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Nitrate Removal Effectiveness of a Riparian Buffer along a Small Agricultural Stream in Western Oregon

P. J. Wigington, Jr.*,a, S. M. Griffithb, J. A. Fieldc, J. E. Bahamc, W. R. Horwathd, J. Owenb, J. H. Davisb,d, S. C. Raina and J. J. Steinerb

a NHEERL-Western Ecology Division, USEPA, 200 SW 35th St., Corvallis, OR 97333
b USDA Agricultural Research Service, Corvallis, OR 97331
c Oregon State University, Corvallis, OR 97331
d CA 95616



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Fig. 1. Lake Creek riparian study site. LCW, Lake Creek West; LCE, Lake Creek East; NCR, noncultivated riparian zone; CR, cultivated riparian zone; FLD, perennial ryegrass seed field.

 


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Fig. 2. Mean daily stage at Lake Creek West, November 1995 to June 1997.

 


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Fig. 3. Continuous stream stage and ground water potentiometric surface elevations, November 1995 to February 1996. The terms GW1, GW2, and GW3 indicate piezometer locations.

 


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Fig. 4. Transect shallow (A/E horizons) and deep ground water (C horizon) water table elevations at Lake Creek West and East on (a) and (b) 30 Oct. 1995, (b) and (c) 21 Jan. 1997, (e) and (f) 14 Apr. 1997, and (g) and (h) 2 June 1997.

 


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Fig. 5. Platinum electrode potential of A-horizon soil in (a) the grass seed field (FLD) and (c) noncultivated riparian zone (NCR) at Lake Creek West and (b) FLD and (d) cultivated riparian zone (CR) at Lake Creek East.

 





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