Research Progress of Soil Organic Carbon Transfer to Soil Inorganic Carbonates in Forest and Grassland Soil in Northwest Arid Areas
The soil carbon in arid regions is an important component of the global carbon pool.Northwest arid area includes larger proportion soil inorganic carbon.Through the SOC-CO2-SIC micro-carbon cycle,the soil organic carbon can transfer to the soil inorganic carbon.To study the migration and transformation process and estimate the transfer amount can expose part of the missing carbon sink.This paper described the mechanism of the transfer and introduced several methods to calculate the amount of carbon transfer.We contrasted to these methods,and expounded the biogeochemical ways of stable isotope techniques.Problems existed in the research were discussed.It was found the few research was carried out in the area.Many uncertainties existed in the process of calculating the amount of carbon transfer and the distinction from CO2 of soil.Most results were only from estimation.It was suggested that the study of impact factor of the SOC transfer to the SIC should be strengthened to reduce the test errors.