Widén B, Lindroth A. 2003. A calibration system for soil carbon dioxide-efflux measurement chambers: description and application. Soil Science Society of America Journal, 67: 327-334.
These authors describe a system for the absolute calibration of CO2-flux from soils, for both open- and closed-chamber type systems. The basic design is a large box, topped with a layer of sand, into which CO2 is pumped at a known rate. The measurement chamber sits on top of the layer of sand, and the actual gas flux can be calculated and compared to that measured by the machine.
The system appears to be useful, and a significant improvement in the field. The authors caution that improvements need to be made to the system, cheifly in its size and consideration of the effects of water in the soil on gas flux variations.
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