| Issue |
Ann. Limnol. - Int. J. Lim.
Volume 42, Number 1, March 2006
|
|
|---|---|---|
| Page(s) | 43 - 52 | |
| DOI | https://doi.org/10.1051/limn/2006005 | |
| Published online | 15 February 2009 | |
Nitrogen dynamics in rural streams : differences between geomorphologic units
1
ECOBIO - U.M.R.6553 CNRS, Université de Rennes I, Avenue du Général Leclerc, F-35042 Rennes Cedex, France
2
GEOLAB - UMR 6042 CNRS, Université Blaise Pascal - Clermont-Ferrand, Maison de la Recherche 4, rue Ledru 63057 Clermont-Ferrand
Cedex 1, France
Corresponding author: pierre.marmonier@univ-rennes1.fr
Nitrogen dynamics were investigated in the top centimeters of bottom sediment in three different geomorphologic units (riffles, sand bars, pools) and along two contrasted reaches (nitrogen-rich, nitrogen-poor) of a rural stream. Some predictions of links between geomorphology and processes were verified: (i) hydrological exchanges and nitrification were lower in pools than in riffles and bars, whereas (ii) ammonification and denitrification were higher in pools. Studies of denitrification potential in six other reaches of three N-rich streams support these conclusions and demonstrate that pools are spots of high microbial activity in streams.
Key words: river / sediments / hydrological exchanges / hyporheic zone / denitrification
© Université Paul Sabatier, 2006
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