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Published online 9 January 2007
Published in J Environ Qual 36:80-90 (2007)
DOI: 10.2134/jeq2006.0096
© 2007 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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Denitrification in the Shallow Ground Water of a Tile-Drained, Agricultural Watershed

Edward Mehnerta,*, Hue-Hwa Hwanga, Thomas M. Johnsonb, Robert A. Sanfordb, Will C. Beaumontb and Thomas R. Holmc

a Illinois State Geological Survey, 615 E. Peabody Dr., Champaign, IL 61820
b Dep. of Geology, Univ. of Illinois at Urbana-Champaign, 1301 West Green St., Urbana, IL 61801
c Illinois State Water Survey, 2204 Griffith Dr., Champaign, IL 61820


Figure 1
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  		Fig. 1. Location map showing the Big Ditch watershed and data collection sites. Inset map shows the position of the watershed in Illinois, United States.

 

Figure 2
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  		Fig. 2. Precipitation at Rantoul, IL.

 

Figure 3
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  		Fig. 3. Streamflow and nitrate N concentration in Big Ditch (Keefer and Bauer, 2005). The bars along the x axis shows periods of base flow only.

 

Figure 4
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  		Fig. 4. Nitrogen species concentrations in all ground water samples.

 

Figure 5
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  		Fig. 5. Concentrations of (a) total N and (b) NO3––N in all wells. Filled symbols indicate the wells sampled for N and O isotopes.

 

Figure 6
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  		Fig. 6. Box plot of dissolved oxygen in the shallow ground water of the Big Ditch watershed.

 

Figure 7
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  		Fig. 7. Nitrogen and oxygen isotope ratio data. Open circles represent tile drain samples. Closed circles, diamonds, triangles, and squares represent samples from Wells 3, 5, 6, and 11, respectively. The solid line represents the evolution of a hypothetical packet of water with initial {delta}15N = {delta}18O = 5.0 as it undergoes denitrification with {varepsilon} = 12.0{per thousand} for N and 5.7{per thousand} for O. Uncertainties are smaller than the sizes of the symbols.

 




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