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): Filipe G. Sanchez; Maurice M. Bursey
    Date: 2002
    Source: Forest Ecology and Management 160 (2002) 177-185
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (172 KB)

    Description

    The region immediately adjacent to established roots of mature trees has been termed the "reoccurring rhizosphere" and it has been hypothesized that organic matter input from fine root turnover, root exudates and sloughing may result in a build up of the soil carbon in this region. The "reoccurring rhizosphere" for first-, second- and third-order roots of select loblolly pines (Pinus taeda L.) were examined on sandy, loamy sand and sandy loamy soils. A significant carbon build up next to the root orders was confirmed for the sandy and loamy sand soils. The carbon build up was substantial (55% increase) next to the first- order roots of the sandy soil. However, the sandy loam soil did not display a significant amount of carbon build up next to the root orders. Extraction of the soil samples with supercritical freon-22 showed that the additional carbon in the "reoccurring rhizosphere" was highly soluble. Approximately 60% of the total soil carbon was extracted from the sandy and loamy sand soils, while approximately 40% was extracted from the sandy loamy soil. A qualitative comparison of the extracts by liquid state 13C nuclear magnetic resonance showed that the "reoccurring rhizosphere" region had a higher relative proportion of labile materials (i.e. carbohydrates, proteins, etc.) than the bulk soil. This information coupled with the high solubility in superclitical freon-22 suggests that the carbon build up in the "reoccurring rhizosphere" region of loblolly pines may be transient in nature.

    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

    Sanchez, Filipe G.; Bursey, Maurice M. 2002. Transient nature of rhizosphere carbon elucidated by supercritical freon-22 extraction and 13C NMR analysis. Forest Ecology and Management 160 (2002) 177-185

    Keywords

    Roots, Soil organic matter, Rhizosphere, Nuclear magnetic resonance, Carbon

    Related Search


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