Role of species composition in relative density measurement in Allegheny hardwoods

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Abstract
Two frequently used measures of relative stand density, the tree area ratio and the stand density index, were fitted to data from Allegheny hardwood stands. Both were modified to reflect the influence of species composition, since the proportion of the basal area in different species groups had an important effect on the measurement of relative stand density in this mixed species forest type. The tree area ratio model provided a better fit to the data than the stand density index model, particularly when adapted to include three species groups: one based on Prunusserotina Ehrh. and Liriodendrontulipifera L., one based on Acerrubrum L., and one based on Acersaccharum Marsh, and Fagusgrandifolia Ehrh.

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