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Distribution of Inorganic Nitrogen and Phosphorus Concentrations in Stream Flow of Two Southern Piedmont Watersheds

D. H. Franklin*,a, J. L. Steinera, M. L. Cabrerab and E. L. Useryc

a 1420 Experiment Station Rd., Watkinsville, GA 30677
b Miller Plant Sciences Bldg., Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30601
c Geography Bldg., Geography Dep., Univ. of Georgia, Athens, GA 30601



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Fig. 1. Distribution of stream collection sites on the Greenbrier Creek and Rose Creek. Stream sample sites are depicted by plus sign. Location of watersheds in Georgia depicted by star.

 


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Fig. 2. Diagram of spatial distribution of A and B as area (upper boxes) and network (lower boxes) attributes. Spatial distributions of attributes are described with spatial autocorrelation analysis technique Moran's Coefficient (MC). When like attributes are clustered together, MC = 1; unlike attributes clustered, MC = -1; and random location, MC = 0.

 


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Fig. 3. Spatial autocorrelation for nitrate in Rose Creek (upper) and Greenbrier Creek (lower) for 1999. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 4. Spatial autocorrelation for nitrate on residuals for autoregression on drainage density (dd) in Rose Creek (upper) and Greenbrier Creek (lower) for 1999. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 5. Spatial autocorrelation for nitrate in Rose Creek (upper) and Greenbrier Creek (lower) for 2000. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 6. Spatial autocorrelation for DRP in Rose Creek (upper) and Greenbrier Creek (lower) for 1999. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 7. Spatial autocorrelation for DRP on residuals for autoregression on drainage density (dd) in Rose Creek (upper) and Greenbrier Creek (lower) for 1999. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 8. Spatial autocorrelation for DRP in Rose Creek (upper) and Greenbrier Creek (lower) for 2000. (Symbols *, **, + used to show 5, 1, and 10% levels of significance, respectively).

 


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Fig. 9. Water balance and precipitation north and south of the watersheds, and discharge of the Oconee River at a point downstream of the confluence of Rose Creek and Greenbrier Creek with the Oconee River (USGS, Penfield, GA).

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education
Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.