Response of Three Conifer Species to Site Preparation and Shrub Control

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A 5-year field study was conducted to determine the effect of three methods of site preparation in combination with three levels of shrub suppression on subsequent microenvironmental, shrub and tree responses. Shrub canopy volume and survival, growth, and water potential of planted ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Lawson.), sugar pine [Pinus lambertiana Dougl. (Strobus L. Mold.)], and white fir [Abies concolor (Gord. & Glend.) Lindl.] were measured. Ponderosa pine survived better than sugar pine or white fir regardless of shrub presence or absence. Shrub canopy volume did not influence tree survival; however, the presence of shrub debris from some treatments increased planting difficulty and resulted in increased tree mortality. Predawn and midday water potential, height, stem diameter, and canopy volume of conifers were highest when shrub canopy volumes were low. Forest Sci. 32:61-77.

Keywords: Abies concolor; Pinus lambertiana; Pinus ponderosa

Document Type: Journal Article

Affiliations: Associate Professor of Botany, Department of Forest Science, Oregon State University, Corvallis, OR 97331

Publication date: March 1, 1986

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