Early diagenesis of organic matter in the water column and sediments: Microbial degradation and resynthesis of lipids in Lake Haruna |
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| Institution: | 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;3. Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, China University of Geosciences, Beijing 100083, China;4. Key Laboratory for Shale Gas Exploitation and Assessment, Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China;5. School of Geosciences, China University of Petroleum, Qingdao 266580, China;6. Zhongyuan Oilfield Co. Ltd., SINOPEC, Oil Recovery Plant No.3, Puyang 066004, China;1. Environment Research Institute, Shandong University, Jinan 250100, China;2. School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;3. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China |
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| Abstract: | Particulate matter, sediment trap, and surface sediment samples collected in freshwater Lake Haruna were studied to understand early diageesis of organic materials in the water column and in bottom sediments. The samples were analyzed for biomarkers, including aliphatic and aromatic hydrocarbons, fatty alcohols, saturated and unsaturated fatty acids, β- and ω-hydroxyacids, and α,ω-dicar?ylic acids. Decreases in concentrations of autochthonous saturated C12–C19 fatty acids and polyunsaturated C18 acids relative to TOC occured with the settling of organic matter ot the lake bottom, whereas the amounts of terrestial saturated C20–C30 acids remained almost constant. Conversely, the concentrations of monosaturated fatty acids, branched chain fatty acids, and β- and ω-hydroxyacids, which are probably produced by microbial activity, increased. These results indicate that preferential degradation of algal lipids accompanies microbial resynthesis of lipids during settling, however, terrigenous lipids are relatively stable. |
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