Analysis reveals correlations between site index, soil characteristics, and climatic factors for shortleaf pine.
In the Boston Mountains, site index of shortleaf pine at age 50 was correlated with elevation, slope type, aspect, subsoil stone content, and loss-on-ignition of the A1 and Ap1 horizons. These factors are interpreted as reflections of soil moisture, stand composition, and climatic properties of the sites. Regression equations developed for all soils, residual soils, and colluvial soils predicted site indexes within an average of 2 ft on confirmatory plots. Forest Sci. 17:16-22.
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Graney et al. (1971) studied this question.
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