地理科学 ›› 2006, Vol. 26 ›› Issue (3): 328-334.doi: 10.13249/j.cnki.sgs.2006.03.328

• 论文 • 上一篇    下一篇

南京江北地区晚更新世末期以来泥炭层δ13C记录的古气候变化

郑朝贵1,2, 朱诚1, 高华中1,3, 申洪源1,3, 马春梅1   

  1. 1. 南京大学城市与资源学系, 江苏 南京 210093;
    2. 滁州学院地理系, 安徽 滁州 239012;
    3. 临沂师范学院地理与旅游系, 山东 临沂 276005
  • 收稿日期:2005-02-03 修回日期:2005-07-11 出版日期:2006-05-20 发布日期:2006-05-20
  • 基金资助:
    国家自然科学基金项目(40271103)、安徽省教育厅自然科学研究项目(2005KJ021)。

Paleoclimatic Change Recorded by δ13C of Peat Stratum on North-bank of Changjiang River in Nanjing since Last Stage of Late Pleistocene Epoch

ZHENG Chao-Gui1,2, ZHU Cheng1, GAO Hua-Zhong1,3, SHEN Hong-Yuan1,3, MA Chun-Mei1   

  1. 1. Department of Urban and Resources Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. Department of Geography, Chuzhou University, Chuzhou, Anhui 239012;
    3. Department of Geography and Tourism, Linyi Teachers' College, Linyi, Shandong 276005
  • Received:2005-02-03 Revised:2005-07-11 Online:2006-05-20 Published:2006-05-20

摘要: 对南京江北地区林峰桥剖面晚更新世末期以来的两个泥炭层有机碳同位素测定结果表明,上部泥炭层和下部泥炭层δ13C值皆较低(≤-23.79‰),部泥炭层的δ13C值明显高于下部泥炭层。结合其它研究可知,该区全新世大暖期稳定暖湿鼎盛阶段的校正年代约在8.2~7.0 ka B.P.,在此阶段前后,表现为持续时间相对较短的低温气候环境。12.8~12.1 cal.ka B.P. 该区气温高低波动频繁期。12.8~12.7 cal.ka B.P.和12.6~12.2 ka B.P.两时段气温较低;2.7~12.6 cal.ka B.P. 阶段气温较高。12.2~12.1 cal.ka B.P. 表现为Younger Dryas之后气候的迅速增暖,可视为该区全新世开始的标志。

Abstract: Based on the analysis on the characteristics of the organic carbon isotope of the peat stratum in Linfengqiao profile on the north bank of the Changjiang(Yangtze) River in Nanjing since the last stage of the Late Pleistocene, it is shown that the δ13C values of both in the upper and lower peat stratum in Linfengqiao profile are lower than -23.79‰, and their organic matter is from C3 plants.The δ13C values of the upper peat stratum are higher than that of the lower.The result of 14C dating indicates that the upper peat stratum was mainly formed in the Holocene Megathermal and the lower peat stratum was mainly formed in the period of Younger Dryas.So it can be seen that the formation of peat does not absolutely lie on the climate changes.Combined with other research conclusions, it is confirmed that Holocene Megathermal Maximum was about between 8.2 cal.ka B.P.and 7.0 cal.ka B.P.in this area, before and after this period, the temperature had been down for a shorter time.During 12.8-12.1 cal.ka B.P., the temperature fluctuated frequently in this area.The temperature was lower in the two periods of 12.8-12.7 cal.ka B.P.and 12.6-12.2 cal.ka B.P., and they could contrast with the events of Older Dryas and Younger Dryas respectively.The temperature during 12.7-12.6 cal.ka B.P.was higher and it could contrast with the event of Allerod.In the period of 12.2-12.1 cal.ka B.P., it shows that after the event of Younger Dryas, the climate became warmer rapidly, so it could be regarded as the beginning of the Holocene.

中图分类号: 

  • P539.2