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    Complexity of Soil Organic Matter: AMS 14C Analysis of Soil Lipid Fractions and Individual Compounds

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    Author
    Rethemeyer, Janet
    Kramer, Christiane
    Gleixner, Gerd
    Wiesenberg, Guido L. B.
    Schwark, Lorenz
    Andersen, Nils
    Nadeau, Marie-J.
    Grootes, Pieter M.
    Issue Date
    2004-01-01
    Keywords
    accelerator mass spectra
    aliphatic hydrocarbons
    aromatic hydrocarbons
    biomarkers
    biomass
    C 14
    carbon
    carbon cycle
    Central Europe
    Europe
    fatty acids
    gas chromatograms
    geochemical cycle
    Germany
    Halle Germany
    hydrocarbons
    isotopes
    lipids
    mass spectra
    organic acids
    organic compounds
    preparative capillary gas chromatography
    radioactive isotopes
    Rotthalmunster Germany
    Saxony Anhalt Germany
    soils
    spectra
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    Citation
    Rethemeyer, 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.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 18th International Radiocarbon Conference held in Wellington, New Zealand, September 1-5, 2003.
    URI
    http://hdl.handle.net/10150/654763
    DOI
    10.1017/S0033822200039771
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Radiocarbon 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.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200039771
    Scopus Count
    Collections
    Radiocarbon, Volume 46, Number 1 (2004)

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