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Spatial Variability Analysis of Soil Physical Properties of Alluvial Soils

^a Dep. of Agricultural and Biological Engineering, Mississippi State Univ., Mississippi State, MS 39762
^b Dep. of Plant and Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
^c USDA-ARS, Crop Science Research Lab., P.O. Box 5367, Mississippi State, MS 39762
^d Dep. of Agricultural and Biological Engineering, Texas A&M University, College Station, TX 77843
^e Dep. of Agronomy, Lilly Hall of Life Sci., 915 W. State Street, Purdue Univ., West Lafayette, IN 47907

View larger version (32K): [in a new window]   Fig. 1. Map of study site showing 209 soil sampling locations, drainage channels, and elevation contours (m).

View larger version (48K): [in a new window]   Fig. 2. Semivariograms and kriged maps of soil bulk density for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (57K): [in a new window]   Fig. 3. Semivariograms and kriged maps of percentage sand content for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (57K): [in a new window]   Fig. 4. Semivariograms and kriged maps of percentage clay content for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (62K): [in a new window]   Fig. 5. Semivariograms and kriged maps of saturated hydraulic conductivity (Ks) for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (55K): [in a new window]   Fig. 6. Semivariograms and kriged maps of volumetric water content (v), cm3 cm–3, expressed in percentage at field capacity (equivalent to –33 kPa pressure head) for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (54K): [in a new window]   Fig. 7. Semivariograms and kriged maps of volumetric water content (v), cm3 cm–3, expressed in percentage at wilting point (equivalent to –1500 kPa pressure head) for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (59K): [in a new window]   Fig. 8. Semivariograms and kriged maps of available water content (AWC), cm3 cm–3, expressed in percentage for the (a) surface, (b) subsurface, and (c) deep horizons.

View larger version (27K): [in a new window]   Fig. 9. Spatial autocorrelation, Moran's I, of soil physical properties for surface, subsurface, and deep soil horizons (n = 209). Ks is saturated hydraulic conductivity (cm d–1), and values –10, –33, and –1500 kPa represent volumetric water content (cm3 cm–3, expressed as a percentage) at specified pressure head.