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): D.P. Gwaze; K.J. Harding; R.C. Purnell; Floyd E. Brigwater
    Date: 2002
    Source: Can. J. For. Res. 32: 1393-1399 (2002)
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (194 KB)


    Genetic and phenotypic parameters for core wood density of Pinus taeda L. were estimated for ages ranging from 5 to 25 years at two sites in southern United States. Heritability estimates on an individual-tree basis for core density were lower than expected (0.20-0.31). Age-age genetic correlations were higher than phenotypic correlations, particularly those involving young ages. Age--age genetic correlations were high, being greater than 0.75. Age-age genetic correlations had a moderately linear relationship, while age-age phenotypic correlations had a strong linear relationship with natural logarithm of age ratio. Optimum selection age for core density was estimated to be 5 years when calculations were based on both genetic and phenotypic correlations. However, age 5 was the youngest examined in this study and optimum selection age may be younger than 5. Generally, the optimum selection age was robust to changes in breeding phase and assumptions concerning age-related variation in heritability estimates. Early selection for core density would result in a correlated increase in earlywood density but little progress in latewood density or late- wood proportion at maturity.

    Publication Notes

    • You may send email to 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.


    Gwaze, D.P.; Harding, K.J.; Purnell, R.C.; Brigwater, Floyd E. 2002. Optimum Selection Age for Wood Density in Loblolly Pine. Can. J. For. Res. 32: 1393-1399 (2002)

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page