Influencing factors and partitioning methods of carbonate contribution to CO2 emissions from calcareous soils

In calcareous soils, recent studies have shown that soil-derived CO2 originates from both soil organic carbon (SOC) decomposition and inorganic (SIC) dissolution, a fact often ignored in earlier studies. This may lead to overestimation of the emissions SOC decomposition. there is chemical balance between precipitation dissolution CaCO3-CO2-HCO 3 − , which affected by environmental factors (moisture, temperature, pH depth), root growth (rhizosphere effect) agricultural measures (organic materials input, nitrogen fertilization straw removal). this paper, we first introduced contribution SIC soils their driving factors. Second, reviewed methods distinguish two sources released quantify 13C fractionation coefficient SIC-derived SOC-derived CO2, partition three with plants input. Finally, proposed for accurately distinguishing soils. review helps improve accuracy C assessment also proposes direction further investigations on responses abiotic measures.