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Computed-Tomographic Measurement of Soil Macroporosity Parameters as Affected by Stiff-Stemmed Grass Hedges

^a Indonesia Center for Soil and Agroclimate Research and Development, Jl. Ir. H. Juanda 98 Bogor, Indonesia 16123
^b 302 Anheuser-Busch Natural Resources Building, Dep. of Soil, Environmental and Atmospheric Sciences, Univ. of Missouri, Columbia, MO 65211

View larger version (9K): [in a new window]   Fig. 1. Schematic sketch of grass hedge system illustrating the width of hedge (W1), width of cropped area (W2), original soil slope (So), and sampling positions (grass hedge, deposition zone 0.5 m upslope of the hedge, and row crop 7 m upslope of the hedge).

View larger version (25K): [in a new window]   Fig. 2. Frequency of the relative attenuation values for soil under each position for the (A) 0- to 100-mm and (B) 100- to 200-mm soil depths. The top scan of a typical replicate is shown.

View larger version (16K): [in a new window]   Fig. 3. Mean number of pores by soil depth for the three positions measured with CT images. Bar indicates LSD(0.05) value.

View larger version (18K): [in a new window]   Fig. 4. Computed tomography-measured macroporosity (>1000 µm diam) as a function of depth for the three positions. Bar indicates LSD(0.05) value.

View larger version (87K): [in a new window]   Fig. 5. Computed tomography images for the three positions at 20-mm soil depth: (A) grass hedge grayscale, (B) grass hedge binary, (C) row crop grayscale, (D) row crop binary, (E) deposition grayscale, and (F) deposition binary.

View larger version (17K): [in a new window]   Fig. 6. Computed tomography-measured mesoporosity (200–1000 µm diam) as a function of depth for the three positions. Bar indicates LSD(0.05) value.

View larger version (14K): [in a new window]   Fig. 7. Box-counting fractal dimension (D) of CT-measured porosity as a function of soil depth for the three positions. Bar indicates LSD(0.05) value.

View larger version (19K): [in a new window]   Fig. 8. Fractal dimension of CT-measured macroporosity for the (A) grass hedge, (B) row crop, and (C) deposition positions (n = 5).

View larger version (16K): [in a new window]   Fig. 9. Pore circularity of CT-measured porosity as a function of soil depth for the three positions. Bar indicates LSD(0.05) value.