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Assessment of CT-Measured Porosity in Russian Soils Using Fractal Dimension and Lacunarity

Excerpt

X-ray computed tomography (CT) has been used to evaluate differences in structure for soils. Soil development under different ecological regions has been found to significantly alter soil structural properties. Objectives of this study were to evaluate CT scan porosity images using fractal dimension and lacunarity for Russian soils developed under meadow, forest and a forest-meadow transition zone. Thirty intact samples taken at two depths were scanned at 7 mm distances throughout each core to provide nine scans per sample. For moist soil samples (−10 kPa potential), the fractal dimension and lacunarity were statistically different (P<0.05) among ecosystem treatments. However for dry soil samples (<−3 MPa), only the fractal dimension was statistically different among treatments. Results of the study indicate that fractal dimension significantly (P<0.05) decreased with soil depth for both water potentials but lacunarity was not significantly affected by depth. Saturated hydraulic conductivity was found to be correlated with CT-measured macroporosity (r=0.69) and the slope of the lacunarity curve (r=−0.53). Fractal analysis of CT images from soils offers a potential tool for evaluating soil macroporosity changes under different ecosystems.

  • Abstract
  • Introduction
  • Materials and Methods
  • Results and Discussion
  • Summary
  • References

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