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


    We measured forest floor CO2 flux in two contrasting ecosystems (white pine plantation and northern hardwood ecosystems at low and high elevations, respectively) in May and September 1993 to quantify differences and determine factors regulating CO2 fluxes. An automated IRGA based, flow through system was used with chambers inserted into the soil. This approach allowed quantification of diurnal flux patterns which were subsequently averaged to estimate daily mean flux rates (µmol m-2s-1). Mean flux rates were 60 percent greater in the white pine ecosystem (8.9 µmol m-2s-1) than in the northern hardwood ecosystem (5.6 µmol m-2s-1). Across ecosystems and sample dates, the most important regulating factor was soil temperature (r2 = 0.70; p < 0.0001). Mean (24-hr) soil temperature (at 5 cm depth) was 2.5°C lower in the northern hardwood stand relative to the white pine stand. All other parameters considered (i.e., soil C:N, root mass, root C:N, litter C:N, litter mass) did not explain the differences in flux rates between sites, but variation in fine root mass and litter C:N did explain spatial and temporal variation within the northern hardwood site. These results indicated that at large spatial scales, variation in soil temperature was more important in regulating forest floor CO2 flux than factors more closely associated with the species composition and productivity of the sites (e.g., litter and root mass and quality).

    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.


    Vose, James M.; Clinton, Barton D.; Emrick, Verl. 1995. Forest Floor CO2 Flux From Two Contrasting Ecosystems in the Southern Appalachians. In: USDA Forest Service Northeast Research Station General Technical Report NE-197, p. 165-170

    Related Search

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