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    Foliage and winter woody browse quality of an important Salix browse species: effects of presence of alder-derived nitrogen and winter browsing by Alaskan moose (Alces alces gigas)

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    Author
    Burrows, Justin
    Chair
    Kielland, Knut
    Committee
    Wagner, Diane
    Ruess, Roger
    Keyword
    willows
    browsing
    growth
    chemical ecology
    Alaska
    Tanana River Valley
    moose
    food
    soils
    nitrogen content
    alder
    ecology
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    URI
    http://hdl.handle.net/11122/10891
    Abstract
    In this study, I examined the relationship between soil nitrogen and winter browsing by moose on the physical and chemical characteristics of Salix alaxensis; specifically stem production, leaf nutritional quality, and stem nutritional quality of tissues produced the following growing season. I measured stem biomass production the 2013 growing season and offtake during the 2013-2014 winter browsing season at 16 sites on the Tanana River floodplain near Fairbanks, Alaska. I revisited the sites the following summer and autumn to assess regrowth and to collect soil, foliage, and stem samples. Browsing intensity and total soil nitrogen were similar in sites with and without alder, a nitrogen-fixing shrub. Soil nitrogen and browsing intensity were not consistently related to changes in stem or leaf quality, although there were significant relationships in some subsets. Soil nitrogen and browsing intensity also did not have consistent relationships with stem regrowth the following growing season. These results indicate that S. alaxensis growing in this system are able to recover from a naturally broad range of browsing utilization, including very high levels of offtake, and continue to produce nutritious leaves and stems.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2019
    Table of Contents
    General introduction -- Chapter 1: Foliage and winter woody browse quality of an important Salix browse species: effects of presence of alder-derived nitrogen and winter browsing by Alaskan moose (Alces alces gigas) -- General conclusion.
    Date
    2019-12
    Type
    Thesis
    Collections
    Biological Sciences

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