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Strobilus production and growth of Pacific yew under a range of overstory conditions in western Oregon

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  • Strobilus production, growth, and morphology of Pacific yew (Taxus brevifolia Nutt.) were examined at three sites in the Cascade Mountains and one site in the Willamette Valley of western Oregon. Strobilus production on branch segments was positively associated with overstory openness for male and female trees at all four sites over 2 years. Strobilus production was also associated with branch vigor, but not as consistently as with overstory. Other variables, including tree size and age, mass of branches, branch bifurcations, and potential radiation, failed to explain significant variation in strobilus production. Overstory openness was also correlated with 5-year growth increment for all trees and with mass of 1994 branch growth for female trees, suggesting that tree vigor increased with overstory openness. In addition, branch mass and the number of branch bifurcations were positively associated with overstory openness.
  • Keywords: strobilus production, Pacific yew (Taxus brevifolia)
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  • DiFazio, S.P., N.C. Vance, and M.V. Wilson. 1997. Strobilus production and growth of Pacific yew under a range of overstory conditions in western Oregon. Canadian Journal of Forest Research 27(7): 986-993.
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  • 27
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  • 7
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