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): N.T. King; J.R. Seiler; T.R. Fox; KurtH Johnsen
    Date: 2008
    Source: Tree Physiology, Vol. 28: 703-711
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (144 KB)

    Description

    The physiological processes leading to enhanced growth of loblolly pine (Pinus taeda L.) following fertilization are not clearly understood. Part of the debate revolves around the temporal response of net photosynthetic rate (An) to fertilization and whether the An response is always positive. We measured light-saturated photosynthetic rate (Asat), dark respiration rate, growth and crown silhouette area in eight clones of loblolly pine before and after nitrogen (N) fertilization (112 kg ha–1) to track the initial physiological changes prior to any changes in growth. Overall, there were positive photosynthetic and growth responses to fertilization; however, there were pronounced physiological and growth differences among clones, even among clones with the same parents. Clones 4, 6 and 7 showed large volume growth and Asat responses to fertilization. Clone 1 and Clone 8 (a full-sibling of Clone 7) mainly showed a volume growth response, whereas Clone 2 (full-sibling of Clone 1) showed an Asat response only. Clone 5 (full-sibling of Clone 6) showed little response to fertilization, whereas Clone 3 (full-sibling of Clone 4) showed a negative Asat response. Thus, within-family variationwarrants further study to ensure that relatively expensive clonal material is used efficiently.

    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

    King, N.T.; Seiler, J.R.; Fox, T.R.; Johnsen, KurtH. 2008. Post-fertilization physiology and growth performance of loblolly pine clones. Tree Physiology, Vol. 28: 703-711

    Keywords

    crown area, gas exchange, net photosynthesis, nitrogen, Pinus taeda

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/29973