Relative Effects of Land Use and Near-Stream Chemistry on Phosphorus in an Urban Stream

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dc.contributor.authorSonoda, Kazuhiro
dc.contributor.authorYeakley, Alan
dc.date.accessioned2018-02-21T17:48:14Z
dc.date.available2018-02-21T17:48:14Z
dc.date.issued2007
dc.description.abstractElevated levels of P in urban streams can pose significant water quality problems. Sources of P in urban streams, however, are difficult to identify. It is important to recognize both natural and anthropogenic sources of P. We investigated near-stream chemistry and land use factors on stream water P in the urbanizing Johnson Creek watershed in Portland, OR, USA. We sampled stream water and shallow groundwater soluble reactive P (SRP) and total P (TP) and estimated P flux at 13 sites along the main stem of Johnson Creek, with eight sites in urban land use areas and five sites in nonurban land use areas. At each site, we sampled the A and B horizons, measuring soil pH, water-soluble P, acid-soluble P, base-soluble P, total P, Fe, and Al. We found continuous input of P to the stream water via shallow groundwater throughout the Johnson Creek watershed. The shallow groundwater P concentrations were correlated with stream water P within the nonurban area; however, this correlation was not found in the urban area, suggesting that other factors in the urban area masked the relationship between groundwater P and stream water P. Aluminum and Fe concentrations were inversely correlated with shallow groundwater P, suggesting that greater P adsorption to Al and Fe oxides in the nonurban area reduced availability of shallow groundwater P. Using stepwise multiple regression analysis, however, we concluded that while riparian soil chemistry was related to stream water P, land use patterns had a more significant relationship with stream water P concentrations in this urbanizing system.en_US
dc.identifierdoi:10.13016/M2X05XF2W
dc.identifier.citationJ. Alan Yeakley and Kazuhiro Sonoda. "Relative Effects of Land Use and Near-Stream Chemistry on Phosphorus in an Urban Stream" Journal of Environmental Quality Vol. 36 Iss. 1 (2007) Available at: http://works.bepress.com/j_yeakley/17/en_US
dc.identifier.urihttp://hdl.handle.net/11603/7808
dc.publisherACSESS Digital Libraryen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Geography and Environmental Systems Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjecturban streamsen_US
dc.subjectwater qualityen_US
dc.subjectsources of phosphorus in streamsen_US
dc.subjectJohnson Creek, Oregon watersheden_US
dc.titleRelative Effects of Land Use and Near-Stream Chemistry on Phosphorus in an Urban Streamen_US
dc.typeCollectionen_US

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