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| Titel |
Straw application in paddy soil enhances methane production also from other carbon sources |
| VerfasserIn |
Q. Yuan, J. Pump, R. Conrad |
| 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 ; 11, no. 2 ; Nr. 11, no. 2 (2014-01-22), S.237-246 |
| Datensatznummer |
250117138
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| Publikation (Nr.) |
 copernicus.org/bg-11-237-2014.pdf |
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| Zusammenfassung |
| Flooded rice fields are an important source of the greenhouse gas methane.
Methane is produced from rice straw (RS), soil organic matter (SOM), and
rice root organic carbon (ROC). Addition of RS is widely used for
ameliorating soil fertility. However, this practice provides additional
substrate for CH4 production and results in increased CH4
emission. Here, we found that decomposing RS is not only a substrate of
CH4 production, but in addition stimulates CH4 production from
SOM and ROC. Apart from accelerating the creation of reduced conditions in
the soil environment, RS decomposition resulted in enhancement of
SOM-derived CH4 production. In particular, hydrogenotrophic
methanogenesis from SOM-derived CO2 was stimulated, presumably by
H2 released from RS decomposition. On the other hand, the enhancement
of ROC-derived CH4 production after RS application was probably caused
by the significant increase of the abundance of methanogenic Archaea in the
RS treatment compared with the untreated control. Our results show that
traditional management of rice residues exerts a positive feedback on
CH4 production from rice fields, thus exacerbating its effect on the
global CH4 budget. |
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