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本文采样分析了承德市油松年轮中δ１３Ｃ值自工业革命以来的变化，用以揭示我国北方大气ＣＯ２浓度的变化规律。结果表明：承德市油松年轮中的δ１３Ｃ值自１８１０年以来平均下降了０．８３９‰，下降范围０．６８２‰～１．１２０‰，指示了大气ＣＯ２浓度逐渐升高的特点。δ１３Ｃ值与历史时期全球大气ＣＯ２浓度之间存在显著相关关系（ｒ＝－０．５６０９，Ｐ＜０．０１）。应用树木年轮δ１３Ｃ值与大气ＣＯ２浓度之间的关系式，推测出我国北方大气ＣＯ２浓度从工业革命以前的约２７８．４μｍｏｌｍｏｌ－１上升到目前的３４０μｍｏｌｍｏｌ－１。从而为我国的全球变化研究提供了ＣＯ２浓度历史变迁方面的证据。
This paper sampled and analyzed the δ13C value of Pinus tabulaeformis in Chengde city since the industrial revolution, to reveal the variation law of CO2 concentration in northern China. The results show that the δ13C value of Pinus tabulaeformis rings in Chengde city has decreased by 0.839 ‰ on average since 1810, with a decrease of 0.682 ‰ ~ 1.120 ‰, indicating the gradual increase of atmospheric CO2 concentration. There was a significant correlation between δ13C value and global atmospheric CO 2 concentration during the historical period (r = -0.5609, P <0.01). Using the relationship between δ13C value of tree rings and atmospheric CO2 concentration, it is inferred that the atmospheric CO2 concentration in northern China rose from about 278.4μmolmol-1 before the Industrial Revolution to the present 340μmolmol-1. Thus providing evidence of the historical changes of CO2 concentration for our country’s global change research.