NUTRIENTS IN STREAMS DURING BASEFLOW IN SELECTED ENVIRONMENTAL SEVFINGS OF THE POTOMAC RiVER BASIN
Identifieur interne : 001236 ( Istex/Corpus ); précédent : 001235; suivant : 001237NUTRIENTS IN STREAMS DURING BASEFLOW IN SELECTED ENVIRONMENTAL SEVFINGS OF THE POTOMAC RiVER BASIN
Auteurs : Cherie V. Miller ; Janet M. Denis ; Scott W. Ator ; John W. BrakebillSource :
- JAWRA Journal of the American Water Resources Association [ 1093-474X ] ; 1997-12.
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Abstract
ABSTRACT: A regional assessment of water quality in small streams was conducted within four areas of distinct physiography and lithology in the upper Potomac River Basin. The Potomac River is a major tributary to the Chesapeake Bay, and this study provides new insight on the relationships between nutrient concentrations in small streams and watershed characteristics within this river basin. Nutrient concentrations were compared to land‐use data including categories for agriculture (cropland and pasture), urban areas, and forests. Among agricultural areas, streams draining areas of intense row cropping typically contained higher nitrate concentrations than did those draining pastures. Streams draining forested areas typically had the lowest nutrient concentrations. Streams in areas underlain by carbonate bedrock were more likely to contain elevated concentrations of inorganic nitrogen and potassium than did streams in areas underlain by fractured siliciclastic or crystalline rocks, and we suggest that this is a physical phenomenon related to high hydraulic conductivities in carbonate ground‐water systems. The median nitrate concentrations were highest in the Great Valley portion of the Valley and Ridge physiographic province, particularly in watersheds that have both carbonate bedrock and intensive row cropping. Values of nitrate in these streams ranged up to 8.99 mg/L as nitrogen. The soluble phosphorus concentrations during baseflow were generally low in all sub‐units, even in some settings with potential for high phosphorus inputs such as urban areas with municipal point sources or agricultural areas. The mobility of phosphorus in these environments may be hindered by adsorption and geochemical reactions.
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DOI: 10.1111/j.1752-1688.1997.tb03543.x
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<front><div type="abstract">ABSTRACT: A regional assessment of water quality in small streams was conducted within four areas of distinct physiography and lithology in the upper Potomac River Basin. The Potomac River is a major tributary to the Chesapeake Bay, and this study provides new insight on the relationships between nutrient concentrations in small streams and watershed characteristics within this river basin. Nutrient concentrations were compared to land‐use data including categories for agriculture (cropland and pasture), urban areas, and forests. Among agricultural areas, streams draining areas of intense row cropping typically contained higher nitrate concentrations than did those draining pastures. Streams draining forested areas typically had the lowest nutrient concentrations. Streams in areas underlain by carbonate bedrock were more likely to contain elevated concentrations of inorganic nitrogen and potassium than did streams in areas underlain by fractured siliciclastic or crystalline rocks, and we suggest that this is a physical phenomenon related to high hydraulic conductivities in carbonate ground‐water systems. The median nitrate concentrations were highest in the Great Valley portion of the Valley and Ridge physiographic province, particularly in watersheds that have both carbonate bedrock and intensive row cropping. Values of nitrate in these streams ranged up to 8.99 mg/L as nitrogen. The soluble phosphorus concentrations during baseflow were generally low in all sub‐units, even in some settings with potential for high phosphorus inputs such as urban areas with municipal point sources or agricultural areas. The mobility of phosphorus in these environments may be hindered by adsorption and geochemical reactions.</div>
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<abstractGroup><abstract type="main" xml:lang="en"><p><b>ABSTRACT: </b>
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<p>Paper No. 96179 of the <i>Journal of the American Water Resources Association</i>
(formerly <i>Water Resources Bulletin</i>
). Discussions are open until August 1, 1998.</p>
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<mods version="3.6"><titleInfo lang="en"><title>NUTRIENTS IN STREAMS DURING BASEFLOW IN SELECTED ENVIRONMENTAL SEVFINGS OF THE POTOMAC RiVER BASIN</title>
