Root distribution of 12-year-old forests at rocky sites in southwestern Oregon: effects of rock physical properties

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Abstract
Distribution of root length density (in terms of centimetres of fine and large roots per cubic centimetre of soil and bedrock) was analyzed at harsh forest sites supporting 12-year-old stands of pure whiteleaf manzanita (Arctostaphylosviscida Parry), pure ponderosa pine (Pinusponderosa Dougl. ex Laws.), or mixtures of Pacific madrone (Arbutusmenziesii Pursh) and Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) in southwest Oregon. On such sites, soil (usually

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