HR: 17:30h
AN: B14B-07    [Abstracts]
TI: Use of d13C for soil CO2 efflux partitioning in a beech temperate forest and a rain tropical forest
AU: * Longdoz, B
EM: longdoz@nancy.inra.fr
AF: UMR Ecologie et Ecophysiologie Forestiere, Centre INRA de Nancy Route d'Amance, Champenoux, 54 54280 France
AU: Epron, D
EM: Daniel.Epron@scbiol.uhp-nancy.fr
AF: UMR Ecologie et Ecophysiologie Forestiere, Universite Henri Poincare, Nancy 1 Faculte des Sciences BP 239, Vandoeuvre les Nancy, 54 54506 France
AU: Ngao, J
EM: ngao@nancy.inra.fr
AF: UMR Ecologie et Ecophysiologie Forestiere, Centre INRA de Nancy Route d'Amance, Champenoux, 54 54280 France
AU: Ponton, S
EM: ponton@popkru.cirad.fr
AF: UMR Ecologie des Forets de Guyane, Campus Agronomique Centre INRA de Kourou BP 709, Kourou, 97 97379 France
AU: Bonal, D
EM: damien.bonal@kourou.cirad.fr
AF: UMR Ecologie des Forets de Guyane, Campus Agronomique Centre INRA de Kourou BP 709, Kourou, 97 97379 France
AU: Le Dantec, V
EM: Valerie.ledantec@cesbio.cnes.fr
AF: Centre d'Etudes Spatiales de la BIOsphere (CESBIO), 18 avenue Edouard Belin BPI 2801 Cedex 09, Toulouse, 31 31401 France
AB: Carbon isotopic signature has been measured at the different stages of the soil CO2 efflux production in trenched and control plots to improve the knowledge about the physical and biochemical processes of the soil respiration. All the measurements of d13C have been performed using a mass-spectrometer. We have compared the isotopic signatures of the CO2 going out of the soil, the CO2 of the soil atmosphere, the organic carbon in the material that could be considered as the main soil respiration sources (live and dead roots, soil organic matter, aerial litter) and the CO2 produced by these sources in incubation jars. The aims of this study were to evaluate the possibilities to combine these different data sets to estimate the partitioning of soil respiration between its autotrophic and heterotrophic components, and to get more insight into potential fractionation during biochemical or diffusion processes. Measurements were conducted in a beech forest located at Hesse in the North East of France (site equipped with a flux tower and belonging to the CarboEurope network) and in a neotropical primary rainforest located at Paracou (French Guiana). Preliminary results show first a very tenuous difference between CO2 isotopic signatures of efflux coming from the trenched and control plots and, secondly, d13C significant divergences between bulk organic material and CO2 produced in the corresponding incubation jars. Our ability to use this kind of data for partitioning soil respiration into its main components will be discussed.
DE: 0428 Carbon cycling (4806)
DE: 0454 Isotopic composition and chemistry (1041, 4870)
DE: 0476 Plant ecology (1851)
SC: Biogeosciences [B]
MN: Fall Meeting 2005