Search Constraints

Start Over
Filtering by: Subject Endemic plants -- Soils -- Oregon -- Willamette River Valley Remove constraint Subject: Endemic plants -- Soils -- Oregon -- Willamette River Valley

Search Results

  • Comparing vegetation and soils of remnant and restored prairie wetlands in the northern Willamette Valley

    Creator:
    Taylor, Sara M.
    Abstract:
    Native prairies of the Willamette Valley are considered among the rarest of Oregon's ecosystems (Clark and Wilson, 2001). As a result of agriculture conversion, urban development and cessation of native burning, Willamette Valley prairies have become highly fragmented and invaded by non-native species, leaving little room for native plant diversity....
    Resource Type:
    Masters Thesis
    Full Text:
    . The climate and soil of Willamette Valley wetland prairies can support forests (Clark and Wilson

  • Germination and establishment in Willamette Valley native prairie plants

    Creator:
    Russell, Michael C.
    Abstract:
    Native plants provide many ecosystem services while also having great beauty and are a valuable component of the landscape. As use of these plants in habitat restoration, agricultural insectary plantings, and home landscapes increases so does demand for information on the basic biology of a group of species that have...
    Resource Type:
    Masters Thesis
    Full Text:
    rest of western Oregon the 6 Willamette valley has extensive grasslands with remnant patches

  • The effects of site preparation on native forb establishment in a wet prairie, Willamette Valley, Oregon

    Creator:
    Norman, Katherine N.
    Abstract:
    Wetlands and wet prairies are economically and environmentally valuable ecosystems, but many have been degraded or converted to other uses. As human understanding of wetlands' value has increased, restoration efforts have grown correspondingly. Restoration attempts use a diversity of methods, which often include seeding with native plant species. This thesis...
    Resource Type:
    Masters Thesis
    Full Text:
    Establishment in a Wet Prairie, Willamette Valley, Oregon Abstract approved: Patricia S. Muir

  • Performance of Willamette Valley native plants following herbicide exposure

    Creator:
    Blakeley-Smith, Matthew R.
    Abstract:
    Prairies were once the dominant vegetation type in Oregon's Willamette Valley. Land use conversion, fire suppression, succession, and invasive species have reduced Willamette Valley prairies to less than 1% of their historical area. The remnant prairies that persist today are small in size and are highly fragmented. Marginal strips of...
    Resource Type:
    Masters Thesis
    Full Text:
    herbicides, our understanding of how Willamette Valley plant communities respond to these treatments often

  • Response of Roughstalk Bluegrass (Poa trivialis L.) to Waterlogging Stress

    Creator:
    Liu, Mingyang
    Abstract:
    Roughstalk bluegrass (Poa trivialis L.) (RB) is a weed species that increased very quickly in grass seed production fields of the Willamette Valley. The invasion of RB in grass seed crops often occurs in waterlogged soils. In waterlogged areas, RB exhibited better competitiveness and had greater population densities than other...
    Resource Type:
    Dissertation
    Full Text:
    ..................................................................................1 Grass seed production in Oregon and Willamette Valley ..................................1 Poa