) plantations of northern Patagonia, where it is the most widely planted species. The equations were fitted to each of 127 plots, located throughout the geographic range of the plantations in Neuquén province. The four equations were compared using Furnival's (1961) index of fit. Even though there were no important differences among models tested, the nonlinear model previously applied by Wykoff et al. (1982), H = 1.3 + exp0 + (β1/(D + 2.54))) + ε was preferable because it converged more efficiently than the other nonlinear equation and was more flexible than the linear functions. Differences in the behavior of plot-level and regionwide equations demonstrated the biases possible if regionwide equations are applied to estimate missing heights within a plot. The coefficients for the two nonlinear models fitted to trees growing in several regions in the western United States generally overestimated the height of Neuquén trees. West. J. Appl. For. 19(3):202–210.
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Keywords: Neuquén; Patagonia; Pinus ponderosa; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; height-diameter equations; natural resource management; natural resources

Document Type: Regular Article

Affiliations: 1: Patagonian Andes Forest Research and Extension Center (CIEFAP), CC 14 Esquel Chubut Argentina 9200 Phone: +54 (2945) 453948, Email: [email protected] 2: Department of Forest Science Oregon State University Corvallis OR 97331-5752 3: Asentamiento Universitario San Martin de los Andes (AUSMA) Universidad del Comahue San Martin Neuquén Argentina 8370 4: Department of Forest Engineering Oregon State University Corvallis OR 97331-5706

Publication date: 2004-07-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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