Artículos de revistas
Soil-atmosphere Exchange Of Nitrous Oxide, Methane And Carbon Dioxide In A Gradient Of Elevation In The Coastal Brazilian Atlantic Forest
Registro en:
Biogeosciences. , v. 8, n. 3, p. 733 - 742, 2011.
17264170
10.5194/bg-8-733-2011
2-s2.0-79953011913
Autor
Sousa Neto E.
Carmo J.B.
Keller M.
Martins S.C.
Alves L.F.
Vieira S.A.
Piccolo M.C.
Camargo P.
Couto H.T.Z.
Joly C.A.
Martinelli L.A.
Institución
Resumen
Soils of tropical forests are important to the global budgets of greenhouse gases. The Brazilian Atlantic Forest is the second largest tropical moist forest area of South America, after the vast Amazonian domain. This study aimed to investigate the emissions of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) fluxes along an altitudinal transect and the relation between these fluxes and other climatic, edaphic and biological variables (temperature, fine roots, litterfall, and soil moisture). Annual means of N2O flux were 3.9 (± 0.4), 1.0 (± 0.1), and 0.9 (± 0.2) ng N cm-2 h-1 at altitudes 100, 400, and 1000 m, respectively. On an annual basis, soils consumed CH4 at all altitudes with annual means of -1.0 (± 0.2), -1.8 (± 0.3), and -1.6 (± 0.1) mg m-2 d-1 at 100 m, 400 m and 1000 m, respectively. Estimated mean annual fluxes of CO2 were 3.5, 3.6, and 3.4 μmol m-2 s-1 at altitudes 100, 400 and 1000 m, respectively. N2O fluxes were significantly influenced by soil moisture and temperature. Soil-atmosphere exchange of CH4 responded to changes in soil moisture. Carbon dioxide emissions were strongly influenced by soil temperature. While the temperature gradient observed at our sites is only an imperfect proxy for climatic warming, our results suggest that an increase in air and soil temperatures may result in increases in decomposition rates and gross inorganic nitrogen fluxes that could support consequent increases in soil N2O and CO2 emissions and soil CH4 consumption. 8 3 733 742 Alves, L.F., Vieira, S.A., Scaranello, M.A., Camargo, P.B., Santos, F.A.M., Joly, C.A., Martinelli, L.A., Forest structure and live aboveground biomass variation along an elevational gradient of tropical moist forest (Brazil) (2010) Forest Ecol. Manage., 260, pp. 679-691 Arnold, J., Corre, M.D., Veldkamp, E., Soil N cycling in oldgrowth forests across an Andosol toposequence in Ecuador (2009) Forest Ecol. 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