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Regional Scale Variability in Sediment and Nutrient Delivery from Small Agricultural Watersheds

^a Laboratory for Experimental Geomorphology, Katholieke Universiteit Leuven, Redingenstraat 16, B-3000 Leuven, Belgium
^b Postdoctoral Fellow of the Fund for Scientific Research—Flanders

View larger version (93K): [in a new window]   Fig. 1. Sediment core taken in the Ciplet retention pond showing four sedimentary events (total length = 14.9 cm).

View larger version (19K): [in a new window]   Fig. 2. Relation between total phosphorus (TP) and the fine sediment fraction (<16 µm) for all analyzed sediment samples taken in 13 retention ponds.

View larger version (35K): [in a new window]   Fig. 3. Variation of sediment texture and sediment-associated nutrient content with depth for one of the sediment cores taken in the Ciplet retention pond (see also Fig. 1).

View larger version (21K): [in a new window]   Fig. 4. Relationship between total phosphorus (TP) content and sediment texture both for detailed samples taken in the Ciplet retention pond and for bulk samples covering the total sediment depth.

View larger version (24K): [in a new window]   Fig. 5. Annual variation of sediment (STE) and sediment-associated nutrient trap efficiency (NTE) for the Hammeveld retention pond as simulated with the STEP model.

View larger version (56K): [in a new window]   Fig. 6. Spatial distribution of P2O5 production and application on agricultural land within Flanders. (a) The total P2O5 application rate without taking into account P2O5 redistribution, (b) the local animal P2O5 production, and (c) the actual P2O5 application rate taking into account P2O5 redistribution. Units of P2O5 application and production rates are expressed in kg P2O5 ha-1 agricultural land (includes cropland and grassland) (Vlaamse Landmaatschappij, 2001). The location of the studied retention ponds is indicated with a .