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Published online 20 September 2006
Published in Soil Sci Soc Am J 70:1872-1881 (2006)
DOI: 10.2136/sssaj2006.0201
© 2006 Soil Science Society of America
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Soil Hydraulic Conductivities and their Spatial and Temporal Variations in a Vertisol

Surajit Das Gupta, Binayak P. Mohanty* and J. Maximilian Köhne

Dep. of Biological and Agricultural Engineering, 2117 TAMU, Texas A&M Univ., College Station, TX 77843-2117. J. Maximilian Köhne now at Univ. of Rostock, Germany


Figure 1
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  		Fig. 1. Representative vegetation and surface cracks in soil within the experimental plot. Structural crack apertures ranged between submillimeter to a few millimeters.

 

Figure 2
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  		Fig. 2. The 20- by 16-m experimental plot divided into four (7- by 5-m) sites with 2-m spacing on all sides. The circles in each site denote the different infiltration disk diameters used for the experiments. A typical experimental layout for May 2003 is shown.

 

Figure 3
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  		Fig. 3. Box plots of hydraulic conductivity [K({Psi})] values at different pressure heads for different disk sizes.

 

Figure 4
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  		Fig. 4. (A) The temporal variability of hydraulic conductivity [K({Psi})] values and antecedent moisture content (AMC) at varying pressure heads ({Psi} = –0.2, –0.15, and –0.1 m), and (B) the correlation between K({Psi}) and AMC for the same pressure heads.

 

Figure 5
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  		Fig. 5. (A) The temporal variability of hydraulic conductivity [K({Psi})] values and antecedent moisture content (AMC) at varying pressure heads ({Psi} = –0.05, –0.02, and 0 m), and (B) the correlation between K({Psi}) and AMC for the same pressure heads.

 

Figure 6
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  		Fig. 6. Scatter plot of macropore flow near saturation (soil water pressure head {Psi} = –0.02 m) and matrix flow at a low {Psi} (–0.2 m) for the combined data sets of the 0.2- and 0.24-m disks.

 




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