吉林西部全新世晚期土壤碳酸盐中碳稳定同位素记录的古气候信息

Compostion of Carbon Isotopes in Soil Carbonates and Paleoclimate Recoreds of The Late Holocene in the West of Jilin,China

土壤碳酸盐中碳稳定同位素是记录古气候变化信息的重要载体。本文对吉林省西部大安市姜家甸草场土壤剖面中的δ13C值特征进行了详细分析,并在此基础上推得C3、C4植物生物量;结合野外观察到的剖面特征,作者认为全新世晚期以来,该地区气候曾经历过从干-热～湿-暖～干-热的演变过程。现今吉林西部的干旱化环境正是全新世晚期以来气候持续演化的结果。

Carbon isotope in soil carbonates is an important paleoclimate data carrier. In this paper δ^(13)C values of a soil section in the Jiangjiadian grassland has been analyzed in details. Based on the measurement, the authors calculated the proportion of C3 and C4 plants during the period of section coming into being, and concluded that the climate since Late Holocene epoch in the West of Jilin changed from dry-hot through wet-warm to dry-hot again. The results are well comparable to the characters of the soil section.