Advances in Research of Soil Inorganic Carbon

Soil organic carbon(SOC) is the only carbon pool in most researches of soil carbon pool concerning global carbon cycling,while soil inorganic carbon(SIC) is given very little attention.SIC is one of the main forms of carbon in earth sub-surface,especially in semi-and arid zones.Carbonate,either inherited from parent rocks or generated during soil formation processes,is the main form of SIC.This review describes the composition,sources,and formation model of soil carbonate,the relationships were analyzed between SIC and SOC in the global carbon cycling,and finally brought forward some suggestions relating the research of SIC.