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Carbon isotope composition of peats in wetlands has been widely studied to understand paleoenvironment. In this study carbon isotope ratio (^<13>C/^<12>C) of the holocellulose and lignin components of peat in the Ozegahara Wetland were measured separately. The δ^<13>C values of the untreated peat show a decrease with the sampling depth. The reason for the decrease has been proved that the lignin compornent having lower δ^<13>C value became more dominant with the increasing depth. Lignin is more preservative than holocellulose and it is considered that the δ^<13>C value of lignin gives more straightforward information of paleoenvironment. The change of the δ^<13>C value resembles that of the burial rate based on ^<14>C-age, which is corrected assuming that only holocellulose have decayed exponentially. It is likely that the growth of plants in the Ozegahara Wetland increased between 7000 to 2000 years before present.
タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1996 (平成8)年度
名古屋大学加速器質量分析計業績報告書 8 146-151, 1997-03