Ann. Limnol. - Int. J. Lim.
Volume 47, Number 3, 2011
|Page(s)||231 - 238|
|Published online||09 August 2011|
Low nitrogen and phosphorus release from sediment deposited on a Danish restored floodplain
1 Department of Bioscience, Aarhus University, Vejlsøvej 25, DK-8600 Silkeborg, Denmark
2 Institute of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
* Corresponding author: firstname.lastname@example.org
Accepted: 13 April 2011
River floodplains and riparian areas are often considered efficient traps for sediment and sediment-associated nutrients such as nitrogen (N) and phosphorus (P). However, few studies have focused on the fate of sediment-bound N and P after deposition on floodplains. In this study, the leaching of N and P from sediment deposited on a Danish-restored floodplain was quantified by placing trapped sediment samples under a rainfall simulator and exposing them to in situ temperatures and precipitation for two months. The nitrate release was 2.72–1600 μg NO3-N.g−1 DW which corresponded to 0.06–6.42% of the total nitrogen contained in the sediment. Total dissolved phosphorus (TDP) release was 0.44–3.17 μg P.g−1 DW, corresponding to 0.021–0.065% of the TP content of the sediment. Our results indicate that N and P release from floodplain sediment subjected to rainfall events is very low, which should be considered when applying floodplain restoration to mitigate the load of N and P to rivers.
Key words: Phosphorus / nitrogen / floodplain / river / restoration
© EDP Sciences, 2011
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