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Carbon isotope anomaly in the major plant C-1 pool and its global biogeochemical implications

Keppler, F. and Kalin, R. and Harper, DB and McRoberts, WC and Hamilton, JTG (2004) Carbon isotope anomaly in the major plant C-1 pool and its global biogeochemical implications. Biogeosciences, 1 (2). pp. 123-131.

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    Abstract

    We report that the most abundant C-1 units of terrestrial plants, the methoxyl groups of pectin and lignin, have a unique carbon isotope signature exceptionally depleted in C-13. Plant-derived C-1 volatile organic compounds (VOCs) are also anomalously depleted in C-13 compared with Cn+1 VOCs. The results confirm that the plant methoxyl pool is the predominant source of biospheric C-1 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.

    Item type: Article
    ID code: 16238
    Keywords: volatile organic compounds, oxidation, emmissions, chloromethane , fractionation, Agriculture (General), Ecology, Evolution, Behavior and Systematics, Earth-Surface Processes
    Subjects: Agriculture > Agriculture (General)
    Department: Faculty of Engineering > Civil and Environmental Engineering
    Related URLs:
      Depositing user: Prof Robert M Kalin
      Date Deposited: 11 Apr 2011 13:35
      Last modified: 05 Sep 2014 13:08
      URI: http://strathprints.strath.ac.uk/id/eprint/16238

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