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湖泊沉积物中有机碳稳定同位素测定及其古气候环境意义
沈吉, 王苏民, 羊向东
中国科学院南京地理与湖泊研究所 南京 210008
摘要:
1991年5月，利用澳大利亚转动式采样器在江苏固城湖获得总长6.2m的完整柱状岩芯，以5cm间隔采样，对样品中有机质的稳定碳同位素研究表明，较低的δ13C值指示寒冷的气候环境；较高的δ13C值指示温暖的气候环境。该研究与岩芯中孢粉、硅藻所反映的气候环境十分吻合，因此湖泊沉积物中有机质的δ13C值具有一定反映气候冷暖波动的意义。
关键词:  湖泊沉积物  同位素  古气候
DOI：
分类号:
基金项目:中国科学院湖泊沉积与环境开放实验室资助项目，910018号
MEASUREMENT OF ORGANIC CARBON STABLE ISOTOPE IN LACUSTRINE SEDIMENTS AND ITS SIGNIFICANCE ON PALEOCLIMATE AND ENVIRONMENT
Shen Ji, Wang Sumin, Yang Xiangdong
Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Najing 210008
Abstract:
This paper reports use of stable isotopic; methods to study the lacustrine sediments collected in Gucheng Lake, Jiangsu Province in May, 1991. The paleoclimate can be reconstructed through the study of δ13C values in sedimentary organic materials. It can be concluded that smaller δ13C values indicate colder climate, and that larger values indicate warmer climate. This conclusion is in accordance with studies diatom and palynology. So the δ13C record -of sedimentary organic material is sensitive reflection of past climate change.
Key words:  Lacustrine sediment, Isotope, Paleoclimate
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