Abstract
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 Río Seco, altitude ~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 (<20 μm) with distance from the shore, probably due to wind erosion. Likely this explains the loss of amorphous metal oxides as they are often enriched in the fine sediment fraction. Changes in P-speciation toward less available pools were also observed as a result of desiccation. When re-wetted under oxic conditions, the sediments, especially those closest to the shore, released phosphate to the overlying water. The loss of adsorption capacity for phosphate upon re-wetting was associated with loss of amorphous iron oxides, and the changes appear to be non-reversible. Thus, both desiccation and re-wetting will lead to a decrease in sediment phosphate sorption capacity and increased water level fluctuations, a possible scenario in climate change, can therefore increase P availability in the water column of these oligotrophic systems.
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Acknowledgments
This research was supported by the project OAPN 129 A/2003 (Environmental Ministry of Spain), The Villum Kann Rasmussen Centre for Lake Restoration (CLEAR), and by Grant #21020463 from the Danish Natural Science Research Council. We thank F. Rueda and A. Rigosi for skilled sampling assistance.
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de Vicente, I., Andersen, F.Ø., Hansen, H.C.B. et al. Water level fluctuations may decrease phosphate adsorption capacity of the sediment in oligotrophic high mountain lakes. Hydrobiologia 651, 253–264 (2010). https://doi.org/10.1007/s10750-010-0304-x
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DOI: https://doi.org/10.1007/s10750-010-0304-x