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    Author(s): Joshua P. Adams; Samuel B. Land; Thomas G. Matney
    Date: 2006
    Source: Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 296-300
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (268 KB)

    Description

    Profile measurements were taken on a stratified sample of 19-year-old trees from 8 North Carolina families and a commercial Mississippi-Alabama check established at 3 spacings (5 x 5, 8 x 8, and 10 x 10 feet). Measurements were first fitted on a single profile equation using multiple-regression. Data were also segregated by family, spacing, and family-byspacing and fitted on the equation. These new model types were tested using the reduction-sum-of-squares principle. Stem volumes were calculated using the different model types and compared. A significant decrease of error was obtained from the reduction-sum-of-squares method, indicating that accuracy of stem-volume estimation can be increased by accounting for family and spacing in the profile equation.

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    Citation

    Adams, Joshua P.; Land, Samuel B., Jr.; Matney, Thomas G. 2006. Family and spacing affect stem profile of loblolly pine at age 19. Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 296-300

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