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Geologic variables associated with height of yellow-poplar stands in the Bald Mountains of North Carolina.

Quartz grain size and mylonitization, geologic variables determined from rocks on sites, were associated with total height of yellow-poplar (Liriodendron tulipifera L.) stands and may be of value as independent variables in modeling tree growth from site characteristics. A predictive model containing quartz grain size and stand age accounted for about 54% of the variation in total height of yellow-poplar stands in the Bald Mountains of western North Carolina. These and other geologic variables may also be of value in classifying forest sites for species composition and productivity.