Measuring the CO2 production from maize-straw-amended soil columns— a comparison of four methods
Corresponding Author
Nils Rottmann
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, GermanySearch for more papers by this authorRainer Georg Joergensen
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany
Search for more papers by this authorCorresponding Author
Nils Rottmann
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, GermanySearch for more papers by this authorRainer Georg Joergensen
Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany
Search for more papers by this authorAbstract
A soil-column experiment with maize-straw application at different depths was carried out to investigate the accuracy of CO2-measurement systems in a greenhouse experiment with sandy and loamy soils. The classical approach of CO2 absorption in NaOH solution was compared with three other methods using dynamic chambers. These methods were gas chromatography (GC), a portable infrared analyzer (IR), and a portable photo-acoustic system (PAS). The cumulative CO2 production over the 57-day incubation period was significantly affected by the method and soil-specifically by the treatments. The NaOH and GC method always formed a pair of lowest cumulative CO2 production in all treatments with maize-straw addition. In the treatments with bottom application of the maize straw, IR and PAS methods gave values at identical levels in both soils. In the treatments with top application of the maize straw, the IR method gave significantly highest values in the sandy soil and the PAS method in the loamy soil. The correlation coefficients between the cumulative CO2 production of the three dynamic-chamber methods (GC, IR, and PAS) and the static NaOH method were all significant, with r values between 0.90 and 0.93. The C balance can be used for testing the plausibility of CO2-production data. Roughly 102% (NaOH and GC) and 114% (IR and PAS) were recovered, including the CO2-production data in the C balance of the sandy soil. The respective data were 97% (NaOH and GC) and 104% (IR and PAS) for the loamy soil.
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