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Published online 27 October 2006
Published in J Environ Qual 35:2202-2211 (2006)
DOI: 10.2134/jeq2006.0042
© 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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Nitrate and Sediment Fluxes from a California Rangeland Watershed

David J. Lewisa, Michael J. Singerb,*, Randy A. Dahlgrenb and Kenneth W. Tatec

a University of California Cooperative Extension, Santa Rosa, CA 95403
b Department of Land Air and Water Resources, University of California, Davis, CA 95616
c Department of Plant Sciences, University of California, Davis, CA 95616


Figure 1
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  		Fig. 1. Location of the Sierra Foothills Research and Extension Center in northern California.

 

Figure 2
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  		Fig. 2. Precipitation and stream flow in the Schubert watershed for water years 1981 to 2000.

 

Figure 3
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  		Fig. 3. Early season stream flow and precipitation for 1984 illustrating early season "priming" of the watershed soils.

 

Figure 4
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  		Fig. 4. Annual N export and stream flow from the Schubert watershed 1981 to 2000.

 

Figure 5
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  		Fig. 5. (A) Mean daily stream flow for the Schubert watershed 1981 to 2000. (B) Mean daily nitrate-nitrogen (NO3–N) load for the Schubert watershed 1981 to 2000.

 

Figure 6
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  		Fig. 6. Early season stream flow and nitrate-nitrogen concentration for the 1984 water year, and early season precipitation events for the 1984 water year.

 

Figure 7
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  		Fig. 7. Annual suspended sediment export and stream flow from the Schubert watershed 1981 to 2000.

 

Figure 8
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  		Fig. 8. (A) Mean daily stream flow for the Schubert watershed 1981 to 2000. (B) Mean daily suspended sediment load for the Schubert watershed 1981 to 2000.

 

Figure 9
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  		Fig. 9. Probability plots of daily nitrate-nitrogen (NO3–N) and suspended sediment loads in stream water for the Schubert watershed.

 




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