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Site Index Comparisons for Several Forest Species in the Southern Appalachians¹

ABSTRACT

This paper gives methods and results of a study of relationships of site indices of 10 tree species common in the Southern Appalachians. These species are: scarlet oak, black oak, northern red oak, chestnut oak, white oak, white pine, shortleaf pine, pitch pine, Virginia pine, and yellow-poplar. Site indices of the 10 species were correlated by regression methods so that when the site index of 1 species is known for a given piece of land, it is possible to determine, by use of equations or a chart, the site index for 1 or all of the other 9 species. Results of a special field test showed that the standard error of estimate for predicting site index of scarlet oak from other species was ±5.36 feet by using equations and ±5.28 feet by using the chart. White pine had the highest site index on all lands or sites except on the best, where yellow-poplar was superior. Of all species, the chart shows that yellow-poplar is the most responsive to site change; it has the highest site index on the best sites and the lowest site index on the poorest sites.

¹ Contribution from the Forest Service, USDA. Presented before Div. V-A, Soil Science Society of America, Atlanta, Ga. Nov. 19, 1957.

² Forest Service, USDA, Washington, D. C.

Received for publication November 29, 1957. Accepted for publication June 19, 1958.