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EnglishLocal greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembe, State of Sao Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4 ) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.51 kg CHha-1 dia-1), the partial global warming potential (pGWP, 27.2 Mg CO2 eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2 eq kg-1 grain). portuguesEstudos locais de mensuracao de fluxos de gases de efeito estufa em sistemas agricolas tem sido incentivados a nivel global como base para subsidiar estimativas nacionais e estaduais de emissao. Este estudo objetivou quantificar a emissao sazonal de metano (CH4) em cultivo de arroz irrigado, sob sistema pre-germinado, no municipio de Tremembe, Estado de Sao Paulo, na safra de 2008/2009, utilizando o metodo de câmara estatica e cromatografia gasosa. O estudo mostrou elevada emissao sazonal de CH4 para a area estudada, em funcao, provavelmente do longo periodo de inundacao. Foi estimado o fator de emissao de CH4 (6,51 kg CH4ha-1 dia-1), o potencial de aquecimento global parcial (PAGp, 27,2 Mg CO2 eq estacao de crescimento-1 ha-1) e o PAGp escalonado pelo rendimento (R) de graos (PAGpR, 3,9 kg CO2 eq kg-1 grao).

Methane emission from a flooded rice field under pre-germinated system