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冰川冻土 ›› 2002, Vol. 24 ›› Issue (5): 512-516.doi: 10.7522/j.issn.1000-0240.2002.0088

• 冰冻圈与全球变化 • 上一篇    下一篇

临夏塬堡全新世黄土剖面古土壤有机质碳同位素的气候记录

何勇, 秦大河, 任贾文, 李凤霞   

  1. 中国科学院, 寒区旱区环境与工程研究所冰芯与寒区环境重点实验室, 甘肃, 兰州, 730000
  • 收稿日期:2002-06-02 修回日期:2002-08-02 出版日期:2002-10-25 发布日期:2012-04-26
  • 基金资助:
    国家重点基础研究发展规划项目(G1999043401);中国科学院知识创新工程重大项目(KZCX-Y-05)资助

The Climatic Record of Organic Matter in the Paleosol from the Yuanbao Holocene Profile

HE Yong, QIN Da-he, REN Jia-wen, LI Feng-xia   

  1. Key Laboratory of Ice Core and Cold Regions Environment, CAREERI, CAS, 730000, China
  • Received:2002-06-02 Revised:2002-08-02 Online:2002-10-25 Published:2012-04-26

摘要: 对甘肃临夏塬堡全新世剖面古土壤有机质碳同位素分析表明, δ13C变化范围在-28.23‰~2.19‰之间, 平均值为-26.88‰. 结合该剖面孢粉分析结果, 观察到在孢粉所反映的温暖湿润气候期间,δ13C表现为高值, 而在干燥寒冷期间, δ13C表现为低值. 说明由于气候变化引起了地表植被类型的改变, 导致了古土壤中有机质δ13C发生了变化. δ13C的变化特征分别对应于3个不同的气候演化阶段:早全新世、中全新世和晚全新世阶段, 其所反映的全新世气候特征与我国其它地区的分析结果基本一致. 分析表明, 古土壤中有机质δ13C是气候变化的一个良好指标.

关键词: 全新世, 古土壤, 有机质碳同位素, 气候变化

Abstract: On the basis of the carbon isotope analysis of organic matter in the paleosol from the Yuanbao Holocene Profile, the values of δ13C are observed between -28.23 ~ -25.19‰, with the average of -26.88‰. Combining the pollen record, it is found that the higher values of δ13C corresponds to warm and humid climate condition, and the lower values corresponds to cold and arid climate condition, which suggests that the climate change has resulted in the changes in δ13C and vegetation types. Three Holocene stages can be recognized from the variation in the characteristics of δ13C in the Yuanbao Holocene Profile. The Holocene climate features recorded in the profile were similar with those in other places of China. The carbon isotope of organic matter in the paleosol is also suggested as an indicator for climate change.

Key words: Holocene stage, paleosol, carbon isotope, climate change

中图分类号: 

  • P532