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https://hdl.handle.net/11681/4380
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DC Field | Value | Language |
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dc.contributor | Metropolitan Council of the Twin Cities Area | - |
dc.contributor | Water Operations Technical Support Program (U.S.) | - |
dc.contributor.author | James, William F., Aquatic biologist | - |
dc.contributor.author | Barko, John W. | - |
dc.contributor.author | Eakin, Harry L. | - |
dc.date.accessioned | 2016-03-16T19:36:05Z | - |
dc.date.available | 2016-03-16T19:36:05Z | - |
dc.date.issued | 1995-12 | - |
dc.identifier.uri | http://hdl.handle.net/11681/4380 | - |
dc.description | Technical Report | - |
dc.description | Abstract: This study examined rates of internal phosphorus (P) loading from sediments in Lake Pepin, a natural impoundment located on the upper Mississippi River. Laboratory determinations of rates of P release from the sediment, measured using intact sediment core systems, were very high, with mean values ranging from 3.8 to 15 mg m⁻² day⁻¹ under oxic and anoxic conditions, respectively. Independently determined Fickean diffusional fluxes (mean of 4.9 mg m⁻² day⁻¹), measured in situ under oxic conditions using sediment peepers, were not statistically different from those rates determined in the laboratory under similar temperature, pH, and oxygen conditions. The dominant inorganic P fractions in the sediments were NaOH-extractable P followed closely by HCl-extractable P. Under both oxic and anoxic conditions, significant correlations existed between rates of P release and the NH4Cl- and NaOH-extractable P fractions, suggesting that loosely bound and iron- and aluminum-bound sediment P contributed to P release from the sediments in this lake. Correlations between total sediment P and extractable sediment P fractions indicated that loosely bound and iron- and aluminum-bound P increased, while calcium-bound P decreased, with increasing total P content of the sediment. Results suggest that internal P loading from the sediments under oxic as well as anoxic conditions can play a very important role in the P economy of this system. | - |
dc.publisher | Environmental Laboratory (U.S.) | - |
dc.publisher | Engineer Research and Development Center (U.S.) | - |
dc.relation | http://acwc.sdp.sirsi.net/client/en_US/search/asset/1040901 | - |
dc.rights | Approved for public release; distribution is unlimited. | - |
dc.source | This Digital Resource was created from scans of the Print Resource | - |
dc.subject | Anoxia | - |
dc.subject | Phosphorus | - |
dc.subject | Porewater phosphorus | - |
dc.subject | Water quality | - |
dc.subject | Sediment | - |
dc.subject | Sediment phosphorus fractions | - |
dc.subject | Lake Pepin | - |
dc.title | Internal phosphorus loading in Lake Pepin (Minnesota-Wisconsin) | - |
dc.type | Report | en_US |
Appears in Collections: | Technical Report |
Files in This Item:
File | Description | Size | Format | |
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TR-W-95-3.pdf | 3.31 MB | Adobe PDF | View/Open |