. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. Figure 10.—Volume of live trees on forest land for the 10 most abundant species in Pennsylvania, 1989, and 2001. Error bars reflect 67-percent confidence intervals. 16000 14000 - 12000 - o i£ 10000 - ?D o 8000 - m M 6000 - is 4000 2000 ? 1989 Si 2001 mm Figure 12.—Volume of samimber on forest land for the 10 most abundant species in Pennsylvania, 1989, and 2001. Error bars reflect 67-percent confiden
. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. Figure 10.—Volume of live trees on forest land for the 10 most abundant species in Pennsylvania, 1989, and 2001. Error bars reflect 67-percent confidence intervals. 16000 14000 - 12000 - o i£ 10000 - ?D o 8000 - m M 6000 - is 4000 2000 ? 1989 Si 2001 mm Figure 12.—Volume of samimber on forest land for the 10 most abundant species in Pennsylvania, 1989, and 2001. Error bars reflect 67-percent confidence intervals. 6000 J i 5000 -. 1955 1965 1978 1989 2001 Figure 11.—Volume of sawtimber per acre of timberland in Pennsylvania by inventory date, 1955, 1965, 1978, 1989, and 2001. All differences between bars are statistically significant at 67-percent level. cherry, northern red oak, sugar maple, chestnut oak, white oak, white ash, other oaks, yellow-poplar, and eastern hemlock. Currently, red maple makes up 20 percent of the total volume of live trees in the State and accounts for 60 percent of the increase in volume statewide. It is interesting that the top 5 tree species account for more than half of the inventory volume and the top 10 account for 75 percent of the total volume. Increases were significant for 8 of the top 10 species (exceptions were sugar maple and eastern hemlock). The results for sawtimber volume also are positive. The total volume of sawtimber increased from billion board feet (International V4-inch rule) in 1989 to billion board feet in 2001, an increase of 18 percent. Increases were noted for both softwoods and hardwoods. The buildup in sawtimber volume over time is shown in Figure 11. Increases are clearly evident, but at a slower rate than in the two previous inventory periods. Again, except for sugar maple and hemlock, Pennsylvania's top 10 tree species increased in sawtimber volume (Fig. 12). Yellow- poplar had the largest increase
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