Dissertations and Theses

Summary

In this work, the fractal concept was applied in the detailed study of the spatial variability of soil CO2 emission, soil physical and chemical attributes and environmental factors such as soil moisture and temperature in sugarcane area under the cane system in the northeast of the state of São Paulo. The anisotropy, characterized by the variability structure in different directions of the soil surface, was determined from the fractal dimension values ​​(DF) calculated based on the experimental variograms for the 0o, 45o, 90o and 135o directions in relation to the planting line of the sugarcane (0o). Multiple regression analysis indicated water free porosity (PLA) as one of the main factors related to spatial variability of FCO2 independent of the directions. Significant fracture-dimensional values ​​(DF <3) were obtained for most of the properties analyzed, but in different directions and specific for each variable studied. The results indicate that, in areas of raw cane, the anisotropy of the physical properties of the soil is caused by the anthropic action, thus altering the spatial variability pattern of the CO2 emission of the soil.