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Published online 27 October 2006
Published in J Environ Qual 35:2103-2112 (2006)
DOI: 10.2134/jeq2006.0072
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Geomorphological Variability in Channel Characteristics on Sediment Denitrification in Agricultural Streams

Matthew R. Opdykea,*, Mark B. Davida and Bruce L. Rhoadsb

a University of Illinois, Department of Natural Resources and Environmental Sciences, 1102 S. Goodwin Ave., Urbana, IL 61801
b University of Illinois, Department of Geography, 607 S. Mathews Ave., Urbana, IL 61801


Figure 1
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  		Fig. 1. Location of study reaches in Champaign County, east-central Illinois. Subscripts C and M indicate channelized and meandering reaches, respectively.

 

Figure 2
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  		Fig. 2. Photographs of the channelized (subscript C) and meandering (subscript M) stream sites on the Embarras (EMB) and East Branch Embarras (EBE) rivers. Geomorphic features at the meandering sites are labeled on the photographs.

 

Figure 3
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  		Fig. 3. Daily average discharge and stream NO3–N concentrations for the Embarras River basin near Camargo, IL, from 1 June 2003 to 28 Feb. 2005.

 

Figure 4
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  		Fig. 4. Mean sediment denitrification rates (one standard error) for geomorphic features at the meandering reaches of the Embarras (EMB) and East Branch Embarras (EBE) rivers averaged by season from June 2003 to February 2005. Different letters indicate significant differences between means for a specific season (Kruskal–Wallis, P < 0.05).

 

Figure 5
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  		Fig. 5. Relationship between sediment denitrification rates for geomorphic features at the meandering reaches of the Embarras (EMB) and East Branch Embarras (EBE) rivers and benthic organic matter. Figure excludes sediment denitrification rates measured in February and when stream NO3–N concentrations were <1 mg L–1.

 

Figure 6
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  		Fig. 6. Relationship between mean benthic organic matter of sediment samples collected between June 2003 and February 2005 and silt and clay in sediments measured in November 2004. Each value represents a channelized reach or geomorphic feature within a meandering reach on the Embarras and East Branch Embarras rivers.

 




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