Streams in the midwestern United States are managed to rapidly convey runoff downstream, carrying with it nutrients and sediment. My thesis quantifies the effect of the two-stage ditch, which constructs ‘mini-floodplains’ adjacent to channelized streams to 1) retain nutrients and sediment, and 2) enhance ecosystem function. The two-stage ditch increased water clarity during floodplain inundation; however, total suspended solids were not reduced in any of the study streams. Nutrients that are ‘sticky’ (total phosphorus, soluble phosphorus, and ammonium) were decreased in 2 of the 4 two-stage reaches, whereas nitrate, a ‘leaky’ nutrient, was not reduced in any of the streams. Floodplains increased gross primary production during warm seasons at baseflow, and consistently increased ecosystem respiration at all stages in all seasons. Constructed floodplains can improve water quality in agricultural streams, but is most likely to be successful when ‘stacked’ with other best management practices within a watershed.
|Advisor:||Tank, Jennifer L.|
|Commitee:||Jones, Stuart, Lamberti, Gary|
|School:||University of Notre Dame|
|School Location:||United States -- Indiana|
|Source:||MAI 54/03M(E), Masters Abstracts International|
|Keywords:||Floodplain, Midwest United States, Nutrients, Streams, Two-stage ditch, Whole-stream metabolism|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be