Abstract
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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