NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN
Identifieur interne : 000B82 ( Istex/Corpus ); précédent : 000B81; suivant : 000B83NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN
Auteurs : N. E. Spahr ; K H. WynnSource :
- 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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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. 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Wynn</name><affiliations><json:string>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>water quality</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>nutrients</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>nitrogen</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>phosphorus</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Colorado River</value></json:item></subject><articleId><json:string>JAWR547</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><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. 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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. 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E.</givenNames><familyName>Spahr</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a1"><personName><givenNames>K H.</givenNames><familyName>Wynn</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="US"><unparsedAffiliation>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">water quality</keyword><keyword xml:id="k2">nutrients</keyword><keyword xml:id="k3">nitrogen</keyword><keyword xml:id="k4">phosphorus</keyword><keyword xml:id="k5">Colorado River</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>ABSTRACT: </b> 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.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn1"><label>1</label><p>Paper No. 96023 of the <i>Journal of the American Water Resources Association</i> (formerly <i>Water Resources Bulletin</i>). <b>Discussions are open until December 1, 1997</b>.</p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>NITROGEN AND PHOSPHORUS IN SURFACE WATERS OF THE UPPER COLORADO RWER BASIN1</title></titleInfo><name type="personal"><namePart type="given">N. E.</namePart><namePart type="family">Spahr</namePart><affiliation>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">K H.</namePart><namePart type="family">Wynn</namePart><affiliation>Hydrologists, U.S. Geological Survey, Colorado District, MS 415, Box 25046, Denver Federal Center, Lakewood, Colorado 80225.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">1997-06</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="references">23</extent></physicalDescription><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.</abstract><note type="content">*Paper No. 96023 of the Journal of the American Water Resources Association (formerly Water Resources Bulletin). Discussions are open until December 1, 1997.</note><subject lang="en"><genre>keywords</genre><topic>water quality</topic><topic>nutrients</topic><topic>nitrogen</topic><topic>phosphorus</topic><topic>Colorado River</topic></subject><relatedItem type="host"><titleInfo><title>JAWRA Journal of the American Water Resources Association</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1093-474X</identifier><identifier type="eISSN">1752-1688</identifier><identifier type="DOI">10.1111/(ISSN)1752-1688</identifier><identifier type="PublisherID">JAWR</identifier><part><date>1997</date><detail type="volume"><caption>vol.</caption><number>33</number></detail><detail type="issue"><caption>no.</caption><number>3</number></detail><extent unit="pages"><start>547</start><end>560</end><total>14</total></extent></part></relatedItem><identifier type="istex">D22E4CCFA9CCE7177E43F84967323A84DE7D75FD</identifier><identifier type="DOI">10.1111/j.1752-1688.1997.tb03531.x</identifier><identifier type="ArticleID">JAWR547</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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