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Phosphate and Sulfate Sorption in Spodosols with Albic Horizon from Northern Spain

Departamento de Edafoloxía e Química Agrícola. Facultade de Bioloxía. Universidade de Santiago de Compostela. 15782-Santiago de Compostela, Spain

View larger version (58K): [in a new window]   Fig. 1. Sampling sites (dashed area has a total annual precipitation 800 mm).

View larger version (39K): [in a new window]   Fig. 2. Infrared spectra of untreated soil samples (<2 mm) from the spodic horizons studied.

View larger version (25K): [in a new window]   Fig. 3. (A) Percentage of PO4 sorption from a 1.6 mM PO4 solution and percentage of SO4 sorbed from a 1.6 mM SO4 solution plotted against reactive Al and Fe (expressed as Alo + Feo; units in mmol kg-1). (B) Percentage of PO4 sorption from 16.1 mM PO4 solution plotted against reactive Al and Fe (expressed as Alo + Feo; units in mmol kg-1).

View larger version (30K): [in a new window]   Fig. 4. (A–D) Values of SO4 sorbed and Si and DOC in solution obtained for the 0.4 mM and 1.6 mM SO4 treatments (units in mmol kg-1). (E–H) Values of PO4 sorbed and Si and DOC in solution obtained for the 1.6 and 16.1 mM PO4 treatments (units in mmol kg-1).

View larger version (17K): [in a new window]   Fig. 5. Net Si + DOC + SO4 released plotted against net PO4 sorbed (data from the 16.1 mM PO4 treatment minus data from 1.6 mM PO4 solution), in the four Spodosols studied.