NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN
Identifieur interne : 000B28 ( Istex/Curation ); précédent : 000B27; suivant : 000B29NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN
Auteurs : N. E. Spahr [États-Unis] ; K H. Wynn [États-Unis]Source :
- JAWRA Journal of the American Water Resources Association [ 1093-474X ] ; 1997-06.
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Abstract
ABSTRACT: As part of a basinwide water‐quality study, nitrogen and phosphorus data for the Upper Colorado River Basin from the Colorado‐Utah State line to the Continental Divide were analyzed for spatial distributions, concentrations associated with various land uses, and temporal trends. Nitrogen and phosphorus concentrations generally increased in a downstream direction. Some nutrient concentrations were elevated at some sites in the upper parts of the basin in areas influenced by increasing urbanization. Sites were grouped according to land use and site type, and median nutrient concentrations were compared among groups. Sites within the agricultural areas of the basin generally had the highest concentrations of nitrogen and phosphorus; concentrations for main‐stem, tributary, and urbanization sites were slightly lower than for the agricultural sites. Background sites, or sites with minimal land‐use impacts, had very low median nutrient concentrations. Several sites with long‐term data were analyzed for temporal trends in concentrations. Several statistically significant downward trends of low and moderate magnitude were observed for nitrogen and phosphorus species. No upward trends were observed in the data at any site.
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DOI: 10.1111/j.1752-1688.1997.tb03531.x
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E." last="Spahr">N. E. Spahr</name><affiliation wicri:level="2"><mods:affiliation>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</mods:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Colorado</region></placeName><wicri:cityArea>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood</wicri:cityArea></affiliation></author><author><name sortKey="Wynn, K H" sort="Wynn, K H" uniqKey="Wynn K" first="K H." last="Wynn">K H. Wynn</name><affiliation wicri:level="2"><mods:affiliation>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</mods:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Colorado</region></placeName><wicri:cityArea>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood</wicri:cityArea></affiliation></author></analytic><monogr></monogr><series><title level="j">JAWRA Journal of the American Water Resources Association</title><idno type="ISSN">1093-474X</idno><idno type="eISSN">1752-1688</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1997-06">1997-06</date><biblScope unit="volume">33</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="547">547</biblScope><biblScope unit="page" to="560">560</biblScope></imprint><idno type="ISSN">1093-474X</idno></series><idno type="istex">D22E4CCFA9CCE7177E43F84967323A84DE7D75FD</idno><idno type="DOI">10.1111/j.1752-1688.1997.tb03531.x</idno><idno type="ArticleID">JAWR547</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1093-474X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Colorado River</term><term>nitrogen</term><term>nutrients</term><term>phosphorus</term><term>water quality</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">ABSTRACT: As part of a basinwide water‐quality study, nitrogen and phosphorus data for the Upper Colorado River Basin from the Colorado‐Utah State line to the Continental Divide were analyzed for spatial distributions, concentrations associated with various land uses, and temporal trends. Nitrogen and phosphorus concentrations generally increased in a downstream direction. Some nutrient concentrations were elevated at some sites in the upper parts of the basin in areas influenced by increasing urbanization. Sites were grouped according to land use and site type, and median nutrient concentrations were compared among groups. Sites within the agricultural areas of the basin generally had the highest concentrations of nitrogen and phosphorus; concentrations for main‐stem, tributary, and urbanization sites were slightly lower than for the agricultural sites. Background sites, or sites with minimal land‐use impacts, had very low median nutrient concentrations. Several sites with long‐term data were analyzed for temporal trends in concentrations. Several statistically significant downward trends of low and moderate magnitude were observed for nitrogen and phosphorus species. No upward trends were observed in the data at any site.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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