<正>大气圈CO2 浓度及其同位素组成是不断变化的。植物在同化大气CO2 过程中产生碳同位素分馏 ,因此 ,树轮中稳定碳同位素比值 ( 13C/12 C)不仅是重建古气候的工具 ,也是过去大气CO2 浓度变化的敏感指示器。利用采自浙江西天目山的两株柳杉树轮稳定碳同位素 (δ13C)组成年序列 ,对 1 9世纪中叶以来大气CO2 浓度变化进行重建 ,其重建值与大气CO2 浓度的实测值较吻合

The stable carbon isotopic compositions of tree ring have been explored to study paleoclimatic variations, past atmospheric CO 2 level, and global carbon cycle. This paper analyzed the carbon isotopic ratios of two cryptomeria , collecting from West Tianmu Mountain, Zhejiang, and studied the tree ring carbon isotopic ratios evidence, for the atmospheric CO 2 concentration change after Industrial Revolution. The calculation of CO 2 construction fits well with the records. The tree ring carbon isotopic ratios well records the atmospheric carbon ratios change, which provides a good evidence for the CO 2 changes and a new means for the study on atmospheric CO 2 changes.