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Soil Water Regime in Space and Time in a Small Georgia Piedmont Catchment under Pasture

USDA-ARS, J. Phil Campbell Sr. Natural Resource Conservation Center, 1420 Experiment Station Road, Watkinsville, GA 30677

View larger version (30K): [in a new window]   Fig. 1. Elevation contour lines in meters, soil boundary, and location of time domain reflectometry (TDR)-based soil water content measurement sites at W1.

View larger version (39K): [in a new window]   Fig. 2. Textural differentiation with depth at W1: (a) mean clay, sand, and silt content with 95% confidence limit (95%CL) for mean clay content; and (b) spatial variation of clay content with depth. TDR1-a, TDR1-b, etc., indicate data from two locations (a and b) near the corresponding time domain reflectometry-based measurement site.

View larger version (36K): [in a new window]   Fig. 3. Contour lines in centimeters of depth to top of the Bt horizon, and location of time domain reflectometry (TDR)-based soil water content measurement sites at W1.

View larger version (56K): [in a new window]   Fig. 4. Time series of average volumetric soil water content at W1 from 3 Mar. 1998 to 1 Mar. 2001.

View larger version (42K): [in a new window]   Fig. 5. Box plots showing distribution of average soil water content by depth and season for the three driest ‘dry’ and the three wettest ‘wet’ of the 12 soil water measurement sites. The dots indicate outliers beyond the 10th and 90th percentiles represented by the whiskers. Dashed and solid lines within the boxes indicate mean and median soil water content, respectively.

View larger version (52K): [in a new window]   Fig. 6. Weekly precipitation less weekly potential evapotranspiration (PET) at W1 for 1998 to 2000.

View larger version (26K): [in a new window]   Fig. 7. Comparison of time domain reflectometry (TDR) and gravimetric (Grv)-based soil water content for the Ap (a) and Bt (b) horizons at six of twelve TDR sites at W1. The legend in (b) applies to (a) also.

View larger version (20K): [in a new window]   Fig. 8. Multidimentional scaling (MDS) dimensions for the 12 soil water measurement sites. Dimensions at the zero depth line of the depth axis are for the whole profile, those at the –15-cm depth line for the 0- to 15-cm depth, and those at the –30-cm depth line for the 15- to 30-cm depth, and so on.

View larger version (36K): [in a new window]   Fig. 9. Box plots showing distribution of soil water content in the 0- to 15- and 15- to 30-cm depths before runoff events at the 12 TDR-sites, with sites ranked from 1, dry, to 12, wet based on mean soil water content. Dashed and solid lines within the boxes indicate mean and median soil water content, respectively.