Recarbonization of the Biosphere pp 1-15 | Cite as
Terrestrial Biosphere as a Source and Sink of Atmospheric Carbon Dioxide
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Abstract
The terrestrial biosphere has lost a considerable amount of its antecedent carbon (C) pool because of anthropogenic activities since the dawn of settled agriculture about 12–14 millennia ago. Deforestation and land use conversion has presumably caused cumulative emission of 476 Pg C (1 Pg = 1015 g). Of this, 78 ± 12 Pg C may have been depleted from world’s soils. Globally, about 2,300 Pg C are stored to 3-m depth in the soil organic carbon (SOC) pool, 1,700 Pg C in permafrost, 600 Pg C in peatlands, and up to 1,700 Pg C in the soil inorganic carbon (SIC) pool. While a large fraction of C emissions may have been absorbed by the ocean and land-based sinks, the knowledge about the historic loss provides a reference point about the technical C sink capacity of the terrestrial biosphere. The later may be as much as a draw-down of 50 ppm of atmospheric carbon dioxide (CO2) over century or more, which in view of the already accumulated levels of atmospheric CO2 of 390 ppm is significant. Priority soils and ecosystems for recarbonization of the biosphere include degraded soils (eroded, salinized, depleted, polluted and drained peatland soils), and desertified ecosystems. Whereas the generic technologies for sustainable intensification exist for croplands, grazing lands, forest lands and restoration of degraded soils, these technologies must be validated and fine-tuned for soil-and-site specific conditions. The adverse externalities of land use change for both, climate and soils requires policy actions for corrective incentives. However, there is no panacea, and a wide range of technological options need to be carefully and prudently evaluated under site-specific situations. Policy interventions must incentivize land managers for implementing sustainable land use-, soil- and crop management practices that are avoiding the adverse effects for climate and soils. Incentives that foster the natural process of recarbonization of the biosphere can be a cost-effective strategy, and would have numerous co-benefits.
Keywords
Abrupt climate change Terrestrial biosphere Land use Land cover change Urbanization Fossil fuel combustion Ecosystem C pool Anthromes Afforestation Deforestation Soil restoration Soil erosion Carbon transported by erosion Mineral-associated carbon Rubisco C4 plants C3 plants Policy implications Ecosystem services Payments for ecosystem services Zero emission technology Aerosols Co-benefits Payments for ecosystem servicesAbbreviations
- ACC
Abrupt climate change
- C
Carbon
- CCS
Carbon capture and storage
- CDM
Clean Development Mechanism
- Gha
Gigahectare
- GCC
Global carbon cycle
- GHGs
Greenhouse gases
- LULCC
Land use land cover change
- Mha
Million hectare
- NPP
Net primary productivity
- ppm
Parts per million
- Pg
Petagram
- SIC
Soil inorganic carbon
- SOC
Soil organic carbon
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