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In last years, the damage caused to the environment due to anthropic activities have become a worldwide concern. The carbon dioxide (CO 2 ) is one of the main greenhouse gases because the increase of its concentration in the atmosphere has intensified to global warming. Therefore, to study the CO 2 amounts emitted to the atmosphere has been even more important, especially in agricultural areas in Brazil. This study aimed to determine the spatial variability of soil CO 2 emissions (FCO 2 ), soil temperature (Ts) and soil moisture (Ms) in soybean and sugarcane cultivation areas in the Cerrado region in Mato Grosso do Sul. The FCO 2 and Ts registration were done using a portable flow chamber and temperature sensor of the LI-8100 system. The Ms was evaluated using TDR portable system. The studies were conducted in the years of 2013, in soybean cultivation, and in 2014, in the sugarcane cultivation, during the crop growth early stages, using grids which contain 89 and 102 sampling points, respectively, spanning 1 ha area in both experiments. The spatial variability variables were characterised by geostatistics: mathematical models adjustments to the experimental variograms and spatial pattern maps construction through ordinary kriging technique. The sTe sH variables did not show significant correlations with FCO 2 . Despite the years of conducting the experiments, the soybean cultivation presented the higher average values of soil CO 2 emission equal 2.11 µmol m -2 s -1 and higher variation in range of the spatial dependency between 8.41 and 27 m when compared to sugarcane culture, with a FCO 2 average of 1.71 µmol m -2 s -1 and variation in the ranges of spatial dependency between 15.3 and 27.3 m. Key words : geostatistics, soil respiration, soil attributes, agricultural management. VARIABILIDADE ESPACIAL DA EMISSAO DE CO2 DO SOLO EM AREAS DE SOJA E CANA-DE-ACURCAR NO CERRADO MATO GROSSO DO SUL, BRASIL RESUMO: Nos ultimos anos, os danos gerados ao meio-ambiente devido as acoes antropicas se tornaram uma preocupacao mundial. O dioxido de carbono (CO 2 ) e um dos principais gases estufas, pois o aumento de sua concentracao na atmosfera terrestre tem intensificado o aquecimento global. Portanto, estudar as quantidades de CO 2 emitido para a atmosfera tem sido cada vez mais importante, principalmente em areas agricolas no Brasil. O objetivo do trabalho foi determinar a variabilidade espacial da emissao de CO 2 (FCO2), temperatura (Ts) e umidade (Us) do solo em areas de cultivo de soja e cana-de-acucar na regiao do Cerrado no Mato Grosso do Sul. FCO2 e Ts foram registradas utilizando-se de câmara de fluxo portatil e sensor de temperatura do sistema LI-8100. A umidade foi avaliada utilizando sistema portatil TDR. Os estudos foram conduzidos nos anos de 2013, na cultura da soja, e no ano de 2014, na cultura da cana-de-acucar, durante os estagios inicias do crescimento das culturas, utilizando-se gradeados de contendo 89 e 102 pontos amostrais, respectivamente, abrangendo area de 1 ha nos dois experimentos. A variabilidade espacial das variaveis foi caracteriza pela geoestatistica, ajustes de modelos matematicos aos variogramas experimentais e construcao dos mapas de padrao espacial por meio da tecnica de krigagem ordinaria. A variaveis Ts e Us nao apresentaram correlacoes significativas com FCO2.A despeito dos anos de conducao dos experimentos, a cultura da soja os maiores valores de media de emissao de CO 2 do solo igual 2,11 µmol m -2 s -1 e maior variacao nos alcances de dependencia entre 8,41 e 27 m quando comparados a cultura de cana-de-acucar com media de 1,71 µmol m -2 s -1 e variacao nos valores de alcance entre 15,3 e 27,3 m. Palavras-chave: geoestatistica, respiracao do solo, atributos do solo, manejo agricola.

SPATIAL VARIABILITY OF SOIL CO2 EMISSION IN SOYBEAN AND SUGARCANE AREAS IN MATO GROSSO DO SUL CERRADO, BRAZIL