The influence of geomorphology and flow regulation on riparian cottonwoods

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dc.contributor.authorWillms, Chad Ryan
dc.contributor.authorUniversity of Lethbridge. Faculty of Arts and Science
dc.contributor.supervisorRood, Stewart B.
dc.date.accessioned2007-05-23T20:45:31Z
dc.date.available2007-05-23T20:45:31Z
dc.date.issued2005
dc.degree.levelMasters
dc.descriptionxvi, 141 leaves : ill. ; 29 cm.en
dc.description.abstractThis study investigated the influence of geomorphic context and flow regulation on cottonwood (Populus) age structure, stand size, recruitment rates, and annual radial growth patterns along the Oldman River in southern Alberta. Dendrochronological techniques were used to age trees, establish population structures, and measure annual radial growth on three reaches in differing geomorphic contexts. Cottonwoods within a narrow, 'constrained' reach were more negatively impacted by partial dewatering of the river, but responded more favorably to increased late-summer flows combined with suitable recruitment conditions than the trees within a wide, 'alluvial' reach. A positive linear relationship between early-summer peak discharge and annual radial growth was found only on the alluvial reach. However, these trees also had the slowest growth rates, likely due to competition between trees because alluvial reaches often support large, dense stands of cottonwoods. This study demonstrates the need to consider the geomorphic context when studying cottonwood responses to river regulation.en
dc.identifier.urihttps://hdl.handle.net/10133/285
dc.language.isoen_USen
dc.publisherLethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2005en
dc.publisher.departmentDepartment of Biological Sciences
dc.publisher.facultyArts and Science
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en
dc.subjectDissertations, Academicen
dc.subjectCottonwood -- Alberta -- Oldman River Basinen
dc.subjectOldman River, Alta. -- Regulationen
dc.titleThe influence of geomorphology and flow regulation on riparian cottonwoodsen
dc.typeThesisen
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