Phosphorus source--sink relationships of stream sediments in the Rathbun Lake watershed in southern Iowa, USA

dc.contributor.author Hongthanat, Najphak
dc.contributor.author Kovar, John
dc.contributor.author Thompson, Michael
dc.contributor.author Russell, James
dc.contributor.author Isenhart, Thomas
dc.contributor.department Department of Animal Science
dc.contributor.department Natural Resource Ecology and Management
dc.contributor.department Department of Agronomy
dc.contributor.department Iowa Nutrient Research Center
dc.date 2018-02-19T07:29:48.000
dc.date.accessioned 2020-06-30T06:12:46Z
dc.date.available 2020-06-30T06:12:46Z
dc.date.issued 2016-08-01
dc.description.abstract <p>The surface waters of Rathbun Lake watershed in southern Iowa are impacted by agricultural sources of sediments and nutrients, including phosphorus (P). Because stream sediments often play an important role in regulating P concentrations in stream water, we investigated sediment-water column P relationships in four creeks within the watershed and then evaluated the relationship between sediment properties and indicators of the risk of P loss. Based on Mehlich-3-extractable P (17 to 68 mg kg -1) and degree of P saturation (2 to 12 %), stream bank and bed sediments at the four sites were unlikely to serve as major sources of P. However, equilibrium P concentrations, which ranged from 0.02 to 0.12 mg L-1, indicated that bed sediments could release P to the water column depending on dissolved P (DP) concentrations in the stream water and the time of year. The likelihood of P desorption from the sediments increased with increasing pH (r=0.92, p < 0.01) and sand content (r = 0.78, p < 0.05), but decreased with clay content (r = −0.72, p < 0.05) and iron (Fe) (r = −0.93, p < 0.001) associated with organic matter. From these results, we speculate that changes in land use within the riparian areas may, at least initially, have little effect on P concentrations in the streams. Low concentrations of DP relative to total P (TP) in these streams, however, suggest that P loads to Rathbun Lake can be reduced if P inputs from eroded bank sediments are controlled.</p>
dc.description.comments <p>This article is published as Hongthanat, Najphak, John L. Kovar, Michael L. Thompson, James R. Russell, and Thomas M. Isenhart. "Phosphorus source—sink relationships of stream sediments in the Rathbun Lake watershed in southern Iowa, USA." Environmental monitoring and assessment 188, no. 8 (2016): 1-14. doi: <a href="http://dx.doi.org/10.1007" target="_blank">10.1007/s10661-016-5437-6</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/nrem_pubs/261/
dc.identifier.articleid 1270
dc.identifier.contextkey 11370028
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath nrem_pubs/261
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/56281
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/nrem_pubs/261/2016_Isenhart_PhosphorousSource.pdf|||Fri Jan 14 23:02:12 UTC 2022
dc.source.uri 10.1007/s10661-016-5437-6
dc.subject.disciplines Natural Resources and Conservation
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.disciplines Sedimentology
dc.subject.keywords Stream sediments
dc.subject.keywords Riparian pastures
dc.subject.keywords Phosphorus losses
dc.subject.keywords Degree of P saturation
dc.subject.keywords equilibrium P concentration
dc.title Phosphorus source--sink relationships of stream sediments in the Rathbun Lake watershed in southern Iowa, USA
dc.type article
dc.type.genre article
dspace.entity.type Publication
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