Research on the carbon isotopic composition of organic matter from Lake Chenghai and Caohai Lake sediments |
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| Authors: | Zhengjie Zhu Jing’an Chen Yan Zeng Hang Li Hui Yan Shicong Ren |
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| Institution: | (1) Department of Geological Sciences, The University of Michigan, 1100 North University Avenue, Ann Arbor, MI 48109-1005, USA |
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| Abstract: | The carbon isotopic composition of organic matter from lake sediments has been extensively used to infer variations in productivity.
In this paper, based on the study of the contents and δ13C values of organic matter in different types of lakes, it has been found that δ13C values of organic matter have different responses to lake productivity in different lakes. As to the lakes dominated by
aqutic macrophytes such as Lake Caohai, organic matter becomes enriched in 13C with increasing productivity. As to the lakes dominated by aquatic algae such as Lake Chenghai, δ13C values of organic matter decrease with increasing productivity, and the degradation of aquatic algae is the main factor
leading to the decrease of δ13C values of organic matter with increasing productivity. Therefore, we should be cautious to use the carbon isotopic composition
of organic matter to deduce lake productivity. |
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| Keywords: | Lake Chenghai Lake Caohai δ13C value organic matter productivity |
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