Graduate Thesis Or Dissertation
 

Genetic variation in growth potential of black cottonwood in the Willamette Valley

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  • Black cottonwood (Populus trichocarpa Torr. and Gray) cuttings were collected from five Oregon provenances along a partial north-south distribution of the species. Cuttings from each provenance were grown at two locations, one on the Willamette Valley floor, and the other on the Valley margin, for one year. Survival at both locations was very poor. Stem production was greater on the floor site than the margin site because of differences in edaphic conditions and deer browsing at the margin site. Variation in stem production was greater within provenances than among provenances, suggesting that single-tree-selection would be more profitable than provenance-selection. Leaf length and width measurements were found to be highly correlated with stem weight, and chosen as the best method for selecting superior individuals. Practical applications for cottonwood culture based on results of this and other studies are discussed.
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  • Black cottonwood (Populus trichocarpa Torr. and Gray) cuttings were collected from five Oregon provenances along a partial north-south distribution of the species. Cuttings from each provenance were grown at two locations, one on the Willamette Valley floor, and the other on the Valley margin, for one year. Survival at both locations was very poor. Stem production was greater on the floor site than the margin site because of differences in edaphic conditions and deer browsing at the margin site. Variation in stem production was greater within provenances than among provenances, suggesting that single-tree-selection would be more profitable than provenance-selection. Leaf length and width measurements were found to be highly correlated with stem weight, and chosen as the best method for selecting superior individuals. Practical applications for cottonwood culture based on results of this and other studies are discussed.
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