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| Titel |
The feedback effect of the microbial community on SOM decomposition may obscure the true temperature response of heterotrophic soil respiration during incubation experiments |
| VerfasserIn |
B. Scharnagl, M. Herbst, H. Vereecken |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022471
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| Zusammenfassung |
| Our current understanding of the temperature dependence of soil organic matter (SOM)
cycling is still limited. The topic is of practical relevance because there might exist a positive
feedback to global warming. Many studies that investigate the temperature dependence of
heterotrophic soil respiration are based on incubation experiments performed in the
laboratory. During laboratory incubation, however, the more labile carbon pools
are depleted rapidly, and as a consequence, the microbial activity is expected to
decrease with time as well. This effect, however is not included in the models used to
interpret the data obtained from laboratory incubations. In this modelling study, we
demonstrate that the feedback effect of the size of the microbial community on the
decomposition process may not be ignored when interpreting incubation experiments.
We used a modified version of the ROTHC model that includes the feedback of
the microbial community on SOM decomposition to simulate a typical incubation
experiment. We then interpreted these data using a modified Q10 model. Moreover,
we inversely estimated the posterior distributions of the underlying temperature
response parameters using a Bayesian approach and visualized the correlation between
them. The results indicate that the feedback of the microbial community on SOM
decomposition may obscure the true temperature response and - if not inlcuded in data
analysis - may lead to biased conclusions about the future behavior of warming soils. |
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