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Document: Nitrogen removal by streams and rivers of the Upper Mississippi River basin (Doc-52)

52
Authors
Hill, B. and Bolgrien, D.
Year
2011
Title
Nitrogen removal by streams and rivers of the Upper Mississippi River basin
Document Type
Journal Article
Journal
Biogeochemistry
Volume
102
Issue
1
Pages
183-194
Abstract
We used stream chemistry and hydrogeomorphology data from 549 stream and 447 river sites to estimate NO 3 –N removal in the Upper Mississippi, Missouri, and Ohio Rivers. We used two N removal models to predict NO 3 –N input and removal. NO 3 –N input ranged from 0.01 to 338 kg km −1 d −1 in the Upper Mississippi River to <0.01–54 kg km −1 d −1 in the Missouri River. Cumulative river network NO 3 –N input was 98700–101676 Mg year −1 in the Ohio River, 85961–89288 Mg year −1 in the Upper Mississippi River, and 59463–61541 Mg year −1 in the Missouri River. NO 3 –N output was highest in the Upper Mississippi River (0.01–329 kg km −1 d −1 ), followed by the Ohio and Missouri Rivers (<0.01–236 kg km −1 d −1 ) sub-basins. Cumulative river network NO 3 –N output was 97499 Mg year −1 for the Ohio River, 84361 Mg year −1 for the Upper Mississippi River, and 59200 Mg year −1 for the Missouri River. Proportional NO 3 –N removal (PNR) based on the two models ranged from <0.01 to 0.28. NO 3 –N removal was inversely correlated with stream order, and ranged from <0.01 to 8.57 kg km −1 d −1 in the Upper Mississippi River to <0.001–1.43 kg km −1 d −1 in the Missouri River. Cumulative river network NO 3 –N removal predicted by the two models was Upper Mississippi River 4152 and 4152 Mg year −1 , Ohio River 3743 and 378 Mg year −1 , and Missouri River 2277 and 197 Mg year −1 . PNR removal was negatively correlated with both stream order ( r = −0.80–0.87) and the percent of the catchment in agriculture ( r = −0.38–0.76).
URL Exit
http://dx.doi.org/10.1007/s10533-010-9431-8
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