Editing Soil organic carbon stock (section)

== Boundary Conditions ==
Boundary inclusions encompass all organic carbon contained within soil organic matter fractions in mineral and organic soils, including carbon derived from plant residues, microbial biomass, and humified organic compounds. The signal includes carbon stored across soil horizons within the defined depth range relevant to ecosystem carbon assessments. Boundary exclusions omit inorganic carbon forms such as carbonates, aboveground biomass carbon, and carbon in aquatic sediments or peatlands unless explicitly classified as soil. The signal does not include transient carbon fluxes such as dissolved organic carbon in soil water or atmospheric carbon pools.