| 引用本文: | 宿苧仁,Emilie Jardé,尹月鹏,Marine Liotaud,张雯.基于脂质生物标志物评估河道型水库表层沉积物有机质来源.湖泊科学,2024,36(1):137-148. DOI:10.18307/2024.0126 |
| Su Ningren,Emilie Jardé,Yin Yuepeng,Marine Liotaud,Zhang Wen.Sedimentary organic matter of channel type reservoirs: Input of lipid biomarker for source assessment. J. Lake Sci.2024,36(1):137-148. DOI:10.18307/2024.0126 |
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| 摘要: |
| 水电开发导致河岸生境破碎化程度加剧和水库沉积物截留问题日益突出,而目前关于河道型水库有机质(OM)溯源及分布特征的研究较少,进而造成OM在水库复杂环境介质中迁移机理尚不清楚。本研究将脂质生物标志物分析方法应用于大渡河瀑布沟水库表层沉积物,经过气相色谱-质谱法对沉积物OM脂质组分进行了分析,将其量化并分为自然、成岩、热源和污水标志物4种来源。结果表明:OM平均含量坝前(10.7%±4.8%)>坝后(7.3%±0.9%)>库中(6.7%±1.8%),说明水库对沉积物OM的截留有显著影响。可提取脂质组分主要来源于自然标志物(45.9%±13.9%),碳偏好指数、陆源/水生比和陆生与水生植物输入比显示OM主要来源于陆生高等植物,占自然定量分子的70.5%±9.1%。此外,坝前汉源城镇下游D6和D7点位人为标志物(44.6%±25.1%)分子明显比自然标志物(24.2%±3.7%)含量高,并进一步通过比例研究强调了污水标志物的贡献率较为突出(31.6%±12.8%),这与该地住宅区生活污水处理设施覆盖率较低相关,表明OM污染源组成变化与水库滞留效应的耦合作用有关。 |
| 关键词: 有机质 水库 脂质生物标志物 来源 分布特征 |
| DOI：10.18307/2024.0126 |
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| 基金项目:国家自然科学基金项目(42007148,42377082)、国家环境保护水土污染协同控制与联合修复重点实验室开放基金项目(GHBK-006)、地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2023K029)、长江生态环境保护修复联合研究二期项目(2022-LHYJ-02-0201)和四川省自然科学基金项目(2023NSFSC0799)联合资助。 |
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| Sedimentary organic matter of channel type reservoirs: Input of lipid biomarker for source assessment |
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Su Ningren1, Emilie Jardé2, Yin Yuepeng1, Marine Liotaud2, Zhang Wen1
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1.College of Environment and Ecology, State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil and Water Pollution(SEKL-SW), State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, P.R. China;2.CNRS, Univ Rennes, Géosciences Rennes, UMR 6118, Rennes 35000, France
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| Abstract: |
| Hydropower development has increased the degree of fragmentation of riparian habitats and the problem of reservoir sediment trapping. However, there is limited research on the source and distribution characteristics of organic matter (OM) in river reservoirs. Therefore, the migration mechanisms of OM in reservoirs remain unclear. In this study, the lipid biomarker analysis method was applied to surface sediments of Pubugou Reservoir in Dadu River. Sediment OM lipid components were analysed by gas chromatography-mass spectrometry (GC-MS), and were quantified and classified into four sources: natural, petrogenic, pyrogenic and sewage markers. The results showed that the average content of organic matter (OM) in the upstream area of the dam (10.7%±4.8%) was higher than that in the downstream area of the dam (7.3%±0.9%) and within the reservoir (6.7%±1.8%), indicating the impact of reservoir interception on the accumulation of sedimentary OM. The extractable lipid fraction was mainly derived from natural markers (45.9%±13.9%). The OM was represented by the relative ratio of carbon preference index, terrestrial/aquatic ratio and terrestrial/aquatic plant input ratio. It came mainly from terrestrial higher plants, accounting for 70.5%±9.1% of the natural quantitative molecules. In addition, the number of anthropogenic marker molecules increased significantly (44.6%±25.1%) compared to natural markers (24.2%±3.7%) at sites downstream of the dam in Hanyuan. Further proportion studies revealed the contribution of sewage markers (31.6%±12.8%) due to the low coverage of domestic sewage treatment plants in the residential area. Our study provides a certain theoretical basis for the coupling effect between the compositional change of OM pollution sources and the retention effect of the reservoir. |
| Key words: Organic matter reservoir lipid biomarkers source apportionment distribution characteristics |
