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Permanent link (DOI): https://doi.org/10.7939/R3466F

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Quantification of deep drainage flux and drainage water quality characterization below the root zone of a short rotation coppice of willow and poplar receiving municipal treated wastewater irrigation in the lower foothills natural subregion of Alberta Open Access

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Other title
Subject/Keyword
Short rotation coppice
nitrate leaching
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Gainer, Amy E.
Supervisor and department
Miles Dyck (Renewable Resources, University of Alberta) and Gary Kachanoski (Presidents Office, Memorial University)
Examining committee member and department
Evan Davies (Civil Engineering and Enviornmental Engineering)
Gary Kachanoski (Presidents Office, Memorial University)
Miles Dyck (Renewable Resources)
Department
Department of Renewable Resources
Specialization
Soil Science
Date accepted
2012-03-28T08:29:26Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
Short rotation coppice is a type of bio-energy that involves the management of woody species to be harvested for energy purposes. Short rotation coppice in combination with municipal treated wastewater irrigation offers various benefits, mainly a low cost form of both nutrients and irrigation water. However, wastewater contains plant essential nutrients that can impact groundwater if the systems are mismanaged, i.e. nitrate. To prevent soil salinization from occurring in the root zone, a leaching fraction (LF) is applied. Leaching fraction is the fraction of surface infiltrated water that drains past the root zone. The research objectives involve quantifying and qualifying drainage in a fine textured soil below a SRC with wastewater irrigation system. Drainage was estimated under the wastewater irrigated soil and non-irrigated soil (control) using two methods, the soil water balance and a model based on the chloride mass balance by Rose et al (1979). The drainage in 2010 and 2011 using the water balance was -9.2 and 28 cm, respectively, and the model results were -18.5 and 11.7 cm, respectively. Drainage quality was monitored over 2010 and 2011 for nitrate-N, orthophosphate-P and other solutes using soil solution samplers and a transport model by Schoups and Hopmans (2002). Solute loading rates to groundwater were greater under the wastewater irrigated soil than the control. Nitrate-N in the soil solution at 150 cm below ground surface for both monitoring years never exceeded either the potable water guidelines (10 mg L-1), however, these years had relatively low irrigation amounts and the Schoups and Hopman (2002) model predicted soil solution nitrate-N concentration in exceedance of potable water guidelines at LF’s above about 0.55. Based on the findings from this research, it is recommended to use a LF between 0.2 and 0.5 to protect groundwater users, prevent soil salinization and utilize the large supply of municipal treated wastewater available.
Language
English
DOI
doi:10.7939/R3466F
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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