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  • Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley

    Creator:
    Johnson, Christopher
    Abstract:
    A thermal infrared (TIR) camera is used to remotely sense the foliage temperature in a mountain valley. The foliage temperature is used as a proxy for air temperature and can be used to study and map the dynamics of the nocturnal, weak-wind boundary layer in this valley. All radiative flux...
    Resource Type:
    Masters Thesis
    Full Text:
    Canopy Flow Observation (ARCFLO) project. ARCFLO studies how air moves in plant canopies such as

  • Characterizing grapevine canopy architecture

    Creator:
    Navarrete, Alejandra
    Abstract:
    Vertically shoot positioned (VSP) training systems are common in Oregon's Willamette Valley, where deep fertile soils and high regional precipitation task growers with curbing vegetative vigor within this system. Management strategies, such as canopy hedging and cluster-zone leaf removal, are used to improve microclimate within the canopy and around the...
    Resource Type:
    Masters Thesis
    Full Text:
    canopy define plant atmospheric interactions. Leaf characteristics such as size, age (Kriedemann 1968

  • 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

  • Measurement, modeling, and remote sensing of snow cover in areas of heterogeneous vegetation

    Creator:
    Selkowitz, David
    Abstract:
    Numerous studies have demonstrated that vegetation canopies affect snow accumulation and ablation processes. In addition, estimates of remotely sensed snow covered area can be biased by the presence of an overlying vegetation canopy. Consequently, any attempts to measure, model, or map the distribution of snow in a region with heterogeneous...
    Resource Type:
    Masters Thesis

  • Overstory density and disturbance impacts on the resilience of coniferous forests of western Oregon

    Creator:
    Neill, Andrew R.
    Abstract:
    A trait based approach was used to assess impacts of overstory density and thinning on understory vegetation components related to wildlife habitat. The relationship between overstory basal area and understory vegetation for species grouped by traits, such as production of flowers, fleshy-fruit and palatable leaves, was characterized in thinned and...
    Resource Type:
    Masters Thesis
    Full Text:
    effects of plants on ecosystem functioning than species diversity (Diaz and Cabido 2001). Plant traits

  • Patterns in understory vegetation communities across canopy gaps in young, Douglas-fir forests of western Oregon

    Creator:
    Fahey, Robert T.
    Abstract:
    Canopy gap formation is a major factor contributing to maintenance of overstory species diversity and stand structure in forests and may be integral to development of understory shrub and herb layers as well. Acknowledgement of gap formation as a fundamental feature of natural forests has led to consideration of gaps...
    Resource Type:
    Masters Thesis
    Full Text:
    in conifer forest canopy gaps. Ecology 78:2458-2473. Halpern, C. B., and T. A. Spies. 1995. Plant

  • Seasonal snowcover dynamics beneath boreal forest canopies

    Creator:
    Link, Timothy E.
    Abstract:
    The accurate simulation of snowpack deposition and ablation beneath forested areas is confounded by the fact that the vegetation canopy strongly affects the snow surface energy balance. The canopy alters the radiation balance of the snowcover, and reduces the wind speed at the snow surface. Data collected as part of...
    Resource Type:
    Masters Thesis
    Full Text:
    forested areas is confounded by the fact that the vegetation canopy strongly affects the snow surface

  • The influence of canopy structure and epiphytes on the hydrology of Douglas-fir forests

    Creator:
    Pypker, Thomas G.
    Abstract:
    Canopy structure has a significant impact on the canopy hydrology of Douglas-fir forests in the Pacific Northwest (PNW). Whole canopy rainfall interception was measured for young Douglas-fir forest and compared to an old-growth Douglas-fir forest. The old-growth forest had significantly greater canopy water storage capacity (5) and direct throughfall fraction...
    Resource Type:
    Dissertation
    Full Text:
    permitted the measurement of the water fluxes above a plant canopy (e.g. aerodynamic method, Bowen Ratio