Table 4: Relative potential in 2010 for net change in carbon stocks through some improved management and changed land-use activities.a | ||||
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(1) Activity |
(2) Total
Areab (Mha) |
(3) Assumed
Percentage of Total Area of Column 2 under Activity in 2010 (%) |
(4) Net Annual
Rate of Change in Carbon Stocks per Hectareb (t C ha-1 yr-1) |
(5) Estimated
Net Change in Carbon in 2010 (Mt C yr-1) |
|
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A. Annex I Countries |
|
|
|
|
a) Improved Management within a Land Usec | ||||
Forest Management |
1900
|
10
|
0.5
|
100
|
Cropland Management |
600
|
40
|
0.3
|
75
|
Grazing Land Management |
1300
|
10
|
0.5
|
70
|
Agroforestry |
83
|
30
|
0.5
|
12
|
Rice Paddies |
4
|
80
|
0.1
|
<1
|
Urban Land Management |
50
|
5
|
0.3
|
1
|
b) Land-Use Change | ||||
Conversion of Cropland to Grassland |
600
|
5
|
0.8
|
24
|
Agroforestry |
<1
|
0
|
0
|
0
|
Wetland Restoration |
230
|
5
|
0.4
|
4
|
Restoring Severely Degraded Land |
12
|
5
|
0.25
|
1
|
|
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B. Global Estimates | ||||
a) Improved Management within a Land Use | ||||
Forest Management |
4050
|
10
|
0.4
|
0.4
|
Cropland Management |
1300
|
30
|
0.3
|
125
|
Grazing Land Management |
3400
|
10
|
0.7
|
240
|
Agroforestry |
400
|
20
|
0.3
|
26
|
Rice Paddies |
150
|
50
|
0.1
|
7
|
Urban Land Management |
100
|
5
|
0.3
|
2
|
b) Land-Use Change | ||||
Agroforestry |
630
|
20
|
3.1
|
390
|
Conversion of Cropland to Grassland |
1500
|
3
|
0.8
|
38
|
Wetland Restoration |
230
|
5
|
0.4
|
4
|
Restoring Severely Degraded Land |
280
|
5
|
0.3
|
3
|
|
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a Totals were not included in the table for several reasons: i) The list
of candidate activities is not exclusive or complete; ii) it is unlikely that
all countries would apply all candidate activities; and iii) the analysis does
not presume to reflect the final interpretations of Article 3.4. Some of these
estimates reflect considerable uncertainty. b A summary of reference sources is contained in Tables 4-1 and 4-4 of this Special Report. Calculated values were rounded to avoid the appearance of precision beyond the intent of the authors. The rates given are average rates that are assumed to remain constant to 2010. c Assumed to be the best available suite of management practices for each land use and climatic zone. |
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