Geometrical considerations affecting the determination of basal area growth by increment boring methods Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/k0698b55g

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  • The purpose of this study was to examine the geometry of enclosed circles in order to predict the probable effects of increment boring methods used in determining basal area growth. Of specific concern was the comparison of areas derived from sets of borings taken from opposite sides of the tree contrasted with sets taken at right angles to each other. A simple function for bias using opposite borings is given. Four borings in each of 107 sample trees were combined in several ways, and the differences between areas produced by these combinations were statistically tested. The differences between areas computed using opposite sets of borings were significantly smaller than those using sets at right angles at the .01 level, and the variance of those differences was also significantly smaller at the .01 level.
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