Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (1.16 MB bytes)

Title: Soil properties differently influence estimates of soil CO2 efflux from three chamber-based measurement systems

Author: Butnor, John R.; Johnsen, Kurt H.; Maier, Chris A.;

Date: 2005

Source: Biogeochemistry 73: 283-301

Publication Series: Miscellaneous Publication

Description: 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.

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

Publication Notes:

  • 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.
  • 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.)



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


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.