School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430078, China.
School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China; Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan, 430078, China.
Environ Res. 2023 Dec 15;239(Pt 1):117380. doi: 10.1016/j.envres.2023.117380. Epub 2023 Oct 11.
Deciphering the temporal patterns of polycyclic aromatic hydrocarbons (PAHs) in sediment cores, and the effect mechanism of sedimentary organic matter (OM) and regional development model on PAHs are crucial for pollution control and environmental management. Herein, sediment core was collected from Chenhu international wetland in Wuhan, central China. Meanwhile, historical trend and source of PAHs and sedimentary OM were presented, respectively. Result demonstrated that the most significant growth of PAHs (increased by 158.8%) was attributed to the significant enhancement of traffic emission (5.57 times), coal combustion (4.59 times), and biomass burning (8.09 times). Similarly, the percentage of phytoplankton (stage Ⅲ: 37.9%; stage Ⅳ: 31.2%) and terrestrial C3 plants (stage Ⅲ: 24.6%; stage Ⅳ: 29.2%) to sedimentary OM hold the dominant position after the stage Ⅱ. The obvious shifts of historical trend and sources in PAHs were highly related to economic development models (r = 0.72, p < 0.001) and sedimentary OM (r = 0.82, p < 0.001). It demonstrated that eutrophication of lake accelerated the burial of PAHs. Redundancy analysis results suggested that TOC was dominating driver of sedimentary PAHs (16.56%) and phytoplankton occupied 9.58%. To further confirm the significant role of economic development models, three different historical trends of PAHs in different regions of China were presented. The result of this study provides the new insight into the geochemistry mechanism of lake sedimentary OM and PAHs. Meanwhile, the relationship of regional development model and sedimentary PAHs was highlighted in this study. Significantly, the main environmental implications of this study are as follows: (1) lake eutrophication of phytoplankton OM accelerated the burial of PAHs in lake sediment; (2) economic development models and energy structure significantly influence the sedimentary PAHs. This study highlights the coupling relationship between OM burial and PAHs sedimentation, and the importance of accelerating the transformation of economic energy structure.
解析沉积物中多环芳烃（PAHs）的时间格局以及沉积有机质（OM）和区域发展模式对 PAHs 的影响机制，对于污染控制和环境管理至关重要。本研究采集了中国中部武汉市沉湖国际湿地的沉积物岩芯，分别呈现了 PAHs 和沉积 OM 的历史趋势和来源。结果表明，PAHs （增加了 158.8%）的显著增长归因于交通排放（增加了 5.57 倍）、煤炭燃烧（增加了 4.59 倍）和生物质燃烧（增加了 8.09 倍）的显著增强。同样，在阶段Ⅱ之后，沉积 OM 中浮游植物（阶段Ⅲ：37.9%；阶段Ⅳ：31.2%）和陆生 C3 植物（阶段Ⅲ：24.6%；阶段Ⅳ：29.2%）的比例占主导地位。PAHs 历史趋势和来源的明显变化与经济发展模式（r = 0.72，p < 0.001）和沉积 OM（r = 0.82，p < 0.001）高度相关。这表明湖泊富营养化加速了 PAHs 的埋藏。冗余分析结果表明，TOC 是沉积物 PAHs 的主要驱动因素（占 16.56%），浮游植物占 9.58%。为了进一步证实经济发展模式的重要作用，呈现了中国不同地区 PAHs 的三种不同历史趋势。本研究为湖泊沉积 OM 和 PAHs 的地球化学机制提供了新的见解。同时，本研究强调了区域发展模式与沉积 PAHs 的关系。本研究的主要环境意义如下：（1）湖泊富营养化导致浮游植物 OM 加速了湖泊沉积物中 PAHs 的埋藏；（2）经济发展模式和能源结构对沉积 PAHs 有显著影响。本研究强调了 OM 埋藏和 PAHs 沉降之间的耦合关系，以及加速经济能源结构转变的重要性。
