Abstract: Through the field investigation of physical properties of the salinialkani soil in West Jilin Province and the stable carbon isotopic analysis of carbonates in salinialkani soil,the results show that the δ¹³C value of the soil carbonates can reflect the developing tendency of the soil saliniation.In the shallow soil with the depth of 0~50 cm below the ground surface,the extent from 0 to 50 centimeters, the change of the δ¹³C of the soil carbonate is positively related with the depth in the upper soil profile from 0~30 cm,but it will increase rapidly in the lower soil profile as the result of the existence of salined and alkali soil layer.

Key words: West Jilin Province, salinialkani soil, soil carbonate, stable carbon isotope