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  • Estimating ground cover via spectral data

    Creator:
    Axness, Daniel S.
    Abstract:
    Potato ground cover and spectral data were measured in the Columbia Basin during the 1990 growing season. Three spectral were correlated with ground cover; normalized difference, near infrared-red ratio, and the first derivative of the spectral curve at 750 nm. All models were statistically significant at the 99% level. Normalized...
    Resource Type:
    Masters Thesis
    Full Text:
    Figure 2 Grid Placed over Potato Plants 24 Figure 3 Ground Cover vs. Leaf Area Index. 27 Figure 4 Plant

  • Germination and first-year survival of red alder seedlings in the central Coast Range of Oregon

    Creator:
    Haeussler, Sybille
    Abstract:
    The role of disturbance in seed germination and first-year survival of red alder (Alnus rubra) was studied over two growing seasons at four sites representing a climatic gradient within the central Coast Range of Oregon. Disturbance affected red alder seed germination and seedling establishment by altering the temperature and moisture...
    Resource Type:
    Masters Thesis

  • Influences of riparian canopy on aquatic communities in high desert streams of eastern Oregon

    Creator:
    Tait, Cynthia K.
    Abstract:
    Because riparian canopy controls most energy inputs to stream ecosystems, it directly affects the structure of aquatic food webs and the ecological processes that govern interactions among trophic levels. This study addresses the interdependence among riparian canopy, benthic community structure, and the carrying capacity of high desert streams for salmonid...
    Resource Type:
    Dissertation
    Full Text:
    ). This variation in plant productivity imposed by canopy provides the "bottom-up template" for stream