. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first three years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. 60 "D C JS « 50 9> 40 30 o ?? 20 CM O u 0) .a E 3 Z 10 ? 1989 ? 2002 11 Jlfk 1 n fi rta rb Figure 9.—Number of 2-inch live trees per acre of forest land for selected species, Pennsylvania, 1989 and 2002. £ o 1_ Q. = 5 inch. i 1 liii. °4 0|?f Figure 10.—Percent of trees on forest land by broad diameter class and ranked by overstory percent, Pennsylvania, 2002. Ano
. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first three years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. 60 "D C JS « 50 9> 40 30 o ?? 20 CM O u 0) .a E 3 Z 10 ? 1989 ? 2002 11 Jlfk 1 n fi rta rb Figure 9.—Number of 2-inch live trees per acre of forest land for selected species, Pennsylvania, 1989 and 2002. £ o 1_ Q. = 5 inch. i 1 liii. °4 0|?f Figure 10.—Percent of trees on forest land by broad diameter class and ranked by overstory percent, Pennsylvania, 2002. Another way to view the structural changes is to examine the percentage of small versus large stems. Figure 10 compares the relative percentage of trees less than inches in diameter to trees more than inches, , overstory and understory trees, respectively. Species/ species groups that have higher abundance in the understory than the overstory are black cherry, Black birch, beech, and blackgum. Species/species groups that exhibit higher abundance in the overstory compared to the understory are red maple, chestnut oak, sugar maple, eastern hemlock, northern red oak, white oak, white ash, other oaks, hickory, and yellow-poplar. Inventory Volume As mentioned earlier, the depth of the analysis of change in volume will be limited during the early years of the annual inventory. Net change in inventory volume expressed in cubic and board feet for the top species will highlight the more salient trends. The sound-wood volume of live trees includes growing-stock, rough-cull, and rotten-cull trees. The total volume of live trees on forest land increased from to billion cubic feet, a 23-percent increase between 1989 and 2002. Inventory volume increased for both softwoods and hardwoods. Changes in the volume of growing-stock trees on timberland, depicted in Figure 11, illustrate changes in inventory since 1955 (only the inventory of growing- stock trees on timberlan
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