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DIVISION S-3—NOTES

A CARBON DIOXIDE FLUX GENERATOR FOR TESTING INFRARED GAS ANALYZER-BASED SOIL RESPIRATION SYSTEMS

^a Dep. of Forest Resources, 115 Green Hall, Univ. of Minnesota, 1530 Cleveland Ave. N., St. Paul, MN 55108
^b Dep. of Soil Science, Univ. of Wisconsin-Madison, 1525 Observatory Dr., Madison, WI 53706

^* Corresponding author (mart0166{at}umn.edu).

An artificial flux generation device was developed to test the accuracy of a closed-dynamic soil respiration system (LICOR 6400). The device consisted of an enclosed reservoir with a porous top; the reservoir contained a volume of CO₂ enriched air, which was monitored by an infrared gas analyzer (IRGA). When the internal CO₂ concentration within the reservoir was elevated, diffusion rates through the porous medium were measured by recording changes in CO₂ concentration within the reservoir. This diffusion-based artificial flux mimics natural soil respiration, and allows an independent verification of the accuracy of soil respiration measurement systems. We tested a LI-COR 6400 portable photosynthesis system fitted with a 6400-09 soil CO₂ flux chamber. On average, this system overestimated high flux rates by 2 to 4% and underestimated low flux rates by 4 to 20% over five independent trials. Soil respiration appeared to be sensitive to boundary layer mixing, and ambient CO₂ concentrations.

Abbreviations: IRGA, Infrared Gas Analyzer

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