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Particulate Phosphorus Transport within Stream Flow of an Agricultural Catchment

^a AgResearch Ltd, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand
^b National Institute of Water and Atmospheric Research, P.O. Box 11 115, Hamilton, New Zealand

View larger version (33K): [in a new window]   Fig. 1. Land use (left), elevation (right), and sampling sites (1–4) along the Bog Burn catchment, Southland, New Zealand.

View larger version (21K): [in a new window]   Fig. 2. Fortnightly suspended sediment (SS), dissolved reactive phosphorus (DRP), and total phosphorus (TP) concentrations in stream flow at each site and daily mean flow at Site 3.

View larger version (22K): [in a new window]   Fig. 3. Sediment and bioavailable phosphorus (BAP) and total phosphorus (TP) concentrations trapped in samplers located at each site. Note the different scales on the P concentration axes.

View larger version (23K): [in a new window]   Fig. 4. The relationship between bioavailable P (solid symbols) and total P (open symbols) and mass of sediment trapped at each site. The dashed vertical line represents the point of inflexion for the split-line model (not shown for clarity).

View larger version (23K): [in a new window]   Fig. 5. Laser particle size distribution of dispersed and nondispersed sediment samples from Sites 1 and 4 on 21 Jan. 2003.

View larger version (29K): [in a new window]   Fig. 6. Cesium-137 concentration in stream bank and bed sediments, topsoil and subsoil, and bulked suspended sediment (SS) samples for each sampling site. Error bars are 95% confidence intervals.