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Filtering by: Committee Member Jolliff, Gary Remove constraint Committee Member: Jolliff, Gary Degree Field Rangeland Resources Remove constraint Degree Field: Rangeland Resources

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  • Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation

    Creator:
    Osman, Khalid Amir
    Abstract:
    The effect of defoliation intensity and season on Douglas-fir growth were studied in three replications in the Siuslaw National Forest during 1988-1990. Four intensities of defoliation were applied once in either spring or summer 1988. Stem diameter and canopy area were linearly inversely proportional to the level of defoliation. Defoliation...
    Resource Type:
    Dissertation
    Full Text:
    Doescher for his suggestions and support, Dr. Kermit Cromack for his advice and assistance, Dr. Gary Jo

  • Identification of restoration potential on southwestern Oregon rangelands

    Creator:
    Barrington, Mack R.
    Abstract:
    The objectives of this research were to 1) evaluate the establishment and peak standing crop of Berber Orchardgrass (Dactylis glomerata var. "Berber"), Palestine Orchardgrass (Dactylis glomerata var. "Palestine"), and Sheep Fescue (Festuca ovina var. "Covar") ; 2) to assess establishment and production changes resulting from environmental gradients (elevation, slope, aspect,...
    Resource Type:
    Dissertation
    Full Text:
    included Mr. Ronald Mob ly, Dr. William Krueger, Dr. David Thomas, and Dr. Gary Jo lliff. Thanks Mr