@InProceedings{SaleskaMuMaDaKiCaWo:2002:CaBaSe,
               author = "Saleska, Scott R. and Munger, William and Matross, Daniel M. and 
                         Dauber, Bruce C. and Kirchhoff, Volker Walter Johann Heinrich and 
                         Camargo, Plinio B. de and Wofsy, Steven C.",
                title = "Carbon balance and seasonal patterns via eddy covariance 
                         measurements in an old-growth Amazon forest",
                 year = "2002",
         organization = "International LBA Scientific Conference, 2.",
             keywords = "GEOF{\'{\I}}SICA.",
             abstract = "To assess the role of Amazon forests as a source or a sink for 
                         atmospheric CO2, we used groundbased biometry measurements 
                         together with whole-system CO2 fluxes (via eddy covariance)to 
                         explore the ecological and climatic controls on the carbon balance 
                         at an old-growth Amazon forest (Tapajos National Forest, Santarem, 
                         Para, Brazil). The initial year (April 2001 - April 2002)of eddy 
                         covariance measurements suggest that the forest was a modest 
                         source to the atmosphere during this period (net ecosystem 
                         exchange, NEE = +0.9 Mg C ha-1 yr-1 to the atmosphere, after 
                         correcting for {"}lost flux{"} during periods of weak mixing when 
                         friction velocity was <0.2 m/sec). The magnitude of this 
                         correction was significant (+ 1.6 Mg C ha-1 yr-1)but not as large 
                         as at many sites, and even without it the forest would be close to 
                         carbon balance, with an NEE of -0.7 Mg C ha-1 yr-1. The corrected 
                         NEE estimate was consistent with the biometry-based estimate of 
                         fluxes from aboveground biomass (0.3 to 4.0 Mg C ha-1 yr-1)during 
                         an overlapping two-year period (July 1999 - July 2001). There was 
                         marked seasonal variation in NEE that was opposite in phase to 
                         what would have been predicted from tree growth rates alone: net 
                         ecosystem loss to the atmosphere was observed during the rainy 
                         season (January-May), even though wood increment was high during 
                         this period; and conversely, net ecosystem uptake was observed in 
                         the dry season (August-November)when wood increment was generally 
                         low. These patterns appear to be explained by variations in 
                         ecosystem respiration losses, which were strongly reduced during 
                         the dry season, presumably due to drier soil and litter layer. 
                         These results are in contrast to the large uptake and lack of 
                         seasonality reported for a site near Manaus, and to the nearly 
                         opposite seasonal pattern observed in a southeastern Amazon 
                         transitional tropical forest (cerrad{\~a}o)in Mato Grosso, which 
                         gained carbon in the rainy season and became carbon-neutral in the 
                         dry season.",
  conference-location = "Manaus, Br",
      conference-year = "7-10 July 2002",
                label = "10229",
           targetfile = "saleska.pdf",
        urlaccessdate = "27 abr. 2024"
}