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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/26/2/JEQ0260020337
Last checked: 12/12/2016
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| Publication Type:
| Refereed |
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| Author(s): | Verchot, Louis V.;
Franklin, E. Carlyle;
Gilliam, J. Wendell |
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| Author Affiliation: | Verchot, Woods Hole Res. Ctr., P.O. Box 296, Woods Hole, MA 02543; Franklin, Forestry Dep., Box 8006 North Carolina State Univ., Raleigh, NC 27695-8006; Gilliam, Soils Dep., Box 7619, North Carolina State Univ., Raleigh, NC 27695-7619 |
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| Title: | Nitrogen cycling in Piedmont vegetated filter zones: II. subsurface nitrate removal |
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| Section: | Water quality
Other records with the "Water quality" Section
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| Source: | Journal of Environmental Quality. Vol. 26, No. 2, March/April 1997, p. 337-347. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Nitrogen; Poa pratensis; Denitrification; Nitrate losses; Nitrogen cycle; Groundwater; Water quality; Filter strips; Watersheds
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| Abstract/Contents: | "Subsurface flow often constitutes the major pathway for movement of dissolved nutrients such as NO₃-N from agricultural fields. The objectives of this study were (i) to determine the changes in shallow groundwater chemistry along a piezometric gradient from agricultural fields, across grass-vegetated field edges and through adjacent forest on two Piedmont watersheds and (ii) determine the relative importance of dilution, dentrification, and plant uptake in subsurface NO₃ attenuation. We monitored changes in groundwater chemistry at three depths along a piezometric gradient from an agricultural field through a grass field edge and through a forested filter zone (FFZ). We measured a marked decrease in nitrate concentrations from 8 to 10 mg ⁻¹ at the field edge to almost 0 at the forest edge; CI concentrations remained within the range of 8 to 10 mg ⁻¹, suggesting that dilution was not an important factor in NO₃ concentration reductions. At a third site, we introduced NO₂-N and a conservative tracer, bromide, into the soil profile at both the grass-vegetated field border and the forested area, to determine mechanisms responsible for the observed decrease in NO₃-N concentrations. Using ion concentration ratios we determined that nitrate attenuation in the grass-vegetated field edge was low compared to the forest. Nitrate loss in the forest was almost exclusively through denitrification; plant uptake was insignificant in these experiments. Although grass-vegetated field borders were less effective than riparian forests at NO₃-N removal, considerable reductions were observed in these areas on the experimental watersheds. Similar reductions would be expected over shorter distances in riparian forests." |
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| Language: | English |
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| References: | 27 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Verchot, L. V., E. C. Franklin, and J. W. Gilliam. 1997. Nitrogen cycling in Piedmont vegetated filter zones: II. subsurface nitrate removal. J. Environ. Qual. 26(2):p. 337-347. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/26/2/JEQ0260020337
Last checked: 12/12/2016
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Notes: Item is within a limited-access website |
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MSU catalog number: S 900 .J6 |
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