Use of Carbon Isotope Composition for Characterization of Microbial Activity in Arable Soils

The effect of glucose on microbial mineralization of soil organic matter (SOM) was studied in arable soil specimens. The fluxes of carbon dioxide generated during this degradation were deduced from differences in the carbon isotope abundance ratios of glucose δ^sup 13^C = -11.4 per mil) and SOM δ^su...

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Bibliographic Details
Published in:Applied biochemistry and microbiology 2005-09, Vol.41 (5), p.512-520
Main Authors: Zyakun, A M, Dilly, O
Format: Article
Language:English
Subjects:
Carbon
Carbon dioxide
Carbon isotopes
Isotopes
Microbial activity
Mineralization
Organic matter
Soil organic matter
Soils
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Summary:The effect of glucose on microbial mineralization of soil organic matter (SOM) was studied in arable soil specimens. The fluxes of carbon dioxide generated during this degradation were deduced from differences in the carbon isotope abundance ratios of glucose δ^sup 13^C = -11.4 per mil) and SOM δ^sup 13^C = -27.01 per mil). The priming effect of glucose and respiratory quotient (RQ) were taken as indices of activation of SOM-consuming microbiota. The data on microbial mineralization of organic matter in soil obtained in this study show that the addition of a readily consumable substance (glucose) to soil favors SOM degradation and increases the release of carbon dioxide from soil to atmosphere.[PUBLICATION ABSTRACT]
ISSN:0003-6838
1608-3024
DOI:10.1007/s10438-005-0093-6