Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/9372
Title: Evasion of CO2 and dissolved carbon in river waters of three small catchments in an area occupied by small family farms in the eastern Amazon
Other Titles: Evasão de CO2 e carbono dissolvido em águas fluviais de três pequenas bacias em área ocupada por pequenas propriedades de agricultores familiares na Amazônia oriental
metadata.dc.creator: FIGUEIREDO, Ricardo de Oliveira
MARKEWITZ, Daniel
KRUSCHE, Alex Vladimir
COSTA, Fabíola Fernandes
GERHARD, Pedro
ROSA, Maria Beatriz Silva da
Keywords: Bacia amazônica
Biogeoquímica
Evasão de dióxido de carbono
Issue Date: Aug-2017
Publisher: Universidade Federal do Pará
Citation: ROSA, Maria Beatriz Silva da et al. Evasion of CO2 and dissolved carbon in river waters of three small catchments in an area occupied by small family farms in the eastern Amazon. Revista Ambiente e Água, Taubaté, v. 12, n. 4, p. 556-574, ago. 2017. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/9372>. Acesso em:.
Abstract: CO2 effluxes from streams and rivers have been hypothesized to be a critical pathway of carbon flow from the biosphere back to the atmosphere. This study was conducted in three small Amazonian catchments to evaluate carbon evasion and dynamics, where land-use change has occurred on small family-farms. Monthly field campaigns were conducted from June 2006 to May 2007 in the Cumaru (CM), Pachibá (PB) and São João (SJ) streams. Electrical conductivity, pH, temperature, and dissolved oxygen measurements were done in situ, while water samples were collected to determine dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) concentrations, as well as carbon dioxide partial pressures (pCO2) and CO2 evasion fluxes. Instantaneous discharge measured by a current meter was used to calculate DOC fluxes. Considering all the sites, DOC, DIC, pCO2, and CO2 flux measurements ranged as follows, respectively: 0.27 - 12.13 mg L-1; 3.5 - 38.9 mg L-1; 2,265 - 26,974 ppm; and 3.39 - 75.35 μmol m-2 s-1. DOC annual flux estimates for CM, SJ and PB were, respectively, 281, 245, and 169 kg C ha-1. CO2 evasion fluxes had an average of 22.70 ± 1.67 μmol m-2 s-1. These CO2 evasion fluxes per unit area were similar to those measured for major Amazonian rivers, thus confirming our hypothesis that small streams can evade substantial quantities of CO2. As secondary vegetation is abundant as a result of family farming management in the region, we conclude that this vegetation can be a major driver of an abundant carbon cycle.
URI: http://repositorio.ufpa.br/jspui/handle/2011/9372
ISSN: 1980-993X
Appears in Collections:Artigos Científicos - IG

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