HR: 1340h
AN: B13C-0239 [Abstracts]
TI: Tracing C Fluxes From Leaf Litter To Microbial Respired CO2 And Specific Soil Compounds
AU: * Rubino, M
EM: mauro.rubino@unina2.it
AF: Department of Environmental Science, Second University of Naples, 81100 Caserta, via Vivaldi, 43,
Caserta, 81100
Italy
AU: Lubritto, C
EM: carmine.lubritto@unina2.it
AF: Department of Environmental Science, Second University of Naples, 81100 Caserta, via Vivaldi, 43,
Caserta, 81100
Italy
AU: D'Onofrio, A
EM: antonio.donofrio@unina2.it
AF: Department of Environmental Science, Second University of Naples, 81100 Caserta, via Vivaldi, 43,
Caserta, 81100
Italy
AU: Gleixner, G
EM: gerd.gleixner@bgc-jena.mpg.de
AF: Max Planck Institute for Biogeochemistry, Winzerlaer strasse, 10, Jena, 07745
Germany
AU: Terrasi, F
EM: filippo.terrasi@unina2.it
AF: Department of Environmental Science, Second University of Naples, 81100 Caserta, via Vivaldi, 43,
Caserta, 81100
Italy
AU: Cotrufo, F M
EM: mfrancesca.cotrufo@unina2.it
AF: Department of Environmental Science, Second University of Naples, 81100 Caserta, via Vivaldi, 43,
Caserta, 81100
Italy
AB:
Despite litter decomposition is one of the major process controlling soil C stores and nutrient cycling, yet C dynamics
during litter decay are poorly understood and quantified. Here we report the results of a laboratory experiment where 13C
depleted leaf litter was incubated on a 13C enriched soil with the aims to: i) partition the C loss during litter decay into
microbial respired-CO2 and C input into the soil; ii) identify the soil compounds where litter derived C is retained; iii)
assess whether litter quality is a determinant of both the above processes.
Three 13C-depleted leaf litter(delta13C ca. -43), differing in their degradability, were incubated on C4 soil (delta13C ca.
-18) under laboratory controlled conditions for 8 months, with litter respiration and delta13C-CO2 being measured at regular
intervals. At harvest, Compound Specific Isotope Analyses was performed on soil and litter samples in order to follow the
fate of litter-derived C compounds in the various pools of SOMŸn The delta13C of soils carbohydrates, alkanes and Phospho
Lipids Fatty Acids (PLFA) were measured, and the mixing model approach used to quantify the contribution of litter derived C
to the specific compounds.
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting