Details
| Original language | English |
|---|---|
| Pages (from-to) | 897-907 |
| Number of pages | 11 |
| Journal | Soil Science Society of America Journal |
| Volume | 72 |
| Issue number | 4 |
| Publication status | Published - Jul 2008 |
| Externally published | Yes |
Abstract
Pore network geometries of intra-aggregate pore spaces are of great importance for water and ion flux rates controlling C sequestration and bioremediation. Advances in non-invasive three-dimensional imaging techniques such as synchrotron-radiation-based x-ray microtomography (SR-μCT), offer excellent opportunities to study the interrelationships between pore network geometry and physical processes at spatial resolutions of a few micrometers. In this paper we present quantitative three-dimensional pore-space geometry analyses of small scale (∼5 mm across) soil aggregates from different soil management systems (conventionally tilled vs. grassland). Reconstructed three-dimensional microtomography images at approximate isotropic voxel resolutions between 3.2 and 5.4 μm were analyzed for pore-space morphologies using a suite of image processing algorithms associated with the software published by Lindquist et al. Among the features quantified were pore-size distributions (PSDs), throat-area distributions, effective throat/pore radii ratios as well as frequency distributions of pore channel lengths, widths, and flow path tortuosities. We observed differences in storage and transport relevant pore-space morphological features between the two aggregates. Nodal pore volumes and throat surface areas were significantly smaller for the conventionally tilled (Conv. T.) aggregate (mode ≈ 7.9 × 10 -7 mm3/≈ 63 μm2) than for the grassland aggregate (mode ≈ 5.0 × 10-6 mm3/≈ 400 μm2), respectively. Path lengths were shorter for the Conv. T. aggregate (maximum lengths < 200 μm) compared with the grassland aggregate (maximum lengths > 600 μm). In summary, the soil aggregate from the Conv. T site showed more gas and water transport limiting micromorphological features compared with the aggregate from the grassland management system.
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Soil Science Society of America Journal, Vol. 72, No. 4, 07.2008, p. 897-907.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Three-dimensional quantification of intra-aggregate pore-space features using synchrotron-radiation-based microtomography
AU - Peth, S.
AU - Horn, R.
AU - Beckmann, F.
AU - Donath, T.
AU - Fischer, J.
AU - Smucker, A. J.M.
PY - 2008/7
Y1 - 2008/7
N2 - Pore network geometries of intra-aggregate pore spaces are of great importance for water and ion flux rates controlling C sequestration and bioremediation. Advances in non-invasive three-dimensional imaging techniques such as synchrotron-radiation-based x-ray microtomography (SR-μCT), offer excellent opportunities to study the interrelationships between pore network geometry and physical processes at spatial resolutions of a few micrometers. In this paper we present quantitative three-dimensional pore-space geometry analyses of small scale (∼5 mm across) soil aggregates from different soil management systems (conventionally tilled vs. grassland). Reconstructed three-dimensional microtomography images at approximate isotropic voxel resolutions between 3.2 and 5.4 μm were analyzed for pore-space morphologies using a suite of image processing algorithms associated with the software published by Lindquist et al. Among the features quantified were pore-size distributions (PSDs), throat-area distributions, effective throat/pore radii ratios as well as frequency distributions of pore channel lengths, widths, and flow path tortuosities. We observed differences in storage and transport relevant pore-space morphological features between the two aggregates. Nodal pore volumes and throat surface areas were significantly smaller for the conventionally tilled (Conv. T.) aggregate (mode ≈ 7.9 × 10 -7 mm3/≈ 63 μm2) than for the grassland aggregate (mode ≈ 5.0 × 10-6 mm3/≈ 400 μm2), respectively. Path lengths were shorter for the Conv. T. aggregate (maximum lengths < 200 μm) compared with the grassland aggregate (maximum lengths > 600 μm). In summary, the soil aggregate from the Conv. T site showed more gas and water transport limiting micromorphological features compared with the aggregate from the grassland management system.
AB - Pore network geometries of intra-aggregate pore spaces are of great importance for water and ion flux rates controlling C sequestration and bioremediation. Advances in non-invasive three-dimensional imaging techniques such as synchrotron-radiation-based x-ray microtomography (SR-μCT), offer excellent opportunities to study the interrelationships between pore network geometry and physical processes at spatial resolutions of a few micrometers. In this paper we present quantitative three-dimensional pore-space geometry analyses of small scale (∼5 mm across) soil aggregates from different soil management systems (conventionally tilled vs. grassland). Reconstructed three-dimensional microtomography images at approximate isotropic voxel resolutions between 3.2 and 5.4 μm were analyzed for pore-space morphologies using a suite of image processing algorithms associated with the software published by Lindquist et al. Among the features quantified were pore-size distributions (PSDs), throat-area distributions, effective throat/pore radii ratios as well as frequency distributions of pore channel lengths, widths, and flow path tortuosities. We observed differences in storage and transport relevant pore-space morphological features between the two aggregates. Nodal pore volumes and throat surface areas were significantly smaller for the conventionally tilled (Conv. T.) aggregate (mode ≈ 7.9 × 10 -7 mm3/≈ 63 μm2) than for the grassland aggregate (mode ≈ 5.0 × 10-6 mm3/≈ 400 μm2), respectively. Path lengths were shorter for the Conv. T. aggregate (maximum lengths < 200 μm) compared with the grassland aggregate (maximum lengths > 600 μm). In summary, the soil aggregate from the Conv. T site showed more gas and water transport limiting micromorphological features compared with the aggregate from the grassland management system.
UR - http://www.scopus.com/inward/record.url?scp=47249142399&partnerID=8YFLogxK
U2 - 10.2136/sssaj2007.0130
DO - 10.2136/sssaj2007.0130
M3 - Article
AN - SCOPUS:47249142399
VL - 72
SP - 897
EP - 907
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
SN - 0361-5995
IS - 4
ER -