Journal
CHINESE SCIENCE BULLETIN
Volume 57, Issue 36, Pages 4753-4764Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-012-5500-9
Keywords
Tibetan Plateau; Nam Co; surface sediments; spatial distribution; sedimentary processes
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Funding
- National Basic Research Program of China [2012-CB956100]
- National Natural Science Foundation of China [41190082, 41071123]
- Knowledge Innovation Key Program of the Chinese Academy of Sciences [KZCX2-EW-113]
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In this study, 67 surface sediment samples collected from Nam Co in central Tibet were analyzed for total carbon, total organic carbon and total nitrogen, and 51 of these samples were also analyzed for n-alkanes. The origin and spatial distribution of organic matter were then investigated using these proxies, and the control factors responsible for the spatial distribution patterns and paleolimnological significance were discussed. The results indicated that the origin of organic matter in surface sediment of Nam Co is consistent with the sources of n-alkanes, which were primarily submerged plants, followed by terrestrial plants, and then aquatic algae and bacteria. The organic matter in surface sediments of the lake showed typical spatial variability. Because of the great influence of underwater topography, river inputs and water quality, the spatial distribution of organic matter is enriched from the source to the deposit center. This spatial variability of organic matter in the lake indicates that the sediments in different areas have different sensitivities to environmental changes, which is important to reconstruction of paleoenvironments and paleoclimate using lake sediment cores.
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