| Abstract: | One anticipated benefit of ecosystem restoration is water quality improvement. This study evaluated NO3-N and phosphorus in subsurface waters during prairie establishment following decades of row-crop agriculture. A prairie seeding in late 2003 became established in 2006. Wells and suction cup samplers were monitored for NO3-N and phosphorus. Nitrate-N varied with time and landscape position. Non-detectable NO3-N concentrations became modal along ephemeral drainageways in 2006, when average concentrations in uplands first became <10mg NO3-NL-1. This decline continued and upland groundwater averaged near 2mg NO3-NL-1 after 2007. The longer time lag in NO3-N response in uplands was attributed to greater quantities of leachable N in upland subsoils. Spatial differences in vadose-zone travel times were less important, considering water table dynamics. Phosphorus showed a contrasting landscape pattern, without any obvious temporal trend. Phosphorus was greatest along and near ephemeral drainageways. Sediment accumulation from upland agricultural erosion provided a source of P along drainageways, where shallow, reductive groundwater increased P solubility. Phosphorus exceeded eutrophication risk thresholds in these lower areas, where saturation-excess runoff could readily transport P to surface waters. Legacy impacts of past agricultural erosion and sedimentation may include soluble phosphorus in shallow groundwater, at sites prone to saturation-excess runoff. ?? 2010. |
| Genre: | Article |
| ProdID: | 70036204 |
| Citation Author: | Tomer, M. D.; Schilling, K. E.; Cambardella, C. A.; Jacobson, P.; Drobney, P. |
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| Citation End Page: | 213 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Agriculture, Ecosystems and Environment |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Groundwater nutrient concentrations during prairie reconstruction on an Iowa landscape; 2010; Article; Journal; Agriculture, Ecosystems and Environment; Tomer, M. D.; Schilling, K. E.; Cambardella, C. A.; Jacobson, P.; Drobney, P. |
| Citation Start Page: | 206 |
| Citation Volume: | 139 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | Groundwater nutrient concentrations during prairie reconstruction on an Iowa landscape; 2010; Article; Journal; Agriculture, Ecosystems and Environment; Tomer, M. D.; Schilling, K. E.; Cambardella, C. A.; Jacobson, P.; Drobney, P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.agee.2010.08.003 |
| Date Other: | Fri, 1 Jan 2010 00:00 -0600 |
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