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Controls on Catchment-Scale Patterns of Phosphorus in Soil, Streambed Sediment, and Stream Water

^a Dep. of Physical Geography, Utrecht Univ., P.O. Box 80 115, 3508 TC Utrecht, The Netherlands
^b National Soil Resources Inst., Cranfield Univ., North Wyke Research Station, Okehampton, Devon EX20 2SB, UK
^c British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
^d Cross Institute Programme for Sustainable Soil Function, Institute of Grassland and Environmental Research (IGER), North Wyke Research Station, Okehampton, Devon EX20 2SB, UK
^e Dep. of Environmental Science, Lancaster Univ., Lancaster, LA1 4YQ, UK

View larger version (29K): [in this window] [in a new window]   Fig. 1. Location of the Tamar catchment.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Partitioning of the variation of a response variable y among two sets of explanatory variables. The entire square represents the total variation in y (adapted from Legendre and Legendre, 1998).

View larger version (9K): [in this window] [in a new window]   Fig. 3. Partitioning of the variation of (a) log-transformed soil total P and (b) log-transformed soil Olsen P. The total surface areas of the big squares represent 100%.

View larger version (64K): [in this window] [in a new window]   Fig. 4. Interpolated soil total P concentrations (g kg–1) in the Tamar catchment.

View larger version (40K): [in this window] [in a new window]   Fig. 5. Streambed sediment total P concentrations (g kg–1) predicted from soil total P concentrations using the P transport model.

View larger version (16K): [in this window] [in a new window]   Fig. 6. Partitioning of the variation of streambed sediment P. The total surface area of the big square represents 100%.

View larger version (19K): [in this window] [in a new window]   Fig. 7. Partitioning of the variation of stream water TP (<0.45). The shaded areas represent negative contributions to the variation. The total surface of the white area represents 100%.