. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. With Red Maple Seedlings Only Seedling and Saplings ? strict ? Standard ? 52 ? 39 A17 H 60 Q. 40 A Strict « Standard ? 66 ? 48 ^51 ? 31 A 56 Without Red Maple Seedlings Only Seedlings and Seedlings A strict ? Standard ? 46 ? 30 ? 23 ? 12 Species Composition Group A Strict ? Standard ? 65 AS2 ? 45 ? 37 ? 24 Species Composition Group Figure 15.—Percentage of samples satisfying regeneration criteria by
. Annual inventory report for Pennsylvania's forests [electronic resource] : results from the first two years. Forest surveys Pennsylvania Statistics; Forests and forestry Pennsylvania Statistics. With Red Maple Seedlings Only Seedling and Saplings ? strict ? Standard ? 52 ? 39 A17 H 60 Q. 40 A Strict « Standard ? 66 ? 48 ^51 ? 31 A 56 Without Red Maple Seedlings Only Seedlings and Seedlings A strict ? Standard ? 46 ? 30 ? 23 ? 12 Species Composition Group A Strict ? Standard ? 65 AS2 ? 45 ? 37 ? 24 Species Composition Group Figure 15.—Percentage of samples satisfying regeneration criteria by species composition grouping and regeneration criteria with and without red maple, Pennsylvania, 2001. The sample data means are subject to sampling errors of percent. Plateau A strict ?Standard ? 65 ?fiS ? 45 A 46 f 47 A 24 Species Composition Group Eastern Broadleaf - West. Central Appalachian A strict ?Standard ? 72 A52 ?.44 A 30 Species Composition Group Eastern Broadleaf - East A Strict ? Standard ? 67 ? 61 ? 50 A50 A 39 A 22 Species Composition Group Species Composition Group Figure 16.—Percentage of samples satisfying regeneration criteria by species composition grouping, regeneration criteria, and ecoregion using seedlings and saplings, Pennsylvania, 2001. The sample data means are subject to sampling errors of percent. The impact of red maple is of interest for additional evaluation of the study results. If red maple regeneration is heavily influencing regeneration-stocking levels, then removing the species from the analysis should reveal its impact. Results using seedlings only, and seedlings and saplings are illustrated in Figure 15. The impact of red maple is strong for both regeneration components and might partially explain differences in the 1989 and 2001 study results had the development of this species been accelerated between studies. The results for larger ecoregions are shown in Figure 16. It would seem that the Plateau and eastern portions of t
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