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    13C-depleted charcoal from C4 grasses and the role of occluded carbon in phytoliths

    Access Status
    Fulltext not available
    Authors
    Krull, E
    Skjemstad, J
    Graetz, D
    Grice, Kliti
    Dunning, William
    Cook, G
    Parr, J
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Krull, E and Skjemstad, J and Graetz, D and Grice, Kliti and Dunning, William and Cook, G and Parr, J. 2003. 13C-depleted charcoal from C4 grasses and the role of occluded carbon in phytoliths. Organic Geochemistry. 34: pp. 1337-1352.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/S0146-6380(03)00100-1
    ISSN
    0146-6380
    Faculty
    Department of Applied Chemistry
    School of Science and Computing
    Faculty of Science and Engineering
    Remarks

    The link to the journal’s home page is: "http://www.elsevier.com/wps/find/journaldescription.cws_home/622273/description#description" Copyright © 2003 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/42404
    Collection
    • Curtin Research Publications
    Abstract

    The 13C values of plants and corresponding charred materials from wood, C3 and C4 grasses, derived from natural burning and laboratory combustion were obtained to determine whether there was a significant difference in 13C of grass-derived char (C3 and C4) compared with wood-derived (C3) char. Our data showed that there is an up to 8% 13C-depletion in C4-derived chars from natural burning but there was no significant isotopic change in chars from wood or C3 grasses. We suggest that this 13C-depletion in C4-derived chars is due to protected organic matter in silicate structures (phytoliths), which were found to be depleted by up to 9%. Analysis of this protected carbon by Py-GCMS indicated the presence of low relative amounts of n-alkanes. However, 13C-NMR data suggested that a significantportion of the phytolith-occluded material was composed of simple carbohydrates (O-alkyl carbon) and that alkyl carbon (lipid material) constituted a minor fraction.These isotopic and spectroscopic data have important implications for the calculation of the proportions of C3- versus C4-derived charred organic matter in modern as well as geological studies.

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