HR: 09:45h
AN: B51E-06    [Abstracts]
TI: Lessons from compound specific turnover of soil organic matter using 2H, 13C and 14C
AU: * Gleixner, G
EM: gerd.gleixner@bgc-jena.mpg.de
AF: MPI Biogeochemistry, POBox 100164, Jena, 07701 Germany
AU: Kramer, C
EM: christiane.kramer@bgc-jena.mpg.de
AF: MPI Biogeochemistry, POBox 100164, Jena, 07701 Germany
AU: Andrej, T
EM: andrej.thiele@bgc-jena.mpg.de
AF: MPI Biogeochemistry, POBox 100164, Jena, 07701 Germany
AB: Compound specific stable and radioactive isotopes at their natural abundance level are used to understand sources and processes involved in the formation of soil organic matter. Bulk 13C values of soil organic matter from time series and depth profile give first hints on the turnover of soil carbon. However, only isotope values of single compounds give the opportunity to understand the processes of soil carbon formation. Therefore, compound specific turnover times (13C and 14C) are calculated from the shift of carbon isotopes in labile and recalcitrant biomarkers extracted from soil after vegetation change. Additionally, for the first time we present compound specific turnover times of these biomarkers using Deuterium. Results from three different experimental sites offer a new insight of soil carbon formation and stabilization.
UR: http://www.bgc-jena.mpg.de
DE: 1694 Instruments and techniques
DE: 1615 Biogeochemical processes (4805)
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting