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): John R. ButnorKurt H. JohnsenChris A. Maier
    Date: 2005
    Source: Biogeochemistry 73: 283-301
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (1.16 MB)


    Soil C02 efflux is a major component of net ecosystem productivity (NEP) of forest systems. Combining data from multiple researchers for larger-scale modeling and assessment will only be valid if their methodologies provide directly comparable results. We conducted a series of laboratory and field tests to assess the presence and magnitude of soil CO2 efflux measurement system x environment interactions. Laboratory comparisons were made with a dynamic, steady state C02 flux generation apparatus, wherein gas diffusion drove flux without creating pressure differentials through three artificial soil media of varying air-filled porosity. under these conditions, two closed systems (Li-6400-09 and SRC-1) exhibited errors that were dependent on physical properties of the artificial media. The open system (ACES) underestimated C02 flux. However, unlike the two other systems. the ACES results could be corrected with a single calibration equation that was unaffected by physical differences in artificial media. Both scale and rank changes occurred among the measurement systems across four sites. Our work clearly shows that soil C02 efflux measurement system x environment interactions do occur and can substantially impact estimates of soil COz efflux. Until reliable calibration techniques are developed and applied, such interactions make direct comparison of published rates, and C budgets estimated using such rates, difficult.

    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.


    Butnor, John R.; Johnsen, Kurt H.; Maier, Chris A. 2005. Soil properties differently influence estimates of soil CO2 efflux from three chamber-based measurement systems. Biogeochemistry 73: 283-301


    Calibration, CO2 efflux, diffusivity, porosity, soil CO2 efflux, soil respiration

    Related Search

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