Sustainable Land Management for Mitigating Climate Change
Table 30. Potential of desertification control and land restoration to sequester C (Gt C/yr) (Recalculated from Lal, 2001)
- Bu səhifədəki naviqasiya:
- Restoration of eroded lands
- Reclamation of salt-affected soils
- Sequestration as secondary carbonates
|
Process |
Range |
Mean |
% of Total Potential |
|
Restoration of eroded lands |
0.2-0.3 |
0.25 |
21 |
|
Restoration of physically and chemically degraded soils |
<0.01 |
<0.01 |
1 |
|
Reclamation of salt-affected soils |
0.4-1.0 |
0.7 |
60 |
|
Agricultural intensification on undegraded soils |
0.01-0.02 |
0.015 |
- |
|
Sequestration as secondary carbonates |
0.01-0.4 |
0.2 |
17 |
|
Total |
0.62-1.72 |
1.17 |
100 |
|
These estimates have large uncertainties, the potentials of different strategies may not be additive, and adoption of recommended measures at global scale remains a major challenge. | |||
96. An important consideration to realization of this biophysical potential is identification and implementation of policies that facilitate adoption of SLM options, assessment of the societal value of soil C, and development of mechanisms that facilitate C trading (e.g., clean development mechanism (CDM)). An important issue is C farming and its commoditization. For some of these SLM practices to be scaled-up, farmers and other land managers would need to be compensated for adopting practices that benefit the local and global environments. Important among the societal benefits of enhancing soil and ecosystem C, for which farmers must be directly compensated, include: (i) reduction in erosion and downstream sedimentation, (ii) decrease in non-point source pollution, (iii) biodegradation of pollutants, (iv) purification of natural waters, (v) enhancement of biodiversity (soil and vegetation), and (vi) reduction in risks of accelerated greenhouse effect.
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