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Carbon sequestration in soil

Lal, Rattan, Negassa, Wakene, Lorenz, Klaus
Current opinion in environmental sustainability 2015 v.15 pp. 79-86
agroecosystems, carbon dioxide, rhizosphere, soil organic carbon, water quality, soil quality, farming systems, soil, best management practices, climate change, carbon sequestration, carbon sinks, food security, soil management, biodiversity, land use, United Nations Framework Convention on Climate Change
Soil carbon (C) sequestration implies transferring of atmospheric CO2 into soil of a land unit through its plants. Co-benefits of soil C sequestration include: advancing food and nutritional security, increasing renewability and quality of water, improving biodiversity, and strengthening elemental recycling. Threshold level of soil organic C (SOC) in the root zone is 1.5–2.0%. SOC is influenced by land use, soil management and farming systems. To 1-m depth, more than 50% total C pool is contained between 0.3 and 1m depth. Soils of agroecosystems are strongly depleted of their SOC stock and are degraded. Restoring soil quality necessitates increasing SOC concentration by adopting best management practices (i.e., conservation agriculture) which create a positive C budget. French Government is proposing to COP-21 of UNFCCC in December 2015 that SOC concentration be increased globally at 4 per 1000 per year to mitigate climate change and advance food security.