Black Oak Site Quality in Relation to Soil and Topography in Southeastern Ohio
1965
Carmean, Willard H.
Site quality for black oak (Quercus velutina Lam.) was studied in 135 well-stocked, even-aged, undisturbed stands located in the unglaciated hill country of southeastern Ohio. Multiple regression analysis showed the following, for medium-textured, well-drained soils: (i) site index increases with increased depth of surface soil (A1 + A2 horizons); (ii) site index decreases with increased amounts of stone in the subsoil (B1 horizon); (iii) better site index occurs on lower slopes and in coves while poorer sites are generally found on upper slopes and ridges; and (iv) better sites occur on north- and east-facing slopes while poorer sites occur on south- and west-facing slopes. For fine-textured soils with restricted internal drainage: (i) site index increases with increased depth of surface soil (A1 + A2 horizons); (ii) poorest sites occur in areas having the finest textured subsoils; and (iii) site index increases with increased steepness of slope. Multiple-regression equations accounting for about 80% of the variance in tree height are presented for each of these soil groups. Site-prediction tables based on these equations are given for estimating the site index of black oak on the forested uplands of southeastern Ohio.
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