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| Titel |
Microbial control on stability of soil organic matter in drought manipulation experiment |
| VerfasserIn |
E. Blagodatskaya, M. Schrumpf, E. Weber, T. Wutzler, G. Gleixner, M. Reichstein, S. Trumbore |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065721
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| Zusammenfassung |
| Extending drought periods as a consequence of global warming affect both the amount and
the activity of heterotrophic microorganisms in soil. The studies of drought effect on the
decomposition of soil organic matter (SOM) which is microbially mediated still show
controversial results mainly due to separated research approaches which do not consider the
soil – plant system as a whole.
We would like to discuss the results obtained within the QuaSOM experiment
(Max Planck Institute for Biogeochemistry Jena, Germany) where continues 13C-
CO2–labeling was applied during vegetation of peppermint (Mentha piperita L.)
under deficit and optimal moisture regimes. The partitioning of plant-originated and
SOM-originated carbon in heterotrophic respiration and in microbial biomass will be
related to the changes in the microbial growth parameters and enzymes kinetics.
The drought effect on temperature sensitivity of the enzymes responsible for the
decomposition of SOM-compounds of different availability will be compared in the
rhizosphere of peppermint versus bulk soil. The effect of vegetation on cycling
of organic matter in soil will be considered for the contrasting moisture regimes.
The changes in carbon sequestration potential due to priming effects caused by
repeated drying – rewetting events will be evaluated for the short term time scale. |
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