</titleInfo>
<titleInfo type="alternative" contentType="CDATA" lang="en"><title>NUTRIENTS IN STREAMS DURING BASEFLOW IN SELECTED ENVIRONMENTAL SEVFINGS OF THE POTOMAC RiVER BASIN1</title>
</titleInfo>
<name type="personal"><namePart type="given">Cherie V.</namePart>
<namePart type="family">Miller</namePart>
<affiliation>Respectively, Hydrologists and Geographer, U.S. Geological Survey, Water Resources Division, 8987 Yellow Brick Road, Baltimore, Maryland 21237.</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">Janet M.</namePart>
<namePart type="family">Denis</namePart>
<affiliation>Respectively, Hydrologists and Geographer, U.S. Geological Survey, Water Resources Division, 8987 Yellow Brick Road, Baltimore, Maryland 21237.</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">Scott W.</namePart>
<namePart type="family">Ator</namePart>
<affiliation>Respectively, Hydrologists and Geographer, U.S. Geological Survey, Water Resources Division, 8987 Yellow Brick Road, Baltimore, Maryland 21237.</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">John W.</namePart>
<namePart type="family">Brakebill</namePart>
<affiliation>Respectively, Hydrologists and Geographer, U.S. Geological Survey, Water Resources Division, 8987 Yellow Brick Road, Baltimore, Maryland 21237.</affiliation>
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<genre type="article" displayLabel="article"></genre>
<originInfo><publisher>Blackwell Publishing Ltd</publisher>
<place><placeTerm type="text">Oxford, UK</placeTerm>
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<dateIssued encoding="w3cdtf">1997-12</dateIssued>
<copyrightDate encoding="w3cdtf">1997</copyrightDate>
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<language><languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<extent unit="references">49</extent>
</physicalDescription>
<abstract>ABSTRACT: A regional assessment of water quality in small streams was conducted within four areas of distinct physiography and lithology in the upper Potomac River Basin. The Potomac River is a major tributary to the Chesapeake Bay, and this study provides new insight on the relationships between nutrient concentrations in small streams and watershed characteristics within this river basin. Nutrient concentrations were compared to land‐use data including categories for agriculture (cropland and pasture), urban areas, and forests. Among agricultural areas, streams draining areas of intense row cropping typically contained higher nitrate concentrations than did those draining pastures. Streams draining forested areas typically had the lowest nutrient concentrations. Streams in areas underlain by carbonate bedrock were more likely to contain elevated concentrations of inorganic nitrogen and potassium than did streams in areas underlain by fractured siliciclastic or crystalline rocks, and we suggest that this is a physical phenomenon related to high hydraulic conductivities in carbonate ground‐water systems. The median nitrate concentrations were highest in the Great Valley portion of the Valley and Ridge physiographic province, particularly in watersheds that have both carbonate bedrock and intensive row cropping. Values of nitrate in these streams ranged up to 8.99 mg/L as nitrogen. The soluble phosphorus concentrations during baseflow were generally low in all sub‐units, even in some settings with potential for high phosphorus inputs such as urban areas with municipal point sources or agricultural areas. The mobility of phosphorus in these environments may be hindered by adsorption and geochemical reactions.</abstract>
<note type="content">*Paper No. 96179 of the Journal of the American Water Resources Association (formerly Water Resources Bulletin). Discussions are open until August 1, 1998.</note>
<subject lang="en"><genre>keywords</genre>
<topic>water quality</topic>
<topic>land use</topic>
<topic>nutrients</topic>
<topic>phosphorus</topic>
<topic>nitrogen</topic>
<topic>Potomac River</topic>
<topic>streams</topic>
<topic>surface water</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>6</number>
</detail>
<extent unit="pages"><start>1155</start>
<end>1171</end>
<total>17</total>
</extent>
</part>
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<identifier type="istex">20C6E34B6CCA776AC6D6B40CD3FED26941700BEF</identifier>
<identifier type="DOI">10.1111/j.1752-1688.1997.tb03543.x</identifier>
<identifier type="ArticleID">JAWR1155</identifier>
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<recordOrigin>Blackwell Publishing Ltd</recordOrigin>
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