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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/30/5/1587
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https://dl.sciencesocieties.org/publications/jeq/articles/30/5/1587
Last checked: 12/14/2016
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | McDowell, Richard;
Sharpley, Andrew;
Folmar, Gordon |
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| Author Affiliation: | McDowell and Folmar: USDA-ARS, Pasture Systems and Watershed Management Research Unit, University Park, PA; Sharpley: Corresponding author |
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| Title: | Phosphorus export from an agricultural watershed: Linking source and transport mechanisms |
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| Section: | Landscape and watershed processes
Other records with the "Landscape and watershed processes" Section
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| Source: | Journal of Environmental Quality. Vol. 30, No. 5, September/October 2001, p. 1587-1595. |
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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: | 9 |
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| Keywords: | TIC Keywords: Phosphorus; Watersheds; Water quality; Streams; Sedimentation; Resorption; Environmental stewardship; Erosion control
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| Abstract/Contents: | "Many source and transport factors control P loss from agricultural landscapes; however, little information is available on how these factors are linked at a watershed scale. Thus, we investigated mechanisms controlling P release from soil and stream sediments in relation to storm and baseflow P concentrations at four flumes and in the channel of an agricultural watershed. Baseflow dissolved reactive phosphorous (DRP) concentrations were greater at the watershed outflow (Flume 1; 0.042 mg L-1) than uppermost flume (Flume 4; 0.028 mg L-1). Conversly, DRP concentrations were greater at Flume 4 (0.304 mg L-1) than Flume 1 (0.128 mg L-1) during stormflow. Similar trends in total phosphorous (TP) concentration were also observed. During stormflow, stream P concentrations are controlled by overland flow-generated erosion from areas of the watershed conincident with high soil P. In-channel decreases in P concentration during stormflow were attributed to sediment deposition, resorption of P, and dilution. The increase in baseflow P concentrations downstream was controlled by channel sediments. Phosphorous sorption maximum of Flume 4 sediment (532 mg kg-1) was greater than at the outlet Flume 1 (227 mg kg-1). Indeed, the decrease in P desorption between Flumes 1 and 4 sediment (0.046 to 0.025 mg L-1) was similar to the difference in baseflow DRP between Flumes 1 and 4 (0.042 to 0.028 mg L-1). This study shows that erosion, soil P concentration, and channel sediment P sorption properties influence stream flow DRP and TP. A better understanding of the spatial and temporal distribution of these processes and their connectivity over the landscape will aid targeting remedial practices." |
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| Language: | English |
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| References: | 29 |
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| Note: | Tables
Graphs
Maps |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McDowell, R., A. Sharpley, and G. Folmar. 2001. Phosphorus export from an agricultural watershed: Linking source and transport mechanisms. J. Environ. Qual. 30(5):p. 1587-1595. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/30/5/1587
Last checked: 12/14/2016
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Access conditions: Item is within a limited-access website
https://dl.sciencesocieties.org/publications/jeq/articles/30/5/1587
Last checked: 12/14/2016
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 900 .J6 |
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