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Notes: Short-Term Projection Accuracy of Five Asymptotic Height-Age Curves for Loblolly Pine

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Height-age data from the Southwide Pine Seed Source Study of loblolly pine plantations were used to evaluate short-term projection accuracy of five nonlinear asymptotic height-age curves: Cilliers-Van Wyk, Chapman-Richards, first-degree logistic, Gompertz, and Lundqvist. Upper asymptotes were selected for each plot by two alternative methods: fixed at a reasonable value, and estimated from the data through age 20. Accuracy was assessed by comparing observed top heights at age 25 with predicted top heights at this age. For short-term projections of height-age curves, the Cilliers-Van Wyk, Chapman-Richards, and Lundqvist models show promise, especially when the upper asymptote is fixed. Forest Sci. 31:414-418.

Keywords: Pinus taeda; growth models; height growth

Document Type: Miscellaneous

Affiliations: Assistant Professor, School of Forestry, Wildlife, and Fisheries, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803

Publication date: 1985-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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