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Relief and calcium from gypsum as key factors for net inorganic carbon accumulation in soils of a semiarid Mediterranean environment


• Gypsum is a driving factor for net inorganic C accumulation in soil

• Relief determines the distribution of Ca2+-gypsum in soil

• Soil organic C pool stores more CO2 than the inorganic C pool

• The Sr2+/Ca2+ ratio is a quick indicator to recognise soil secondary carbonates.