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  The occurrence of short chain n-alkanes with an even over odd predominance in higher plants and soils

Kuhn, T. K., Krull, E. S., Bowater, A., Grice, K., & Gleixner, G. (2010). The occurrence of short chain n-alkanes with an even over odd predominance in higher plants and soils. Organic Geochemistry, 41(2), 88-95. doi:10.1016/j.orggeochem.2009.08.003.

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 Urheber:
Kuhn, T. K., Autor
Krull, E. S., Autor
Bowater, A., Autor
Grice, K., Autor
Gleixner, G.1, Autor           
Affiliations:
1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497773              

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Schlagwörter: organic-matter hydrocarbon constituents geochemical significance vegetation change ecuadorian andes lipids sediments paraffins delta-c-13 australia
 Zusammenfassung: In this study we provide data which support the interpretation that tissues of higher plants can constitute a significant source of the short chain n-alkanes with an even/odd predominance (EOP) found in soil organic matter. Gas chromatographic analyses of vegetation (C-3 trees, C-4 grasses) and associated soil samples (woodland and grassland) from a study site in central Queensland, Australia, revealed that (1) woody vegetation (leaves) and grasses (leaves, roots) contain short chain n-alkanes (C-14-C-20) with pronounced EOP and (2) such homologues dominate the n-alkane assemblages in its woodland and grassland soils. The presence of short chain n-alkanes with an EOP in some of the vegetation suggests that these may represent a significant source of such alkanes in the woodland and grassland soils. Previous studies have shown that combustion induced thermal breakdown of long chain n-alkanes may produce short chain homologues with an EOP. A history of repeated bushfires at the study site may have contributed to the presence of these n-alkanes in its soils. The co-occurrence of polyaromatic hydrocarbons derived from fire (e.g. retene) indicates that heat related generation of short chain n-alkames indeed may have played an additional part in the formation of the observed soil n-alkane patterns. These two potential origins were further investigated by compound specific carbon and hydrogen isotope analyses of the plant and soil n-alkane assemblages. These data show that the delta C-13 and delta D signatures of the short chain n-alkanes in the soil resemble those of the plants. Our study therefore provides strong evidence that EOP among short chain n-alkanes can represent a primary (i.e. non-diagenetic) signature, which originates directly from biological sources. in the case of this Queensland soil, the leaves and roots of higher plants are likely to be the principal sources, together with a smaller secondary contribution from the combustion of associated long chain n-alkanes during bushfires. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

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Sprache(n): eng - English
 Datum: 2010
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.orggeochem.2009.08.003
ISI: ://000274770000005
Anderer: BGC1327
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Titel: Organic Geochemistry
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford : Pergamon
Seiten: - Band / Heft: 41 (2) Artikelnummer: - Start- / Endseite: 88 - 95 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925474428
ISSN: 0146-6380