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Notes: Effect of Cone Production on Branch, Needle, and Xylem Ring Growth of Sierra Nevada Douglas-Fir

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Shoot and needle length in the upper crown of 30- to 50-year-old cone-bearing Douglas-fir were reduced in years of cone production, whereas on nonbearing trees they were unchanged. Xylem ring width at breast height in cone-bearers was reduced in years of heavy cone crops but was apparently unchanged in years of light crops. Growth was reduced only during the year that cones were produced. Peduncles remained on the tree and could be dated and used to determine the year and size of past cone crops.

Keywords: Abies concolor; Pseudotsuga menziesii; fruiting; growth reduction

Document Type: News

Affiliations: Assistant Professor of Forestry, Univ. of Minnesota, Cloquet Forest Res. Center, Cloquet

Publication date: June 1, 1969

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