Abstract:The 10-, 15-, 20- and 25-year-old mixed alder (Alnus cremastogy ne)cypress (Cupressus funebris) plantations and the 30-year-old pure c ypress plantation succeeded from mixed alder-cypress plantation in the hilly area of central Sichuan Basin were chosen as test objects to study the dynamic changes and allocation patterns of their carbon storage. The results showed that the vegetation carbon storage in mixed aldercypress plantations increased continually from the age stage of 10- to 30-year, and reached 52.40 t·hm-2 at the age stage of 30-year. The vegetation carbon storage of arbor layer at each age stage was more than 85.59% of the total, and the soil carbon storagewithin 0-40 cm layer increased significantly (P<0.05) from the age stage of 10- to 15-year, with the maximum (84.79 t·hm-2) at the age stage of 15-year, but decreased significantly (P<0.05) from the a ge stage of 15- to 25-year and tended to stable from the age stage of 25- to 30-year (P>0.05). The carbon storage of the mixed alder-cypress planta tions increased significantly from the age stage of 10- to 15-year, with the m aximum (118.13 t·hm-2) at the age stage of 15-year, but declined from t he age stage of 15- to 25-year while increased slightly from the age stage of 25- to 30-year. The proportion of vegetation carbon storage increased continually from the age stage of 10- to 30-year, whereas that of soil carbon storage was in adverse. Comparing with other types of plantations in China, mixed alder-cypress plantation had a lower storage of carbon.