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Filtering by: Alt title Wright's Point, Harney County, Oregon : an example of inverted topography Remove constraint Alt title: Wright's Point, Harney County, Oregon : an example of inverted topography Degree Field Soil Science Remove constraint Degree Field: Soil Science

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  • Development of predictive mapping techniques for soil survey and salinity mapping

    Creator:
    Elnaggar, Abdelhamid A.
    Abstract:
    Conventional soil maps represent a valuable source of information about soil characteristics, however they are subjective, very expensive, and time-consuming to prepare. Also, they do not include explicit information about the conceptual mental model used in developing them nor information about their accuracy, in addition to the error associated with...
    Resource Type:
    Dissertation
    Full Text:
    ...................................................... 62 3.3.2. Predictive soil map of the reference area in Harney County........................ 63

  • Use of decision tree analysis for predictive soils mapping and implementation on the Malheur County, Oregon initial soil survey

    Creator:
    Hash, Sarah Jane
    Abstract:
    Soil surveys provide essential information for making land use and management decisions on publicly-owned lands in the semi-arid Great Basin. Soil maps produced with conventional mapping techniques are time-consuming, costly, and do not explicitly document the soil scientist's mental soil-landscape model. Predictive soils mapping using decision tree analysis (DTA) can...
    Resource Type:
    Masters Thesis
    Full Text:
    Soil Survey of Malheur County, Oregon............................................................ 28

  • Water and anion movement in selected soils of western Oregon

    Creator:
    Hammermeister, Dale P.
    Abstract:
    Experiments were carried out to study the movement of water and halide anions in perched water tables or saturated zones in the soil and upper rock mantle of eight different experimental sites located on low hills near the western border of the Willamette Valley. At each site the experimental procedure...
    Resource Type:
    Dissertation
    Full Text:
    Oregon AN ABSTRACT OF THE THESIS OF Dale Hammermeister for the degree of Doctor of Philosophy in Soil

  • Distribution, form, and signigicance of plant opal in Oregon soils

    Creator:
    Norgren, Joel A.
    Abstract:
    This study was undertaken to increase knowledge of opal phytoliths in plants and soils of Oregon, and thus encourage further use of phytoliths in future pedologic investigations. Content of plant opal in needles from ten common Oregon conifer species ranged from 0.2 to 7.9%. Western larch (Larix occidentalis) contained the...
    Resource Type:
    Dissertation
    Full Text:
    vegetation across a ponderosa pine -grassland boundary in Wasco County, Oregon. Using grain counts of the

  • Towards a national map of soil liquefaction susceptibility : modeling with heuristic and geotechnical methods

    Creator:
    Lindsley, Adam E.
    Abstract:
    This study investigates the use of predictive mapping techniques as well as geotechnical criteria in developing a multiregional soil liquefaction model and subsequent maps. The maps were produced using National Cooperative Soil Survey data, in the gSSURGO format, combined with soil liquefaction data gathered from studies, articles, and traditional seismic...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Adam E. Lindsley

  • Correspondence of soil properties and classification units with sagebrush communities in southeastern Oregon

    Creator:
    Lentz, Rodrick David
    Abstract:
    This research employed multivariate analytical techniques to statistically examine the relationship between individual soillandscape units (SLUs) in Southeastern Oregon and their associated sagebrush communities. The objective was to determine if soil properties between SLUs differed, describe the variation, and verify that these differences were reflected in the taxonomic class of...
    Resource Type:
    Masters Thesis
    Full Text:
    in the northwestern corner of Harney County, Oregon approximately 72 km (45 mi) west-southwest of

  • The effects of the Mazama tephra-falls : a geoarchaeological approach

    Creator:
    Matz, Stephan E.
    Abstract:
    About 7,000 years ago two major tephra-falls blanketed the Pacific Northwest in volcanic ash. These two tephra-falls, identified as the Llao and climatic tephra-falls, were a part of the eruptive events that led up to the collapse of Mount Mazama to form Crater Lake in the southern Oregon Cascades. The...
    Resource Type:
    Masters Thesis
    Full Text:
    approach AN ABSTRACT OF THE THESIS OF Stephan Edward Matz for the degree of Master of Arts in

  • Plot-Scale Field Investigation : Characterizing Water Motion in Sandy Agricultural Soils

    Creator:
    Nolasco, Stephanie M.
    Abstract:
    Irrigated agricultural production in sandy soils presents several unique challenges to growers, including naturally high permeability, low native water retention, as well as high rates of water drainage losses and leaching of chemicals to the shallow aquifers. This study is an initial investigation into water motion in the sandy agricultural...
    Resource Type:
    Masters Thesis
    Full Text:
    .......................................................... 38 Figure 13: Example of water motion after mowing with situ field data for Site 3 ........... 39