Variation in Specific Gravity of Cottonwood as Affected by Tree Sex and Stand Location
The effect of sex, sample location, and growth rate on specific gravity of cottonwood (Populus deltoides Bartr.) was studied. Four hundred cores representing the terminal one inch of radial growth were collected from four stands, half from the north sides of the trees and the remainder from the south sides. Mean specific gravity for south-side borings was slightly higher than that for north-side samples, but not enough to be statistically significant. Sex was not a significant source of variation when specific gravities for north and south samples from a tree were combined. The mean difference (N-S), however, was significantly larger for females than for males. Sex of trees within a stand contributed little to variation in specific gravity. Each stand mean was significantly different from each other stand mean. The correlation between specific gravity and growth rate, as reflected by number of annual rings in the last inch of radial growth, was not significant for (N+S) or (N-S) values.
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Document Type: Journal Article
Affiliations: Forestry Graduate from the University of Illinois now Serving with the U. S. Army
Publication date: 1965-03-01
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