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Soil organic carbon (C) is the largest carbon reservoir at the earth's surface, but its mass is the least certain. The completed FAO Soil Map of the World yielded these estimates: 22 × 10 14 kg organic C in global soils, made up of 18 × 10 14 kg C in mineral soils and 4 × 10 14 kg C in the surface meter of peatlands.
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Hinrich L. Bohn (1982) studied this question.
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