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)
DOI:
https://doi.org/10.26848/rbgf.v10.4.p1071-1078Keywords:
efeito estufa, manejo do solo, rotação de culturaAbstract
A liberação de dióxido de carbono (CO2) do solo para a atmosfera é denominado “efluxo de CO2 do solo”, sendo uma fonte importante para o aumento de gases do efeito estufa. O principal objetivo desse trabalho é avaliar as diferentes emissões de CO2 para um sistema de rotação de cultura soja/arroz alagado, em cinco tratamentos distintos de manejo do solo realizado na Região agroecológica das Grandes Lagoas do Rio Grande do Sul, no campo experimental da Estação Experimental Terras Baixas da Embrapa Clima Temperadas, a fim de quantificar essas emissões sobre diferentes condições 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 concentração de CO2 emitidos pelo solo e pela cultura de arroz irrigado em sistema de rotação de cultura. Os dados de concentração de CO2 foram coletados sempre da mesma maneira para os anos de 2013-2014, através do método da câmara estática fechada. A emissão de CO2 da cultura de arroz irrigado apresentou uma relação bem definida com a temperatura do solo e a temperatura do ar, sendo provavelmente as principais controladoras da emissão de CO2 da cultura. O manejo do solo mostrou-se forte influenciador das emissões de CO2 da cultura de arroz, porém são necessários mais estudos para verificar a real influência dessa prática.
A B S T R A C T
The release of carbon dioxide (CO2) from the soil to the atmosphere is called ";;soil CO2 efflux";;, being an important source for the increase in greenhouse gases. The aim of this study is to evaluate the difference of CO2 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 CO2 emitted by the soybean / rice paddy rotation system. The CO2 concentration data were collected in the same way for the year 2013- 2014, through the method of static closed chamber. The release of CO2 from the flooded rice crop had a well-defined relation with the soil and air temperature, being probably the main controller of the CO2 emission of the crop. Soil management has been showing a very well influence on the CO2 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.
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Copyright (c) 2017 Gustavo Colepícolo Monteiro, Graciela Redies Fischer, Leonardo José Gonçalves Aguiar, Walkyria Bueno Scivittaro, Lucas Fernando Carvalho da Conceição
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