Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Allan E. Tiarks; V. Clark Baldwin
    Date: 1999
    Source: Paper presented at the Tenth Biennial Southern Silvicultural Research Conference, Shreveport, LA, February 16-16,1999.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (106 KB)

    Description

    Inside-bark diameter measurements at 6.64 intervals of 137 loblolly, 52 shortleaf, and 64 slash pines were used to calculate the actual volume and taper of each species for comparison with volumes and tapers predicted from published equations. The loblolly pine were cut in Texas (TX) and Louisiana (LA) while the shortleaf was sampled only in TX. The slash pine were sampled in Mississippi (MS). The models had been developed using trees that had the same diameter and height distributions as the validation data; however, the validation trees were generally older. For loblolly and slash pine, the volume equations over-predicted the average volume by 1.5 and 3.7 ft³/tree, respactlvaly, or about 5 to 10 percent of tree volume. The taper equation for loblolly was adequate, but the slash pine taper equation did not fit the data well. There is no appropriate volume or taper model for shortleaf pine. However, the loblolly equations predicted both volume and taper of the shortleaf pine data as well as or better than they did for the loblolly data. The loblolly and slash pine equations can be used with confidence-about half of the errors appear to be random, indicating that the best equations will have an error of about 1.5 ft³/tree regardless of tree size. Most prediction ermrs occurred In larger trees, indicating that some improvement could be made in taper-volume models by adding age as a variable. Specks seems to be less important, and future modeling efforts should evaluate combined species equations.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Tiarks, Allan E.; Baldwin, V. Clark, Jr. 1999. Validation of Volume and Taper Equations For Loblolly Shortleaf and Slash Pine. Paper presented at the Tenth Biennial Southern Silvicultural Research Conference, Shreveport, LA, February 16-16,1999.

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/2138