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Spatial Variability and Measurement Scale of Infiltration Rate on an Agricultural Landscape

^a School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051
^b Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907
^c Dep. of Natural Resources and Environmental Sciences, Univ. of Illinois, Urbana, IL 61801
^d Currently at Dep. of Geography and Environmental Engineering, Johns Hopkins Univ., Baltimore, MD 21218-2686
^e Currently at National Lab of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil & Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China

View larger version (16K): [in a new window]   Fig. 1. Elevation profile of the study transect, showing the location of the pedon description sites and the position of the hillslope transect (labeled H.T.). Note the exaggeration of the vertical scale.

View larger version (26K): [in a new window]   Fig. 2. Semivariograms (Ln-transformed) for local-scale infiltration measurement data for Drummer (top), Brenton (middle), and Dana (bottom) soils at their three respective horizons.

View larger version (16K): [in a new window]   Fig. 3. Sample variance vs. total measurement support area for the local-scale study.

View larger version (39K): [in a new window]   Fig. 4. Cumulative probability plots (actual and Ln-transformed) for the hillslope and landscape transect infiltration measurements.

View larger version (34K): [in a new window]   Fig. 5. Semivariograms (Ln-transformed) for (top) hillslope-scale and (bottom) landscape-scale infiltration measurement data.