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Degradation of organic matter in the sediments of Hongfeng Reservoir

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Chinese Science Bulletin

Abstract

In this work, the distribution of organic carbon, DNA and lipids in the sediments of Hongfeng Reservoir were described in addition to SO 2−4 profile in pore water. The contents of organic carbon in the sediments range from 23.3 to 76.8 mg-g−1, with the peak value appearing at the depth of 8 cm bellow the sediments water interface (SWI), and tend to decrease gradually with sedimentation depth. The concentrations of SO 2−4 decreased from 40.50 mg.L1− to 12.00 mg.L−1 at SWI in top 4 cm sediment, and was kept at 12.0 mg.L−l bellow that depth. Newly produced organic carbon can be conserved as long as 14 years in the sediments. The contents of DNA were relatively high in top 9 cm surface sediments, as revealed by agarose gel images, close to those of organic carbon and sulphate reduction index (SRI). This study shows that bacteria played an important role in organic matter degradation; SO 2−4 is the primary electron acceptor under anaerobic condition in this reservoir; DNA in the lake sediments can provide important information for the study of cycling of nutrient elements in the lake.

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Authors and Affiliations

  1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China

    Zhongqing Wei, Congqiang Liu, Xiaobing Liang, Fushun Wang & Shaofeng Wang

  2. Graduate School of the Chinese Academy of Sciences, 100039, Beijing, China

    Zhongqing Wei & Shaofeng Wang

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  1. Zhongqing Wei
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  2. Congqiang Liu
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  3. Xiaobing Liang
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  4. Fushun Wang
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  5. Shaofeng Wang
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Correspondence to Congqiang Liu.

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Wei, Z., Liu, C., Liang, X. et al. Degradation of organic matter in the sediments of Hongfeng Reservoir. Chin.Sci.Bull. 50, 2377–2380 (2005). https://doi.org/10.1007/BF03183750

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  • DOI: https://doi.org/10.1007/BF03183750

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