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Nitrogen dynamics in rural streams : differences between geomorphologicunits

Published online by Cambridge University Press:  15 February 2009

S. Lefebvre ,
P. Marmonier  and
J. L. Peiry
S. Lefebvre
Affiliation:
ECOBIO - U.M.R.6553 CNRS, Université de Rennes I, Avenue du Général Leclerc, F-35042 Rennes Cedex, France
P. Marmonier
Affiliation:
ECOBIO - U.M.R.6553 CNRS, Université de Rennes I, Avenue du Général Leclerc, F-35042 Rennes Cedex, France
J. L. Peiry
Affiliation:
GEOLAB - UMR 6042 CNRS, Université Blaise Pascal - Clermont-Ferrand, Maison de la Recherche 4, rue Ledru 63057 Clermont-Ferrand Cedex 1, France
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Abstract

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 predictionsof links between geomorphology and processes were verified: (i) hydrological exchanges and nitrification were lower in poolsthan in riffles and bars, whereas (ii) ammonification and denitrification were higher in pools. Studies of denitrification potentialin six other reaches of three N-rich streams support these conclusions and demonstrate that pools are spots of high microbialactivity in streams.

Keywords

riversedimentshydrological exchangeshyporheic zonedenitrification
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 42 , Issue 1 , March 2006 , pp. 43 - 52
Copyright
© Université Paul Sabatier, 2006

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