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dc.contributor.authorBallou, Nellie B.
dc.date.accessioned2020-10-15T22:25:40Z
dc.date.available2020-10-15T22:25:40Z
dc.date.issued2011-05
dc.identifier.urihttp://hdl.handle.net/11122/11350
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2011en_US
dc.description.abstractFollowing the application of glyphosate in the formulation of AquaMaster® at two contrasting sub-arctic zones along the railroad corridor in Alaska, attenuation of the herbicide glyphosate was investigated. Study sites were established in continental and coastal zones. Glyphosate soil attenuation was similar to temperate regions during the growing season but exhibited an extended persistence during the winter months. Although glyphosate microbial degradation likely slowed during winter, both sites showed evidence of slight glyphosate degradation during the winter months. The coastal site attenuated more rapidly than the continental site which is presumably due to increased rainfall relative to the continental site. Glyphosate attenuation at the coastal site was likely driven by dispersion while microbial degradation was responsible for the attenuation of glyphosate at the continental site. Movement to subsurface soils (10-25 cm) at low concentrations was observed at both sites with slightly more transport at the coastal site than the continental site. Glyphosate transport to groundwater along railroad corridors was not conclusive. Vegetation cover reduction was reduced at the continental site but could not be determined at the coastal site.en_US
dc.description.tableofcontents1. Introduction -- 1.1. Project scope -- 1.2. Methodology overview -- 2. Glyphosate background -- 2.1. Glyphosate -- 2.2. Properties of glyphosate -- 2.3. Glyphosate in the environment -- 2.3.1. Vegetation of uptake, translocation and metabolism -- 2.3.2. Mode of action -- 2.3.3. Fate in soil -- 2.3.3.1. Sorption -- 2.3.3.1. Movement -- 2.3.4. Degradation and persistence -- 2.3.5. Fate in aquatic environments -- 2.3.6. Atmosphere -- 2.3.7. Glyphosate in cold climates -- 3. Materials and methods -- 3.1. Site descriptions -- 3.1.1. Continental study site description -- 3.1.2. Coastal study site description -- 3.2. Field experiment -- 3.3. Analytical methods -- 3.3.1. GC methodology and analysis -- 3.4. LC methodology and analysis -- 4. Results and discussion -- 4.1. Continental site results and discussion -- 4.1.1. Continental site glyphosate -- 4.1.2. Continental site AMPA -- 4.1.3. Continental site glyphosate mass -- 4.2. Coastal site results and discussion -- 4.2.1. Coastal site glyphosate -- 4.2.2. Coastal stie AMPA -- 4.2.3. LC soil and water results and discussion -- 4.3. Comparison of GC coastal results and continental results -- 4.4. Vegetation efficacy results -- 5. Conclusions -- 5.1. Future research needs -- References -- Appendices.en_US
dc.language.isoen_USen_US
dc.subjectrailroad tracksen_US
dc.subjectweed controlen_US
dc.subjectAlaskaen_US
dc.subjectrailroad plantsen_US
dc.subjectglyphosateen_US
dc.subjectbiodegradationen_US
dc.subjectenvironmenten_US
dc.titleAttenuation of the herbicide glyphosate along railroad corridors in Alaskaen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Civil and Environmental Engineeringen_US
refterms.dateFOA2020-10-15T22:25:41Z


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