Reconnecting Tile Drainage to Riparian Buffer Hydrology for Enhanced Nitrate Removal

dc.contributor.author Jaynes, Dan
dc.contributor.author Isenhart, Thomas
dc.contributor.author Isenhart, Thomas
dc.contributor.department Natural Resource Ecology and Management
dc.date 2018-02-17T00:07:28.000
dc.date.accessioned 2020-06-30T06:12:00Z
dc.date.available 2020-06-30T06:12:00Z
dc.date.issued 2014-03-01
dc.description.abstract <p>Riparian buffers are a proven practice for removing NO<sub>3</sub> from overland flow and shallow groundwater. However, in landscapes with artificial subsurface (tile) drainage, most of the subsurface flow leaving fields is passed through the buffers in drainage pipes, leaving little opportunity for NO<sub>3</sub> removal. We investigated the feasibility of re-routing a fraction of field tile drainage as subsurface flow through a riparian buffer for increasing NO<sub>3</sub> removal. We intercepted an existing field tile outlet draining a 10.1-ha area of a row-cropped field in central Iowa and re-routed a fraction of the discharge as subsurface flow along 335 m of an existing riparian buffer. Tile drainage from the field was infiltrated through a perforated pipe installed 75 cm below the surface by maintaining a constant head in the pipe at a control box installed in-line with the existing field outlet. During 2 yr, >18,000 m<sup>3</sup> (55%) of the total flow from the tile outlet was redirected as infiltration within the riparian buffer. The redirected water seeped through the 60-m-wide buffer, raising the water table approximately 35 cm. The redirected tile flow contained 228 kg of NO<sub>3</sub>. On the basis of the strong decrease in NO<sub>3</sub>concentrations within the shallow groundwater across the buffer, we hypothesize that the NO<sub>3</sub> did not enter the stream but was removed within the buffer by plant uptake, microbial immobilization, or denitrification. Redirecting tile drainage as subsurface flow through a riparian buffer increased its NO<sub>3</sub> removal benefit and is a promising management practice to improve surface water quality within tile-drained landscapes.</p>
dc.description.comments <p>This article is from <em><a href="https://dl.sciencesocieties.org/publications/jeq">Journal of Environmental Quality</a></em> 43 (2014): 631, doi:<a href="http://dx.doi.org/10.2134/jeq2013.08.0331" target="_blank">10.2134/jeq2013.08.0331</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/nrem_pubs/171/
dc.identifier.articleid 1169
dc.identifier.contextkey 7553147
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath nrem_pubs/171
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/56184
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/nrem_pubs/171/2014_Isenhart_ReconnectingTile.pdf|||Fri Jan 14 21:16:03 UTC 2022
dc.source.uri 10.2134/jeq2013.08.0331
dc.subject.disciplines Hydrology
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.keywords Riparian buffer
dc.subject.keywords plant uptake
dc.subject.keywords microbial immobilization
dc.subject.keywords denitrification
dc.title Reconnecting Tile Drainage to Riparian Buffer Hydrology for Enhanced Nitrate Removal
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5302870e-a897-487b-8ca6-2d573294468a
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
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