Soil Carbon

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  • Soil organic carbon (SOC)
    Soil organic matter (SOM) is the primary source of SOC, making up about 58% of it. SOM is a key factor in soil's role in the global carbon cycle. 
     
  • Soil carbon content
    Most upland soils have 0.5–3.0% organic carbon in their topsoil. Soils with less than 0.5% organic carbon are usually found in deserts. Soils with more than 12–18% organic carbon are considered organic soils. 
     
  • Soil carbon and ecosystem services
    SOC is important for many ecosystem services, including:
    • Providing food and fiber 
       
    • Regulating the climate 
       
    • Filtering and purifying water 
       
    • Providing habitats for biodiversity 

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