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Analysis reveals that yield measures correlate with exchangeable calcium and magnesium in northern hardwoods, suggesting alternatives to traditional site index.
The Chapman-Richards function was fit to yield data from northern hardwood stands on sites of different quality. The upper asymptote and maximum growth rate of each of the fitted curves were used as measures of the quality of each site, and were found to be significantly correlated with the concentrations of exchangeable calcium and magnesium on the sites and with aspect. No significant correlation was found between site index measurements and any of the 13 soil-site factors in this study. This was attributed to the difficulty of obtaining valid site index measurements in these stands. It was concluded that measures of site quality derived from fitted yield curves are practical alternatives to site index, provided sufficient yield data are available to obtain meaningful curves. Forest Sci. 31:209-219.
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Schmoldt et al. (1985) studied this question.
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