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Assessing Brazil carbon budget. 2. Biotic fluxes and net carbon balance |
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AbstractThe global carbon cycle is affected by the annual addition of 7.0 x 10(9) Mg CO2-C to the atmosphere from deforestation and burning of fossil fuels. Because of its large area of high C density forests and high deforestation rate, Brazil may play an important role in the global C cycle. The study reported here developed an annual C budget for Brazil for the year 1990. The budget was based on a simple conceptual model of ecosystem C storage and flux, a newly developed vegetation map based on remote sensing data, and published information on carbon densities and flux parameters. The analysis presents an estimate of net anthropogenic flux from land use change and includes an estimate of C accumulation in secondary forests. Net CO2-C emission estimates ranged from 174 X 10(6) to 233 X 10(6) Mg C year(-1). Timber harvest in plantations and burning fossil fuels contributed additional emissions of about 107 X 10(6) Mg C year(-1). Brazil's combined net C emissions represented 4-5% of the global total
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