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O sistema agroflorestal da bracatinga utiliza queima apos o corte e retirada da madeira, dando lugar a semeadura de especies agricolas. A queima controlada altera a temperatura do ar e do solo. A mudanca de refletividade da superficie e mais rapida que dos reflorestamentos proximos. A transformacao das folhas e galhos secos em cinza apos a queima, faz com que haja mudancas do albedo, alterando o balanco energetico. Os resultados mostram temperaturas do ar de 600oC por 20-40 segundos a 1 cm do solo e de 100 a 300°C a 60 e 160cm do solo, respectivamente, durante 1 minuto. Temperaturas de 100oC ao nivel do solo residiram por mais de 3 minutos. A temperatura do solo nao foi afetada a 2,5cm de profundidade. Durante a queima, a temperatura se elevou em 1oC. O albedo de 0,24 antes da queima, passou para 0,21 logo apos a queima. Apos 60 dias, o albedo voltou a 0,24 devido a recomposicao da vegetacao. FIRE EFECTS ON SOME MICROMETEOROLOGICAL VARIABLES IN A BRACATINGA (Mimosa scabrella, Benth.) FOREST, COLOMBO, PR Abstract The bracatinga agriculture-forest systems adopted by farmers consists on burning the residues after woods harvesting prior to sowing the crops. This procedure is repeated each 6 to 8 years in the same area. The prescribed burning changes air and soil temperatures. Changes in reflectivity are faster then in the surrounding forest areas. Transforming leaves and branches into ashes after burning changes the albedo of the surface, altering the energetic balance. Results showed air temperatures of 600°C during 20 to 40 seconds, 1cm above the soil surface, and 100 to 300°C at 60 and 160cm above the soil surface, during 1 minute. Temperatures over 100°C on the soil surface were observed for more than 3 minutes. Soil temperature was not affected at 2.5cm depth; during burning, the temperature raised only 1oC. The surface albedo that was 0,24 before the burning changed to 0,21 after burning and returned to 0.24 sixty days after the burning due to the vegetation regeneration.

EFEITOS DO FOGO SOBRE ALGUMAS VARIÁVEIS MICROMETEOROLÓGICAS EM UMA FLORESTA DE BRACATINGA (Mimosa scabrella, Benth.), NO MUNICÍPIO DE COLOMBO, PR