HR: 11:05h
AN: B32B-04    [Abstracts]
TI: What is the seasonality of photosynthesis across the Amazon basin?: a cross-site analysis of eddy flux tower measurements from BrasilFlux network
AU: * Restrepo-Coupe, N
EM: ncoupe@email.arizona.edu
AF: Dept. of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States
AU: Saleska, S R
EM: saleska@email.arizona.edu
AF: Dept. of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States
AU: da Rocha, H
EM: humberto@model.iag.usp.br
AF: Dept of Atmospheric Sciences, Universidade de São Paulo, São Paulo, SP 05508-900, Brazil
AU: Christoffersen, B
EM: bchristo@email.arizona.edu
AF: Dept. of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States
AU: da Araujo, A C
EM: alessandro.araujo@falw.vu.nl
AF: Alterra, Wageningen University and Research Centre, Wageningen, 6700, Netherlands
AU: Borma, L S
EM: laura@uft.edu.br
AF: Universidade Federal do Universidade Federal do Tocantins, Universidade Federal do Tocantins, Palmas, TO 77020, Brazil
AU: Cardoso, F L
EM: cardoso@unir.br
AF: Fundação Universidade Federal de Rondonia, Fundação Universidade Federal de Rondonia, Ji-Parana, RO 78900, Brazil
AU: Hutyra, L R
EM: lrhutyra@u.washington.edu
AF: University of Washington, University of Washington, Seattle, WA 98195,
AU: Kruijt, B
EM: Bart.Kruijt@wur.nl
AF: Alterra, Wageningen University and Research Centre, Wageningen, 6700, Netherlands
AU: Manzi, A O
EM: manzi@inpa.gov.br
AF: Instituto Nacional de Pesquisas da Amazônia (INPA), Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, AM 69060, Brazil
AU: Nobre, A D
EM: anobre@ltid.inpe.br
AF: Instituto Nacional de Pesquisas da Amazônia (INPA), Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, AM 69060, Brazil
AU: von Randow, C
EM: cvrandow@gmail.com
AF: Alterra, Wageningen University and Research Centre, Wageningen, 6700, Netherlands
AU: Sá, L K
EM: leodeane@uol.com.br
AF: National Institute for Space Research (INPE), National Institute for Space Research (INPE), Belem, PA 69060, Brazil
AU: Sakai, R
EM: sakai@asrc.cestm.albany.edu
AF: Atmospheric Sciences Research Center, State University of New York, Albany, NY 12222, United States
AU: Tota, J
EM: tota@inpa.gov.br
AF: Instituto Nacional de Pesquisas da Amazônia (INPA), Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, AM 69060, Brazil
AU: ., .
AB: Amazonian forests play an important and complex role in the global carbon cycle, contributing substantially to increases (via land use change emissions) and possibly to net sequestration (in intact forests) of atmospheric CO₂. Predicting these processes of net carbon uptake and release depends crucially on understanding ecosystem response to both seasonal and interannual variations. To better understand these discrepancies, we investigated the seasonal and spatial patterns of Amazonian forest photosynthetic activity, and the effects of land-use conversion thereon, by integrating data from a network of ground-based eddy flux towers in Brazil (the new "BrasilFlux" network). These flux towers, a legacy of the ‘Large- Scale Biosphere Atmosphere Experiment in Amazonia' (LBA) project, have now produced multi-year datasets. The pattern of photosynthesis at towers across the central Amazon (5°N-5°S) shows little evidence of seasonal water limitation, as they all sustain high -- or even increasing -- levels of GEP as the dry season progresses. Towers along the southern flank of the Amazon, in converted pasture sites, and in savanna, by contrast, exhibit seasonal patterns consistent with varying degrees of water stress.
DE: 0438 Diel, seasonal, and annual cycles (4227)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting