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| Titel |
Carbon isotope anomaly in the major plant C1 pool and its global biogeochemical implications |
| VerfasserIn |
F. Keppler, R. M. Kalin, D. B. Harper, W. C. McRoberts, J. T. G. Hamilton |
| 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 ; 1, no. 2 ; Nr. 1, no. 2 (2004-12-13), S.123-131 |
| Datensatznummer |
250000137
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| Publikation (Nr.) |
 copernicus.org/bg-1-123-2004.pdf |
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| Zusammenfassung |
| We report that the most abundant C1 units of terrestrial plants, the
methoxyl groups of pectin and lignin, have a unique carbon isotope signature
exceptionally depleted in 13C. Plant-derived C1 volatile organic
compounds (VOCs) are also anomalously depleted in 13C compared with
Cn+1 VOCs. The results confirm that the plant methoxyl pool is the
predominant source of biospheric C1 compounds of plant origin such as
methanol, chloromethane and bromomethane. Furthermore this pool, comprising
ca 2.5% of carbon in plant biomass, could be an important substrate for
methanogenesis and thus be envisaged as a possible source of isotopically
light methane entering the atmosphere. Our findings have significant
implications for the use of carbon isotope ratios in elucidation of global
carbon cycling. Moreover methoxyl groups could act as markers for biological
activity in organic matter of terrestrial and extraterrestrial origin. |
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