Numerous soil ecological functions are influenced by soil structure through its impact on spatial and temporal distributions of soil particles, water, and air within the soil profile. The nondestructive technique of x-ray computed tomography (CT) was used for studying soil structure. X-ray attenuation determined for two energy levels (80 kV and 120 kV) was used to calculate distributions of water, air, and solids, as well as the voxel dry bulk density for two silt loam subsoils. The spatial resolution during scanning was 0.25 mm in the horizontal and 1 mm in the vertical direction. For different voxel sizes, the weighted mean of the derived volumetric water, air, and solid contents, and the dry bulk densities agreed with the sample's phase composition and dry bulk density obtained by weighing. The use of dual energy scanning to study the heterogeneity of soil structure and the spatial distribution of water, air, and solids is discussed.
Discrimination of Soil Phases by Dual Energy X‐ray Tomography
H. Rogasik,J. Crawford,O. Wendroth,I. Young,M. Joschko,K. Ritz
Published 1999 in Soil Science Society of America Journal
ABSTRACT
PUBLICATION RECORD
- Publication year
1999
- Venue
Soil Science Society of America Journal
- Publication date
1999-07-01
- Fields of study
Materials Science, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- dual energy x-ray tomography
A computed tomography approach that acquires scans at two x-ray energy levels to infer soil phase distributions.
Aliases: dual-energy scanning, dual energy scanning, dual-energy X-ray tomography
- gravimetric reference measurements
Mass-based measurements obtained by weighing and used as the reference for phase composition and dry bulk density.
Aliases: weighing
- silt loam subsoils
Two subsoil samples with silt loam texture that were scanned in the tomography experiment.
Aliases: subsoils
- soil structure heterogeneity
Variation in the arrangement of particles, pores, water, and air within the soil profile.
Aliases: heterogeneity of soil structure
- voxel dry bulk density
The dry bulk density estimated separately for each CT voxel from the attenuation measurements.
Aliases: dry bulk density
- water, air, and solids
The three soil constituents whose spatial distributions and volumetric contents are estimated from the CT data.
- x-ray attenuation
The reduction in x-ray intensity measured at different energies and used here as the basis for phase estimation.
Aliases: attenuation
REFERENCES
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