Phosphorus retention in a coastal salt marsh in SE Spain

Total and inorganic soil P were extracted froma coastal saltmarsh in SE Spain receiving eutrophicatedwater of urban and agricultural origin. The greatest P contents were obtained within the upper 10 cm of soil of those sectors of the salt marsh most affected by urban wastewater effluents.Most of the P was extracted usingHCl, indicating that it ismainly bonded toCa compounds.Only in sites with low CaCO3 content was the quantity of P associated with Fe and Al oxides and hydroxides (extracted with NaOH) noticeable