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Publications & Products

Carbon in United States Forests and Wood Products, 1987-1997: State-by-State Estimates
by Richard A. Birdsey & George M. Lewis

Pennsylvania Estimate for 1987-1997

Table 1. Area by land class (1000 ac).
Land class	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
Timberland	15,918	15,885	15,853	-7	-7	-7
Other forest land	371	295	219	-15	-15	-15
Reserved timberland	708	771	833	12	12	12
TOTAL	16,997	16,951	16,905	-9	-9	-9

Table 2. Area of forest land by forest type (1000 ac).
Forest type	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
White-red-jack pine	887	851	814	-7	-7	-7
Spruce-fir	56	66	75	2	2	2
Longleaf-slash pine (planted)	0	0	0	0	0	0
Longleaf-slash pine (natural)	0	0	0	0	0	0
Loblolly-shortleaf pine (planted)	0	0	0	0	0	0
Loblolly-shortleaf pine (natural)	147	145	143	0	0	0
Oak-pine	288	324	359	7	7	7
Oak-hickory	8,457	8,237	8,016	-44	-44	-44
Oak-gum-cypress	0	12	24	2	2	2
Elm-ash-cottonwood	569	485	400	-17	-17	-17
Maple-beech-birch	5,995	6,319	6,644	65	65	65
Aspen-birch	441	414	387	-5	-5	-5
Other forest types	0	0	0	0	0	0
Non-stocked	155	99	43	-11	-11	-11
TOTAL	16,997	16,951	16,905	-9	-9	-9

Table 3. Total carbon stock on forest land and annual change by forest type (MMTC).
Forest type	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
White-red-jack pine	89.0	88.0	86.9	-0.19	-0.22	-0.21
Spruce-fir	5.3	5.9	6.3	0.11	0.10	0.10
Longleaf-slash pine (planted)	0.0	0.0	0.0	0.00	0.00	0.00
Longleaf-slash pine (natural)	0.0	0.0	0.0	0.00	0.00	0.00
Loblolly-shortleaf pine (planted)	0.0	0.0	0.0	0.00	0.00	0.00
Loblolly-shortleaf pine (natural)	7.6	8.1	8.4	0.09	0.08	0.08
Oak-pine	19.9	21.4	22.9	0.29	0.30	0.29
Oak-hickory	726.3	705.8	684.6	-4.09	-4.25	-4.17
Oak-gum-cypress	0.0	0.6	1.1	0.11	0.11	0.11
Elm-ash-cottonwood	31.5	26.7	21.9	-0.97	-0.95	-0.96
Maple-beech-birch	642.7	682.3	720.9	7.91	7.73	7.82
Aspen-birch	32.4	31.3	30.2	-0.21	-0.21	-0.21
Other forest types	7.3	8.0	8.6	0.14	0.12	0.13
Non-stocked	10.4	6.4	2.5	-0.80	-0.78	-0.79
TOTAL	1,572.4	1,584.4	1,594.4	2.40	2.01	2.20

Table 4. Total carbon stock on forest land and annual change by accounting component (MMTC).
Accounting component	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
Biomass	468.4	470.3	472.3	0.37	0.40	0.39
Forest floor and coarse woody debris	147.9	146.6	145.2	-0.27	-0.29	-0.28
Soils	914.3	920.1	926.0	1.17	1.17	1.17
Wood products and landfills	41.7	47.3	50.9	1.12	0.72	0.92
TOTAL	1,572.4	1,584.4	1,594.4	2.40	2.01	2.20

Table 5. Total carbon stock on forest land and annual change by owner (MMTC).
Owner group	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
National Forest	58.1	55.9	53.7	-0.44	-0.45	-0.44
Other Public	359.0	359.6	359.7	0.12	0.02	0.07
Forest Industry	82.5	77.2	71.7	-1.06	-1.10	-1.08
Other Private	1,072.7	1,091.6	1,109.3	3.77	3.54	3.66
TOTAL	1,572.4	1,584.4	1,594.4	2.40	2.01	2.20

Table 6. Change in total carbon stock on forest land attributed to land use change (MMTC).
Accounting component	1987	1992	1997	Average Annual Change
				1987-1992	1992-1997	1987-1997
Biomass	0.0	-2.7	-5.1	-0.55	-0.47	-0.51
Forest floor and coarse woody debris	0.0	-1.0	-1.9	-0.19	-0.19	-0.19
Soils	0.0	-3.0	-5.5	-0.59	-0.50	-0.55
Wood products and landfills	0.0	0.3	0.7	0.07	0.08	0.07
TOTAL	0.0	-6.3	-11.7	-1.26	-1.08	-1.17

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