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    Author(s): Mark Poth; Iris Cofman Anderson; Heloisa Sinatora Miranda; Antonia Carlos Miranda; Philip J. Riggan
    Date: 1995
    Source: Global Biogeochemical Cycles. 9(4): 503-513
    Publication Series: Scientific Journal (JRNL)
    PDF: View PDF  (742.69 KB)

    Description

    Among all global ecosystems, tropical savannas are the most severely and extensively affected by anthropogenic burning. Frequency of fire in cerrado, a type of tropical savanna covering 25% of Brazil, is 2 to 4 years. In 1992 we measured soil fluxes of NO, N20, CH4, and C02 from cerrado sites that had been burned within the previous 2 days, 30 days, I year, and from a control site last burned in 1976. NO and N20 fluxes responded dramatically to fire with the highest fluxes observed from newly burned soils after addition of water. Emissions of N-trace gases after burning were of similar magnitude to estimated emissions during combustion. NO fluxes immediately after burning are among the highest observed for any ecosystem studied to date. These rates declined with time after burning and had returned to control levels 1 year after the bum. An assessment of our data suggested that tropical savanna, burned or unburned, is a major source of NO to the troposphere. Cerrado appeared to be a minor source of N20 and a sink for atmospheric CH4. Burning also elevated C02 fluxes, which remained detectably elevated 1 year later.

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    Citation

    Poth, Mark; Anderson, Iris Cofman; Miranda, Heloisa Sinatora; Miranda, Antonia Carlos; Riggan, Philip J. 1995. The magnitude and persistence of soil NO, N20, CH4, and C02 fluxes from burned tropical savanna in Brazil. Global Biogeochemical Cycles. 9(4): 503-513.

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