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Mitigation of Shallow Groundwater Nitrate in a Poorly Drained Riparian Area and Adjacent Cropland

^a USDA-ARS, 3450 SW Campus Way, Corvallis, OR 97331
^b Dep. LAWR, Univ. of California, Davis, CA 95616
^c Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331

View larger version (31K): [in this window] [in a new window]   Fig. 1. Location of the study site in Linn County, OR and placement of three transects of wells, running perpendicular to the stream from the cropping system through the riparian area to Lake Creek.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Closed-headspace well showing (a) inlet for the introduction of Argon gas, (b) water sample collection tube, (c) plastic compression fitting, (d) screw top to well, (e) 15 cm screening (Baham et al., 1999).

View larger version (22K): [in this window] [in a new window]   Fig. 3. Mean and standard error of nitrate concentrations in the soil pore water of the A and C horizons of the riparian area and cropping system.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Nitrate concentrations in open-headspace wells installed in the fall of 1998 between rows 4 (riparian) and 5 (cropping system) on the center transect.

View larger version (13K): [in this window] [in a new window]   Fig. 5. Mean and standard error of chloride concentrations in the soil pore water of the A and C horizons during water year 1998–1999.

View larger version (24K): [in this window] [in a new window]   Fig. 6. Mean and standard error of dissolved organic carbon (DOC) concentrations in the soil pore water of the A and C horizons of the riparian area and cropping system.

View larger version (18K): [in this window] [in a new window]   Fig. 7. Mean and standard error of dissolved oxygen concentrations in the soil pore water of the A and C horizons of the riparian area and cropping system.

View larger version (19K): [in this window] [in a new window]   Fig. 8. Mean and standard error of dissolved nitrous oxide concentrations in the soil pore water of the A and C horizons of the riparian area and cropping system.

View larger version (18K): [in this window] [in a new window]   Fig. 9. Mean and standard error of dissolved inorganic carbon concentrations in the soil pore water of the A and C horizons of the riparian area and cropping system.