Relationships between Source Inputs and Lipid Geochemistry of Lake Sediments on the Northern Tibetan Plateau, China,Geomicrobiology Journal

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Relationships between Source Inputs and Lipid Geochemistry of Lake Sediments on the Northern Tibetan Plateau, China
Geomicrobiology Journal ( IF 2.2 ) Pub Date : 2020-05-13 , DOI: 10.1080/01490451.2020.1764674
Chenjun Wu ₁ , Jincai Tuo ₁ , Ru Chen ₁ , Mingfeng Zhang ₁ , Yan Liu ₁

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Abstract Surface sediment samples were collected along the margins of Lakes Dachaidan, Xiaochaidan, Gahai (Delinha), Chaka, Gahai, and Qinghai, and from the Jinyingtan peat deposit, to study the lipid geochemistry of sediments on the Tibetan Plateau, China. TOC contents of the lake sediments varied in different saline lakes, with higher values in Lakes Qinghai and Gahai, which may be related to low salinity and abundant aquatic organisms. Fatty acids and n-alkanes were the two most abundant lipid constituents. Fatty acids were dominated by short-chain, indicating they were mainly from aquatic organisms, algae and bacteria organic matter. n-Alkanes were dominated by mid-chain and long-chain n-alkanes, and were derived mainly from aquatic macrophytes and terrestrial plants. The carbon isotopic compositions of short-chain, branched, unsaturated and cyclic fatty acids, and short-chain n-alkanes show an increasing trend in lake sediment samples from less saline lakes to more saline lakes. In less saline lakes, δ13C values of algae-sourced compounds show relatively enriched 12C, because of higher primary production and CO2 assimilation. The δ13C values of long-chain fatty acids and mid-chian/long-chain n-alkanes are positively correlated and show no obvious change from west to east, indicating similar macrophytes and terrestrial higher plants input in the studied samples.

更新日期：2020-05-13

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