SONG Yi-long1,2, CHEN Jing-an1, YANG Hai-quan1,2, DING Wei3, TAO Hong-bo3, LUO Jing4, WANG Jing-fu1
1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;
4. China Aerospace Construction Group Limited Company, Beijing 100071, China
Abstract：Total organic carbon(TOC) content, total nitrogen(TN) content, and stable carbon isotope(δ13C) composition of surface and cored sediment samples from the Fuxian Lake in southwest China were determined to explore spatial temporal distributions and sources of the organic matter in the lake sediment. The results showed that TOC of surface and cored sediment samples were in the ranges of 2.02%~3.40% and 0.16%~0.36%, respectively, while TNs were in the ranges of 0.41%~6.63% and 0.08%~0.77%, respectively. As a whole, contents of TOC and TN were higher in the north part than in the south part of the lake, and both decreased as the sediment depth increased due to, probably, the increasing impact of anthropogenic activities. All evidences indicated that the primary production was the main organic carbon(OC) source of the sediment, and contributions of the terrestrial OC source were regionally dependent, and only played an important role in the south part of the Lake. In contrast to most other lakes, the C/N ratios of Fuxian lake sediment samples decreased gradually from the surface to the bottom of sediment columns, suggesting contributions of terrestrial OC were increasing. The more exogenous OC were found in sediments indicated that the soil erosion resulted from increased human activities in the lake area should be received more attentions.
Key words: Sediment Organic matter stable carbon isotope sources Fuxian Lake
E-Mail: chenjingan@vip.skleg.cn
Bulletin of Mineralogy, Petrology and Geochemistry Vol.35, No.4, 2016, page 618-624
