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Above-ground biomass (live+dead), was estimated pre- and post-burn in eight types of savanna ecosystem in Roraima, in the extreme northern part of the Brazilian Amazon. The objective was to investigate the stock of pre-burn above-ground carbon and its fate after experimental fires that were set during the dry season (December–March). The total biomass in each ecosystem was divided into two groups (“fine-fuels” and “trees and shrubs”), and the combustion factor and the concentration of carbon were determined for of each of the biomass components within these groups. The ecosystems with the lowest biomasses were the grasslands (1627–4045kgha⁻¹), followed by parkland (6127–8038kgha⁻¹) and open woodland savanna (10,246–11,731kgha⁻¹). The percentage of “live biomass” was higher in the open woodland vegetation types (77.1–85.6%), and lower in the grassland and parkland types (11.4–51.4 …