Alternative methods for determining edge effect on small sample plots

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Abstract
The effect of plot edge on tree growth on four uniformly spaced plots was assessed prior to using the data for development of growth simulation models. The plots were established with hybrid poplar (PopulusbalsamiferaL. × P. tristisFrisch.) cuttings at square spacings of 1, 2, 4, and 8 ft (0.30, 0.61, 1.22, and 2.44 m) with a larger open space to separate the plots. The survival, diameter, and height of individual trees were determined annually for 5 years. Data from the narrowest spacing (1 × 1 ft) (1 ft = 0.3048 m) and at the oldest age (5 years old) were used to describe attempts to determine the extent of any edge effect. The methodology involved the examination of diameter and survival trends across the plots. Regression analysis was also used to determine a uniform interior region with diameter at breast height as the dependent variable and location, number of live neighbors, and a measure of competition as possible independent variables. Each of the methods has limitations, but all of them provide some evidence as to the number of trees affected by the border.

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