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Open Access Green as soon as Postprint is submitted to ZB.
Flow-microcalorimetry measurements of aerobic and anaerobic soil microbial activity.
Biol. Fertil. Soils 10, 203-208 (1995)
Heat output can be used as an indicator of microbial activity and is usually measured in a microcalorimeter with closed ampoules. In long-term experiments particularly, interpretation of the data is hindered by the changing environment in the closed ampoules because of O2 consumption and CO2 enrichment. We used a combination of a flow-microcalorimeter and a gas chromatograph to measure the heat flux and CO2 and N2O production rates under controlled conditions. Simultaneous detection of the heat output and CO2 emission allowed calculation of the calorimetric: CO2 (Cal/CO2) ratio. A mean ratio of-435 kJ mol-1 CO2 was detected in six different soils amended with glucose and incubated under aerobic conditions. This ratio indicated that CO2 was the end-product of catabolism. In wet 10-12 mm soil aggregates of a gleyic vertisol amended with glucose, values of-285 kJ mol-1 CO2 under an aerobic and-141 kJ mol-1 CO2 under a N2 atmosphere was determined. These findings indicated that fermentative metabolism occurred. The Cal/CO2 ratio was not affected when enough NOinf3 sup-was available and denitrification processes (N2O production) were possible. © 1995 Springer-Verlag.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Flow-microcalorimeter; CO2; Cal/CO2 ratio; N2O; Aggregates
ISSN (print) / ISBN
0178-2762
e-ISSN
1432-0789
Journal
Biology and Fertility of Soils
Quellenangaben
Volume: 10,
Issue: 2-3,
Pages: 203-208
Publisher
Springer
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Soil Ecology (IBOE)