Nitrate-N load reduction measured in a central Iowa restored oxbow

Keith E. Schilling; Keegan Kult; Anthony Seemon; Karen Wilke; Christopher S. Jones

doi:10.1016/j.ecoleng.2018.09.018

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Nitrate-N load reduction measured in a central Iowa restored oxbow

Journal article

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Nitrate-N load reduction measured in a central Iowa restored oxbow

Keith E. Schilling, Keegan Kult, Anthony Seemon, Karen Wilke and Christopher S. Jones

Ecological engineering, Vol.124, pp.19-22

12/01/2018

DOI: 10.1016/j.ecoleng.2018.09.018

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Abstract

This short communication presents new data collected from a tile-fed oxbow site in north-central Iowa and reports on the quantification of NO3-N load reductions using a mass balance approach. Using improved monitoring equipment deployed at the site in 2017, including a continuously-reading nitrate sensor, a NO3-N budget for the oxbow was developed to estimate annual and monthly load reductions occurring in the reconstructed oxbow. Daily NO3-N input was primarily from two drainage tiles and concentrations in the oxbow ranged from <0.2 to 3.5 mg/l. Based on daily mass balance, the oxbow retained 42.3 kg of NO3-N, or 0.21 g N m−2 d−1, and the NO3-N retention efficiency was 35.4%. Removal efficiencies in early spring and late summer and fall were much higher than late spring and early summer. Based on mass load reductions, the effectiveness of oxbows for N load reductions is greatest when oxbows receive greater N loads from tile drainage compared to N loads delivered from flood pulses.

Floodplain

Mass balance

Nitrate-nitrogen

Nutrient reduction

Oxbow

Details

Title: Subtitle: Nitrate-N load reduction measured in a central Iowa restored oxbow
Creators: Keith E. Schilling - Iowa Geological Survey, Trowbridge Hall, University of Iowa, Iowa City, IA, United States
Keegan Kult - Iowa Soybean Association
Anthony Seemon - Iowa Soybean Association
Karen Wilke - The Nature Conservancy
Christopher S. Jones - University of Iowa
Resource Type: Journal article
Publication Details: Ecological engineering, Vol.124, pp.19-22
DOI: 10.1016/j.ecoleng.2018.09.018
ISSN: 0925-8574
eISSN: 1872-6992
Publisher: Elsevier B.V
Grant note: DOI: 10.13039/100009171, name: Natural Resources Conservation Service; DOI: 10.13039/100000199, name: U.S. Department of Agriculture, award: 69-6114-14-008
Language: English
Date published: 12/01/2018
Academic Unit: Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
Record Identifier: 9984383919402771

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