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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L13608,
4 PP., 2005
doi:10.1029/2005GL023133
Changes in chemical and isotopic signatures of plant materials during degradation: Implication for assessing various organic inputs in estuarine systems
Department of Marine Sciences, University of Georgia, Athens, Georgia, USA
Department of Marine Sciences, University of Georgia, Athens, Georgia, USA
Center for Applied Isotope Study, University of Georgia, Athens, Georgia, USA
Center for Applied Isotope Study, University of Georgia, Athens, Georgia, USA
To evaluate applicability of the end-member mixing model in assessment of input and transport of organic carbon in estuarine systems, we incubated marine diatom, land grass, and salt marsh plant in Altamaha estuarine water for two months. Chemical and isotopic parameters (bulk organic carbon/nitrogen contents, lipid compositions, stable C/N isotopes, and lipid stable carbon isotopic ratios) were analyzed for fresh and degraded materials. The results showed that although the C/N and δ15N ratios of three materials varied similarly during degradation, the bulk δ13C, lipid compositions, and lipid stable carbon isotopic compositions varied differently from material to material and from compound to compound, implying that applications of the end-member model should consider the diagenetic status of organic materials and the potential changes in chemical and isotopic signatures.
Received 1 April 2005; accepted 10 June 2005; published 14 July 2005.
Citation: (2005), Changes in chemical and isotopic signatures of plant materials during degradation: Implication for assessing various organic inputs in estuarine systems, Geophys. Res. Lett., 32, L13608, doi:10.1029/2005GL023133.
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