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A liberacao de dioxido de carbono (CO 2 ) do solo para a atmosfera e denominado “efluxo de CO 2 do solo”, sendo uma fonte importante para o aumento de gases do efeito estufa. O principal objetivo desse trabalho e avaliar as diferentes emissoes de CO 2 para um sistema de rotacao de cultura soja/arroz alagado, em cinco tratamentos distintos de manejo do solo realizado na Regiao agroecologica das Grandes Lagoas do Rio Grande do Sul, no campo experimental da Estacao Experimental Terras Baixas da Embrapa Clima Temperadas, a fim de quantificar essas emissoes sobre diferentes condicoes de temperatura do solo e temperatura do ar. Para realizar este trabalho, foram utilizados dados de cinco tratamentos em cultura de arroz alagado para se determinar a concentracao de CO 2 emitidos pelo solo e pela cultura de arroz irrigado em sistema de rotacao de cultura. Os dados de concentracao de CO 2 foram coletados sempre da mesma maneira para os anos de 2013-2014, atraves do metodo da câmara estatica fechada. A emissao de CO 2 da cultura de arroz irrigado apresentou uma relacao bem definida com a temperatura do solo e a temperatura do ar, sendo provavelmente as principais controladoras da emissao de CO 2 da cultura. O manejo do solo mostrou-se forte influenciador das emissoes de CO 2 da cultura de arroz, porem sao necessarios mais estudos para verificar a real influencia dessa pratica. A B S T R A C T The release of carbon dioxide (CO 2 ) from the soil to the atmosphere is called ";;soil CO 2 efflux";;, being an important source for the increase in greenhouse gases. The aim of this study is to evaluate the difference of CO 2 emissions for a soybean / rice paddy rotation system in five different soil management treatments. These treatments were performed at the agro- ecological region of the Grandes Lagoas of Rio Grande do Sul, in the experimental field of the Experimental Station of Embrapa Clima Temperado, in order to quantify these emissions on different conditions, such as soil and air temperatures. To accomplish this work, data were used in five different treatments of flooded rice culture to determine the concentration of CO 2 emitted by the soybean / rice paddy rotation system. The CO 2 concentration data were collected in the same way for the year 2013- 2014, through the method of static closed chamber. The release of CO 2 from the flooded rice crop had a well-defined relation with the soil and air temperature, being probably the main controller of the CO 2 emission of the crop. Soil management has been showing a very well influence on the CO 2 emissions of the rice crop, but more studies need to be done to verify the real influence of this practice. Keywords: greenhouse effect; soil management; culture rotation. Normal 0 21 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";}

Emissão de CO2 em culturas de soja e arroz irrigado - Safra 2013/2014 - RS (CO2 emission in soybean cultures and irrigated rice – Crop 2013/2014 - RS)