Storage and spatial distribution of organic and inorganic carbon in the topsoil of Loess Plateau

Through selecting the surfer soil samplings in Loess Plateau in Shaanxi Province,we analyzed the spatial distribution of the contents organic carbon and inorganic carbon and carbon storage in Shaanxi Province.The results showed that the average concentration of organic carbon and inorganic carbon were 5.41g/kg and 17.04g/kg,the spatial distribution of organic carbon was showing an increasing trend from north to south,consistent with its environment,while the spatial distribution of inorganic carbon also presented the growing trend from north to south along the latitude,especially north of latitude 36o;Using the CaCO3 contents and regional average rainfall and temperature to conduct a linear fitting,we found the fitting coefficients were only 0.367 and 0.297,respectively,correlation between carbonate content and rainfall and temperature were not significant.The storage of organic carbon(0.278 Pg) was larger than the inorganic carbon(0.877Pg) in surface soil in Shaanxi Province.The reason for that phenomenon was related to the arid environment.