HR: 09:15h
AN: B51F-06    [Abstracts]
TI: Methane Evasion and Carbon Dynamics on the Amazon Floodplain
AU: * Melack, J M
EM: melack@bren.ucsb.edu
AF: John Melack, Bren School, University of California, Santa Barbara, CA 93106,
AB: The fringing floodplain along the 2600 km reach of the Amazon River in Brazil inundates up to about 80,000 km squared of flooded forests, open water and floating macrophytes. These habitats outgas significant amount of carbon dioxide and methane as a result of autochthonous and allochthonous fixation and exchanges of carbon on the floodplain and with the neighboring uplands. Based on our measurements and those of others, we have assembled sufficient data to characterize the following fluxes and transformations in a representative central Amazon floodplain lake: inputs of litterfall, dissolved organic carbon (DOC) in rainfall, DOC and particulate organic carbon (POC) in streams, DOC in groundwater seepage; exchanges of DOC and POC with the mainstem river; net primary productivity of floating macrophyes, periphyton and phytoplankton; sedimentation; carbon dioxide and methane evasion. These data are the basis for models of carbon processing and methane evasion.
DE: 1890 Wetlands (0497)
DE: 4802 Anoxic environments (0404, 1803, 4834, 4902)
DE: 4806 Carbon cycling (0428)
DE: 4815 Ecosystems, structure, dynamics, and modeling (0439)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting