La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Water level fluctuations may decrease phosphate adsorption capacity of the sediment in oligotrophic high mountain lakes
Auteurs :	Inmaculada de Vicente, Auteur ; Frede Ostergaard Andersen, Auteur ; Hans Christian Bruun Hansen, Auteur ; Luis Cruz-Pizarro, Auteur ; Henning Skovgaard Jensen, Auteur
Type de document :	Article
Dans :	Hydrobiologia (651(1) SEP 2010)
Article en page(s) :	253-264
Résumé :	The effect of sediment desiccation and re-wetting on phosphate adsorption and desorption properties was examined in two oligotrophic high mountain lakes (La Caldera and Rio Seco, altitude similar to 3000 m) in the Sierra Nevada National Park, Spain. Decrease in phosphate sorption properties was observed in transects from the littoral zone to dry land (up to the high water mark) in both lakes concomitantly with loss of amorphous oxides of iron and aluminum as revealed by oxalate and dithionite extractions. X-ray diffraction did not indicate increased amounts of crystalline metal oxides, but there was a loss of fine particles (

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