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Type: Artigo de periódico
Title: Soil Co 2 Emission Of Sugarcane Fields As Affected By Topography
Author: De Figueiredo Brito L.
Marques Jr. J.
Pereira G.T.
Souza Z.M.
La Scala Junior N.
Abstract: The spatial and temporal variation of soil CO 2 emission is influenced by several soil attributes related to CO 2 production and its diffusion in the soil. However, few studies aiming to understand the effect of topography on the variability of CO 2 emissions exist, especially for cropping areas of tropical regions. The objective of this study was to evaluate the spatial and temporal changes of soil CO 2 emission and its relation to soil attributes in an area currently cropped with sugarcane under different relief forms and slope positions. Mean CO 2 emissions in the studied period (seven months) varied between 0.23 and 0.71, 0.27 and 0.90, and 0.31 and 0.80 g m -2 h -1 of CO 2 for concave (Cone), backslope (BackS) and footslope (FootS) positions, respectively. The temporal variability of CO 2 emissions in each area was explained by an exponential relation between the CO 2 emission and soil temperature and a linear relation between CO 2 emission and soil water content. The Q 10 values were 1.98 (± 0.34), 1.81 (± 0.49) and 1.71 (± 0.31) for Conc, BackS and FootS, respectively. Bulk density, macroporosity, penetration resistance, aggregation and oxidizable organic carbon content explain the changes in soil CO 2 emission observed, especially when the Cone position was compared to BackS. The effect of relief form and topographic position on soil CO 2 emission variation was dependent on the time of measurement.
Rights: aberto
Identifier DOI: 
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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