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NOTES & UNIQUE PHENOMENA

Carbon Dioxide Flux Measurement During Simulated Tillage

^a USDA-ARS, Columbia Plateau Conservation Research Center, P.O. Box 370, Pendleton, OR 97801
^b 920 Reeser Rd, Walla Walla, WA 99362

^* Corresponding author (stewart.wuest{at}oregonstate.edu)

Received for publication February 7, 2002. Measurement of tillage effects often includes CO₂ flux from soil before and after tillage. Our objective was to create a device to measure CO₂ flux continuously before, during, and after a simulated tillage operation. We put an auger inside a chamber to till the soil while monitoring CO₂ flux. We tested three soil conditions. First, cores stored long-term produced large peaks immediately after tillage followed by a steady rate decay. Second, simulated tillage in a summer fallow field produced a more modest peak, a rapid return to pretillage rate, and then a gradual climb in CO₂ flux rate over the next 10 min. The third soil condition, having sterilized topsoil, produced a peak and then immediately returned to the pretillage flux rate. We conclude that continuous monitoring before, during, and after tillage will be important for proper interpretation of flux data.

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