Publicação: Fractal dimension and anisotropy of soil CO2 emission in an agricultural field during fallow
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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 × 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±22.5°, 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. © 2009 Institute of Agrophysics, Polish Academy of Sciences.
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Greenhouse gas, Soil CO2 flux, Soil respiration, Spatial variability
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Inglês
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International Agrophysics, v. 23, n. 4, p. 353-358, 2009.
