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Filtering by: Creator Cuéllar, Dawn M. Christiansen Advisor Doescher, Paul S.

Response of Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) to defoliation of understory grasses and drought

Creator:

Purrington, Teal Mackenzie

Abstract:

Water potential, leaf conductance, growth, nitrogen content, and seedling survival of Wyoming Big Sagebrush (Artemisia tridentata ssp. wyomingensis) following defoliation of the herbaceous understory were assessed during two growing seasons. Precipitation was 107% and 63% of the long-term mean (283 mm) in 1989 and 1990, respectively, which presented an opportunity...

Resource Type:

Masters Thesis

Full Text:

Teal M. Purrington for the degree of Master of Science in Rangeland Resources presented on January 292
Effects of prescribed cattle grazing on reforestation in Oregon's southern Cascades

Creator:

Karl, Michael G.

Abstract:

Reforesting harvested lands in southwestern Oregon has been difficult because of low rainfall, high evaporative demand, and competitive understory vegetation. Herbicides have been a preferred method to control competing vegetation but herbicide use on federal lands was curtailed in 1984. As a result, interest in livestock grazing as a vegetation...

Resource Type:

Dissertation

Full Text:

- elevation (670 m) site to evaluate seedling survival and growth of Douglas-fir (Pseudotsuga menziesii