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Albers, B.P. ; Beese, F. ; Hartmann, A.

Flow-microcalorimetry measurements of aerobic and anaerobic soil microbial activity.

Biol. Fertil. Soils 10, 203-208 (1995)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
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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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Flow-microcalorimeter; CO2; Cal/CO2 ratio; N2O; Aggregates
ISSN (print) / ISBN 0178-2762
e-ISSN 1432-0789
Zeitschrift Biology and Fertility of Soils
Quellenangaben Band: 10, Heft: 2-3, Seiten: 203-208 Artikelnummer: , Supplement: ,
Verlag Springer
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Soil Ecology (IBOE)