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| Titel |
The role of photo- and thermal degradation for CO2 and CO fluxes in an arid ecosystem |
| VerfasserIn |
H. van Asperen, T. Warneke, S. Sabbatini, G. Nicolini, D. Papale, J. Notholt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 13 ; Nr. 12, no. 13 (2015-07-14), S.4161-4174 |
| Datensatznummer |
250118020
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| Publikation (Nr.) |
 copernicus.org/bg-12-4161-2015.pdf |
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| Zusammenfassung |
Recent studies have suggested the potential importance of abiotic
degradation in arid ecosystems. In this study, the role of photo- and
thermal degradation in ecosystem CO2 and CO exchange
is assessed. A field experiment was performed in Italy using
an FTIR-spectrometer (Fourier Transform Infrared) coupled to a flux gradient system and to flux
chambers. In a laboratory experiment, field samples were exposed to
different temperatures and radiation intensities.
No photodegradation-induced CO2 and CO fluxes of in literature suggested magnitudes were
found in the field nor in the laboratory study. In the laboratory, we measured CO2 and
CO fluxes that were derived from thermal degradation. In the field experiment,
CO uptake and emission have been measured and are proposed to be a result of biological uptake and
abiotic thermal degradation-production.
We suggest that previous studies, addressing direct photodegradation,
have overestimated the role of photodegradation and observed fluxes
might be due to thermal degradation, which is an indirect effect of
radiation. The potential importance of abiotic decomposition in the
form of thermal degradation, especially for arid regions, should be
considered in future studies. |
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