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Spatial Variation of Soil Phosphorus within a Drainage Ditch Network

^a Dep. of Environmental Science and Technology, Univ. of Maryland, 1109 H.J. Patterson Hall, College Park, MD 20742
^b USDA-ARS, Pasture Systems and Watershed Management Research Unit, University Park, PA 16802
^c Dep. of Agriculture, Univ. of Maryland Eastern Shore, Princess Anne, MD, 21853

View larger version (30K): [in this window] [in a new window]   Fig. 1. Overview of the ditch network located at the University of Maryland Eastern Shore Research Farm, Princess Anne, MD. Arrows indicate the direction of water flow within the ditch network (adapted from Vaughan, 2005).

View larger version (26K): [in this window] [in a new window]   Fig. 2. Pooled semivariograms of ditch soil ammonium oxalate-extractable Feox, Alox, and Pox. Percent degree of P saturation (DPS = [Pox/(Feox + Alox) x 100] and pH are also presented.

View larger version (38K): [in this window] [in a new window]   Fig. 3. Ammonium oxalate-extractable P (Pox) concentrations of ditch soils (0–5 cm) at a sampling resolution of 10 m within a ditch network located on the University of Maryland Eastern Shore Research Farm (n = 405). Areas identified with the letters A, B, C, D, or E are areas identified as being relatively high in Pox.

View larger version (40K): [in this window] [in a new window]   Fig. 4. Ammonium oxalate-extractable Fe (Feox) concentrations of ditch soils (0–5 cm) at a sampling resolution of 10 m within a ditch network located on the University of Maryland Eastern Shore Research Farm (n = 405). Areas identified with the letters A, B, C, D, or E are areas identified as being relatively high in Pox.

View larger version (39K): [in this window] [in a new window]   Fig. 5. Ammonium oxalate-extractable Al (Alox) concentrations of ditch soils (0–5 cm) at a sampling resolution of 10 m within a ditch network located on the University of Maryland Eastern Shore Research Farm (n = 405). Areas identified with the letters A, B, C, D, or E are areas identified as being relatively high in Pox.

View larger version (38K): [in this window] [in a new window]   Fig. 6. Percent degree P saturation (DPS) distribution of ditch soils (0–5 cm) at a sampling resolution of 10 m within a drainage ditch network located at the University of Maryland Eastern Shore Research Farm (n = 405). Areas identified with the letters A, B, C, D, or E are areas identified as being relatively high in Pox.

View larger version (41K): [in this window] [in a new window]   Fig. 7. Moist soil pH (1:1) distribution of ditch soils (0–5 cm) at a sampling resolution of 10 m within a drainage ditch network located on the University of Maryland Eastern Shore Research Farm (n = 405). Areas identified with the letters A, B, C, D, or E are areas identified as being relatively high in Pox.