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《Journal of Mianyang Teachers' College》 2017-08
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The Distribution Characteristics and Sources of Organic Carbon in Sediments of Caohai Lake

YANG Haiquan;CHEN Jingan;SONG Yilong;WANG Jingfu;LU Dingpan;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences;University of Chinese academy of Sciences;  
This study focused on the distribution characteristics and sources of organic carbon in sediments of Caohai Lake,a typical plateau lake in China. Stable carbon isotope( δ~(13)C),C: N ratio,total organic carbon( TOC) contents of 17 surface sediments and three sediment cores were analyzed. Our results showed that the contents of TOC in surface sediments varied from 6. 86% to 34. 85%,with a median of 23. 30 ± 7. 80%. The δ~(13)C ranged from-28. 49% to-18. 19%,averaged 23. 30 ± 2. 88%,while the C: N ratio ranged from 7. 36-11. 12,averaged 9. 13 ± 1. 17. The results indicated that primary production of phytoplankton was the main source of organic carbon in surface sediments in the east areas of Caohai Lake,the effect of terrestrial input and submerged plant was negligible. However,primary production of phytoplankton and submerged plants were the main sources in other lake areas. The contribution of submerged plants to TOC in surface sediments accounted for 49. 7%,while the contribution of primary production of phytoplankton was 48. 8%. The results of sediment cores in the east area showed that organic carbon in the upper sediments mainly originated from algae,but in bottom sediments from algae,terrestrial input and submerged plants. Besides,organic carbon in center area sediment core mainly came from algae and submerged plants,while in the outlet area almost came from submerged plants.
【Fund】: 贵州省科技重大专项计划项目(黔科合重大专项字[2016]3022-04)
【CateGory Index】: X171;X524
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