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Nitrogen processing by biofilms along a lowland river continuum
10.1002/rra.896.abs
While numerous studies have examined N dynamics along a river continuum, few have specifically examined the role of biofilms. Nitrogen dynamics and microbial community structure were determined on biofilms at six sites along a 120 km stretch of the lowland Ovens River, South Eastern Australia using artificial substrates. Terminal restriction fragment length polymorphism (T‐RFLP), chlorophyll a and protein analyses were used to assess biofilm microbial community composition. N dynamics was determined on the biofilms using the acetylene (C2H2) block technique and assessing changes in NH, NOx and N2O. Unlike microbial community structure, N dynamics were spatially heterogeneous. Nitrification, determined from the difference in accumulation of NH before and after addition of C2H2, occurred mostly in the upper sites with rates up to 1.4 × 10−5 mol m−2 h−1. The highest rates of denitrification occurred in the mid‐reaches of the river (with rates up to 1 × 10−5 mol m−2 h−1) but denitrification was not detected in the lower reaches. At the very most, only 50% of the observed uptake of NOx by the biofilms following addition of C2H2 could be accounted for by denitrification. Copyright © 2005 John Wiley & Sons, Ltd.
Nitrogen processing by biofilms along a lowland river continuum
10.1002/rra.896.abs
While numerous studies have examined N dynamics along a river continuum, few have specifically examined the role of biofilms. Nitrogen dynamics and microbial community structure were determined on biofilms at six sites along a 120 km stretch of the lowland Ovens River, South Eastern Australia using artificial substrates. Terminal restriction fragment length polymorphism (T‐RFLP), chlorophyll a and protein analyses were used to assess biofilm microbial community composition. N dynamics was determined on the biofilms using the acetylene (C2H2) block technique and assessing changes in NH, NOx and N2O. Unlike microbial community structure, N dynamics were spatially heterogeneous. Nitrification, determined from the difference in accumulation of NH before and after addition of C2H2, occurred mostly in the upper sites with rates up to 1.4 × 10−5 mol m−2 h−1. The highest rates of denitrification occurred in the mid‐reaches of the river (with rates up to 1 × 10−5 mol m−2 h−1) but denitrification was not detected in the lower reaches. At the very most, only 50% of the observed uptake of NOx by the biofilms following addition of C2H2 could be accounted for by denitrification. Copyright © 2005 John Wiley & Sons, Ltd.
Nitrogen processing by biofilms along a lowland river continuum
Baldwin, D. S. (Autor:in) / Mitchell, A. M. (Autor:in) / Rees, G. N. (Autor:in) / Watson, G. O. (Autor:in) / Williams, J. L. (Autor:in)
River Research and Applications ; 22 ; 319-326
01.03.2006
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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