. An analysis of Pennsylvania's forest resources. Forests and forestry Pennsylvania; Forest management Pennsylvania. Yield per acre of even aged, fully Woodland Site index stocked, natural stands 3 Suitability (heightat Class age 50) Age 60 Age 90 Cubic Board Cubic Board Feet feetb feet0 feetb feet0 Excellent 85 + 3,700 + 18,600 + 5,200 + 30,950 + Very good 75 to 84 3,700 18,600 5,200 30,950 Good 65 to 74 3,100 13,900 4,400 24,500 Fair 55 to 64 2,600 9,700 3,650 18,300 a Adapted from Schnur 1937. b Entire stem inside bark. c International 1/8-inch rule to a 5-inch top; includes all trees with
. An analysis of Pennsylvania's forest resources. Forests and forestry Pennsylvania; Forest management Pennsylvania. Yield per acre of even aged, fully Woodland Site index stocked, natural stands 3 Suitability (heightat Class age 50) Age 60 Age 90 Cubic Board Cubic Board Feet feetb feet0 feetb feet0 Excellent 85 + 3,700 + 18,600 + 5,200 + 30,950 + Very good 75 to 84 3,700 18,600 5,200 30,950 Good 65 to 74 3,100 13,900 4,400 24,500 Fair 55 to 64 2,600 9,700 3,650 18,300 a Adapted from Schnur 1937. b Entire stem inside bark. c International 1/8-inch rule to a 5-inch top; includes all trees with 16-foot log. International 1/4-inch rule is approximately 10 percent less. of the soil to produce timber crops. Highly productive land can produce more timber, and is taxed at a higher rate because of its greater potential. Where are the productive soils of Pennsylvania? To answer this question, we went to a general soil map of the state developed by the USDA Soil Conservation Service and The Pennsylvania State University. Although the state has 340 different soil series, the map was developed from 91 soils that account for 63 per- cent of the state's area. Each soil was rated for its potential to produce for- est crops. By assigning a numerical score to each rating we were able to calculate a woodland suitability class for each of the 58 major groupings of soils (associations) in Pennsylvania, based on the proportion of each soil i n each association: Forest soils with excellent po- tential cover million acres (10 per- cent of the state); very good soils cover million acres (34 percent), good soils million acres (48 per- cent), and fair soils million acres (8 percent) (Fig. 24). The best soils occur in the glaciated northwest, in the valleys of the Ridge and Valley Province and the broad Cumberland- Lebanon-Lehigh Valley, and Lancas- ter County. The very good soils are. Figure 24. —Distribution of soils in Pennsylvania based on their potential for growing ti
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