Fractal dimension and anisotropy of soil CO2 emission in an agricultural field during fallow
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Agrarian and Veterinarian Faculty, Săo Paulo State University (FCAV/UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n. 14883-292, Jaboticabal, SP, Brazil
Science Faculty, Coruńa University, Zapatteira, 15.071 Coruńa, Spain
Physics Faculty, Federal University of Bahia, Salvador, BA, Brazil
Int. Agrophys. 2009, 23(4): 353-358
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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