Sediment phosphate composition in relation to emergent macrophytes in the Doñana Marshes (SW Spain)

Water Research
M ReinaL Serrano

Abstract

We have studied the effect of the presence of emergent macrophytes on the sediment phosphate composition of a eutrophic shallow marsh on the NE margin of Doñana (SW Spain). Top sediment and water samples were collected from both the open-water and the vegetated sites at three areas covered by different plant species: Scirpus maritimus, Juncus subulatus and Phragmites australis. The concentration of organic matter was significantly higher in the top sediment of sites covered by vegetation than in their adjacent open-water sites at the three vegetation areas. The P-fractional composition showed that the sediment was dominated by the inorganic P-fractions in all cases, reaching the highest concentration in the Ca-bound P-fraction (281-372 microg g(-1) d.w.). The sum of all P-fractions was significantly higher in the top sediment of the sites covered by J. subulatus and S. maritimus than in their adjacent open-water sites, and so were the org-P fraction extracted by hot NaOH and the concentration of phytate within this fraction. Deposition of plant material on the top sediment of areas vegetated by J. subulatus and S. maritimus explains these differences. The P-fractional composition of the seeds from J. subulatus showed that they ...Continue Reading

References

Nov 20, 1998·Folia Microbiologica·J Dvoráková
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Feb 18, 2004·Journal of Environmental Quality·Eugènia MartiFrancesc Sabater
Oct 1, 2005·American Journal of Botany·José L EspinarLuis V García

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Citations

May 23, 2013·Journal of Environmental Management·M A MaineM C Pedro

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