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| International Agrophysics |
| publisher: | Institute of Agrophysics
Polish Academy of Sciences
Lublin, Poland |
| ISSN: |
0236-8722 |
vol. 23, nr. 4 (2009)
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Fractal dimension and anisotropy of soil CO2 emission in an agricultural field during fallow
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N. La Scala Jr1, A.R. Panosso1, G.T. Pereira1, A.P. Gonzalez2, J.G.V. Miranda3
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1 Agrarian and Veterinarian Faculty, Săo Paulo State University (FCAV/UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n. 14883-292, Jaboticabal, SP, Brazil |
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2 Science Faculty, Coruńa University, Zapatteira, 15.071 Coruńa, Spain |
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3 Physics Faculty, Federal University of Bahia, Salvador, BA, Brazil |
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vol. 23 (2009), nr. 4,
pp. 353-358
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abstract
The study of soil CO2 emission is a relevant task due to the fact that it is related to many environmental issues, especially the enhanced greenhouse effect. In this work we investigated the spatial variability structure of a bare soil CO2 emission in an area of 80 x 80 m, during twelve different days. Spatial and temporal variability analyses in the 65-point grid indicate that significant spatial heterogeneity is present in most of the days. Fractal dimension values varying from 2 to 2.88 was determined in a direction of 84.3±22.5o, which is close to perpendicular of crop lines. This effect seems to be related to the structure of temporal variability of soil CO2 emission, which presents a complex net of correlation with 83% of grid points connected within the same cluster, also with most of the points aligned perpendicular to crop lines.
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keywords
soil respiration, soil CO2 flux, spatial variability, greenhouse gas
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