Phosphorus retention and fractionation in an eutrophic wetland: A one-year mesocosms experiment under fluctuating flooding conditions.

摘要: Abstract This study aimed to evaluate the response of salt marshes pulses PO 4 3- -enriched water, with and without presence Phragmites australis . A one-year mesocosms experiment was performed in simulated soil profiles (fine-textured surface layers sandy subsurface layers) from a coastal marsh Mar Menor lagoon under alternating flooding-drying conditions eutrophic low (1.95 mg L −1 P-PO ) high (19.5 mg L P load, presence/absence The concentrations porewater drainage water were regularly measured, accumulated soils (including fractionation procedure) plants (roots, rhizomes, stems leaves) analyzed. experimental highly effective removal flooding (>90% reduction added system both pore water), regardless nutrient season year main sink system, while had minor role removal. biomass ∼27% treatment load ∼12% that load; rhizomes organs contributed most (∼67–72% total retained by plants). Ca/Mg compounds contributors retention compartment, especially fine-textured (∼34–53% present this fraction). favored onto metal oxides (∼12% increase fraction load). Hence, use constructed wetlands ameliorate negative impacts P-enriched waters similar areas is recommended. We propose incorporation carbonated materials, content compounds, favor these systems.