Abstract
Seasonal fluctuation of phosphorus in water, and total phosphorus and different inorganic P fractions (extracted by NH4Cl, NH4F, NaOH and H2SO4) and organic P fraction (residual P) in surface sediment, were measured in the littoral of oligotrophic Lake Pääjärvi (southern Finland). After the emergence of Equisetum fluviatile L. shoots in mid June, water exchange between the littoral and pelagial area diminished and phosphorus concentrations in water and in surface sediment increased in the inner and mid littoral zones. Phosphorus pool in flocculent, ‘easily resuspensible’ sediment composed on average 62% of inorganic phosphorus and 38% of organic phosphorus. 63% of the inorganic phosphorus, on the average, was extracted from ‘apatite-P fraction’; 29% from ‘iron-P fraction’; 7% from ‘aluminum-P fraction’; and less than 1% from ‘loosely-bound P fraction’. During the growing season, net accumulation of sediment and phosphorus was measured only in the inner littoral zone whereas the outer littoral zones acted rather as a source of phosphorus for the pelagic area. The results of this study indicated that nutrient dynamics in littoral environment was through changes in flow environment greatly governed by the macrophytes.
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© 1994 Springer Science+Business Media Dordrecht
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Kairesalo, T., Matilainen, T. (1994). Phosphorus fluctuation in water and deposition into sediment within an emergent macrophyte stand. In: Mortensen, E., Jeppesen, E., Søndergaard, M., Nielsen, L.K. (eds) Nutrient Dynamics and Biological Structure in Shallow Freshwater and Brackish Lakes. Developments in Hydrobiology, vol 94. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2460-9_25
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DOI: https://doi.org/10.1007/978-94-017-2460-9_25
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