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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

Arizona 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	3,789	3,931	4,073	28	28	28
Other forest land	13,529	13,806	14,082	55	55	55
Reserved timberland	2,066	1,918	1,771	-30	-30	-30
TOTAL	19,384	19,655	19,926	54	54	54

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
Douglas-fir	263	325	387	12	12	12
Ponderosa pine	3,786	3,737	3,687	-10	-10	-10
Western white pine	0	0	0	0	0	0
Fir-spruce	417	320	224	-19	-19	-19
Hemlock-Sitka spruce	0	0	0	0	0	0
Larch	0	0	0	0	0	0
Lodgepole pine	0	0	0	0	0	0
Redwood	0	0	0	0	0	0
Other Hardwoods	1,050	2,198	3,346	230	230	230
Other forest types	840	435	30	-81	-81	-81
Pinyon-juniper	12,918	12,398	11,879	-104	-104	-104
Chaparral	0	63	126	13	13	13
Non-stocked	111	179	247	14	14	14
Unused	0	0	0	0	0	0
TOTAL	19,384	19,655	19,926	54	54	54

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
Douglas-fir	39.2	39.4	35.5	0.05	-0.79	-0.37
Ponderosa pine	262.9	262.3	262.5	-0.11	0.04	-0.04
Western white pine	0.0	4.1	10.1	0.82	1.19	1.01
Fir-spruce	41.8	29.3	14.9	-2.49	-2.89	-2.69
Hemlock-Sitka spruce	0.0	0.0	0.0	0.00	0.00	0.00
Larch	0.0	0.0	0.0	0.00	0.00	0.00
Lodgepole pine	0.0	0.0	0.0	0.00	0.00	0.00
Redwood	0.0	1.7	3.9	0.34	0.44	0.39
Other Hardwoods	69.5	142.4	215.8	14.58	14.69	14.63
Other forest types	54.9	28.9	2.3	-5.19	-5.32	-5.25
Pinyon-juniper	776.4	747.7	717.8	-5.76	-5.97	-5.86
Chaparral	0.0	3.8	7.6	0.76	0.76	0.76
Non-stocked	5.6	9.2	12.8	0.72	0.72	0.72
Unused	0.0	0.0	0.0	0.00	0.00	0.00
TOTAL	1,250.3	1,268.8	1,283.2	3.71	2.87	3.29

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	341.9	343.5	344.5	0.31	0.20	0.26
Forest floor and coarse woody debris	270.2	271.9	272.9	0.35	0.20	0.27
Soils	598.6	610.9	623.3	2.46	2.48	2.47
Wood products and landfills	39.6	42.5	42.5	0.58	-0.01	0.29
TOTAL	1,250.3	1,268.8	1,283.2	3.71	2.87	3.29

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	578.9	582.2	580.0	0.64	-0.44	0.10
Other Public	564.3	385.7	208.0	-35.71	-35.55	-35.63
Forest Industry	0.7	0.8	0.8	0.00	0.00	0.00
Other Private	106.3	300.2	494.5	38.77	38.86	38.82
TOTAL	1,250.3	1,268.8	1,283.2	3.71	2.87	3.29

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	0.0	0.6	0.00	0.11	0.06
Forest floor and coarse woody debris	0.0	-0.2	-0.4	-0.03	-0.04	-0.04
Soils	0.0	-0.2	-0.4	-0.04	-0.04	-0.04
Wood products and landfills	0.0	0.3	0.3	0.05	0.01	0.03
TOTAL	0.0	-0.1	0.1	-0.01	0.03	0.01

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