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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

Iowa 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
1,459
1,701
1,944
48
48
48
Other forest land
27
23
19
-1
-1
-1
Reserved timberland
76
82
88
1
1
1
TOTAL
1,562
1,806
2,050
49
49
49
 
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
0
3
6
1
1
1
Spruce-fir
0
0
0
0
0
0
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)
0
12
24
2
2
2
Oak-pine
35
31
26
-1
-1
-1
Oak-hickory
871
914
957
9
9
9
Oak-gum-cypress
0
0
0
0
0
0
Elm-ash-cottonwood
438
486
535
10
10
10
Maple-beech-birch
143
318
492
35
35
35
Aspen-birch
8
8
7
0
0
0
Other forest types
0
0
0
0
0
0
Non-stocked
67
35
3
-6
-6
-6
TOTAL
1,562
1,806
2,050
49
49
49
 
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
0.0
0.2
0.4
0.04
0.04
0.04
Spruce-fir
0.0
0.0
0.0
0.00
0.00
0.00
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
0.1
0.01
0.01
0.01
Loblolly-shortleaf pine (natural)
0.0
0.5
1.0
0.09
0.10
0.10
Oak-pine
2.1
1.4
0.7
-0.14
-0.14
-0.14
Oak-hickory
71.5
73.8
76.1
0.46
0.47
0.46
Oak-gum-cypress
0.0
5.3
10.5
1.05
1.05
1.05
Elm-ash-cottonwood
39.7
37.4
35.1
-0.47
-0.46
-0.46
Maple-beech-birch
16.1
20.1
24.0
0.81
0.78
0.79
Aspen-birch
0.7
0.6
0.6
-0.01
-0.01
-0.01
Other forest types
9.2
9.3
9.4
0.02
0.02
0.02
Non-stocked
4.4
2.3
0.2
-0.42
-0.42
-0.42
TOTAL
143.7
150.9
158.1
1.45
1.44
1.45
 
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
30.5
35.4
40.4
0.99
0.99
0.99
Forest floor and coarse woody debris
12.4
14.6
16.7
0.44
0.42
0.43
Soils
76.7
76.6
76.4
-0.03
-0.02
-0.03
Wood products and landfills
24.1
24.3
24.6
0.04
0.06
0.05
TOTAL
143.7
150.9
158.1
1.45
1.44
1.45
 
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
0.0
0.0
0.0
0.00
0.00
0.00
Other Public
15.4
17.8
20.2
0.47
0.48
0.48
Forest Industry
0.0
0.0
0.0
0.00
0.00
0.00
Other Private
128.2
133.1
137.9
0.98
0.96
0.97
TOTAL
143.7
150.9
158.1
1.45
1.44
1.45
 
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
0.2
1.7
0.03
0.30
0.17
Forest floor and coarse woody debris
0.0
-0.2
-0.3
-0.03
-0.03
-0.03
Soils
0.0
-0.5
-1.0
-0.10
-0.10
-0.10
Wood products and landfills
0.0
0.3
0.6
0.06
0.05
0.06
TOTAL
0.0
-0.2
0.9
-0.04
0.21
0.09

 


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