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dc.contributor.authorRethemeyer, Janet
dc.contributor.authorKramer, Christiane
dc.contributor.authorGleixner, Gerd
dc.contributor.authorWiesenberg, Guido L. B.
dc.contributor.authorSchwark, Lorenz
dc.contributor.authorAndersen, Nils
dc.contributor.authorNadeau, Marie-J.
dc.contributor.authorGrootes, Pieter M.
dc.date.accessioned2021-02-11T21:45:27Z
dc.date.available2021-02-11T21:45:27Z
dc.date.issued2004-01-01
dc.identifier.citationRethemeyer, J., Kramer, C., Gleixner, G., Wiesenberg, G. L., Schwark, L., Andersen, N., ... & Grootes, P. M. (2004). Complexity of soil organic matter: AMS 14C analysis of soil lipid fractions and individual compounds. Radiocarbon, 46(1), 465-473.
dc.identifier.issn0033-8222
dc.identifier.doi10.1017/S0033822200039771
dc.identifier.urihttp://hdl.handle.net/10150/654763
dc.descriptionFrom the 18th International Radiocarbon Conference held in Wellington, New Zealand, September 1-5, 2003.
dc.description.abstractRadiocarbon measurements of different lipid fractions and individual compounds, isolated from soil samples collected on 2 different agricultural long-term study sites, located in the rural area of Rotthalmunster (Germany) and in the city of Halle/Saale (Germany), were analyzed to obtain information about sources and the stability of soil organic matter (SOM). Different lipid compound classes were isolated by automated solvent extraction and subsequent medium-pressure liquid chromatography. Generally, 14C contents of lipid compound classes from topsoil samples of maize plots at Rotthalmünster are close to the modern atmospheric 14C content. Lower 14C values of aliphatic and aromatic hydrocarbons isolated from neutral lipids suggest a contribution of old carbon to these fractions. In contrast, 14C values of bulk soil (52 pMC) as well as isolated lipid classes from Halle are highly depleted. This can be attributed to a significant contribution of fossil carbon at this site. Extremely low 14C contents of aromatic (7 pMC) and aliphatic hydrocarbons (19 pMC) reflect the admixture of fossil hydrocarbons at the Halle site. Individual phospholipid fatty acids (PLFA), which are used as a proxy for viable microbial biomass, were isolated by preparative capillary gas chromatography (PCGC) from topsoils at Rotthalmünster and Halle. PLFA 14C values are close to atmospheric 14C values and, thus, indicate a clear microbial preference for relatively young SOM. At Rotthalmünster, the 14C concentration of short-chain unsaturated PLFAs is not significantly different from that of the atmosphere, while the saturated PLFAs show a contribution of sub-recent SOM extending over the last decades. At Halle, up to 14% fossil carbon is incorporated in PLFAs n-C17:0 and cy-C18:0, which suggests the use of fossil carbon by soil microorganisms. Moreover, it can be concluded that the 14C age of soil carbon is not indicative of its stability.
dc.language.isoen
dc.publisherDepartment of Geosciences, The University of Arizona
dc.relation.urlhttp://radiocarbon.webhost.uits.arizona.edu/
dc.rightsCopyright © by the Arizona Board of Regents on behalf of the University of Arizona. All rights reserved.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectaccelerator mass spectra
dc.subjectaliphatic hydrocarbons
dc.subjectaromatic hydrocarbons
dc.subjectbiomarkers
dc.subjectbiomass
dc.subjectC 14
dc.subjectcarbon
dc.subjectcarbon cycle
dc.subjectCentral Europe
dc.subjectEurope
dc.subjectfatty acids
dc.subjectgas chromatograms
dc.subjectgeochemical cycle
dc.subjectGermany
dc.subjectHalle Germany
dc.subjecthydrocarbons
dc.subjectisotopes
dc.subjectlipids
dc.subjectmass spectra
dc.subjectorganic acids
dc.subjectorganic compounds
dc.subjectpreparative capillary gas chromatography
dc.subjectradioactive isotopes
dc.subjectRotthalmunster Germany
dc.subjectSaxony Anhalt Germany
dc.subjectsoils
dc.subjectspectra
dc.titleComplexity of Soil Organic Matter: AMS 14C Analysis of Soil Lipid Fractions and Individual Compounds
dc.typeProceedings
dc.typetext
dc.identifier.journalRadiocarbon
dc.description.collectioninformationThe Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume46
dc.source.issue1
dc.source.beginpage465
dc.source.endpage473
refterms.dateFOA2021-02-11T21:45:27Z


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