| 摘要: |
| 作者依据2019年8月份莱州湾海洋沉积物调查资料，分析了该海域表层沉积物粒径组成、重金属时空分布特征并评价了其生态风险。结果显示，莱州湾沉积物分为砂质粉砂、粉砂、粉砂质砂和砂4种类型，以砂质粉砂为主，其次为粉砂与粉砂质砂，再次为砂，中值粒径平均58.956μm；表层沉积物中Cr、Zn、Pb、Cu、As、Cd、Hg和TOC平均含量分别为57.6、52.6、18.7、15.3、9.14、0.130、0.0234 mg/kg和0.222%；由于河流排海物质和莱州湾内潮流运动，导致Cu、Pb、Zn、As、Cr和Cd基本呈现中部海域含量较高，西部海域高于东部海域的特征，东南部海域Cd、Hg与矿产资源的开发相关；14.3%的站位综合潜在生态风险属于中生态风险，Cd对综合潜在生态风险指数的贡献率最高，为主要潜在生态风险因子；研究区域中重金属Cu、Zn含量的分布与沉积物粒径和有机碳的含量密切相关。 |
| 关键词: 莱州湾 沉积物 粒度 分布特征 重金属 生态风险评价 |
| DOI：10.11759/hykx20200806004 |
| 分类号:X820.2 |
| 基金项目:国家重点研发计划资助项目（2018YFC1407601、2018YFC1407605）；山东省重点研发计划资助项目（2019JZZY020705） |
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| Distribution characteristics of grain size and heavy metals of sediments in Laizhou Bay |
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ZHAO Yu-ting, SUN Shan, YOU Li-ping, SU Bo, MA Yuan-qing, WANG Li-ming, QI Yan-min, ZHANG Yun-chang
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Shandong Marine Resource and Environment Research Institute, Shandong Key Lab of Marine Ecological Restoration, Yantai 264006, China
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| Abstract: |
| Based on the geochemical properties of the sediments observed in Laizhou Bay in August, 2019, the temporal and spatial characteristics of granulometric distribution, heavy metals concentration, and organic carbon content in the surface sediments were analyzed. The results showed that the contents of silt and sand were higher than that of clay, and their median diameter was 58.956 μm; the average concentrations of Cr, Zn, Pb, Cu, As, Cd, and Hg were 57.6, 52.6, 18.7, 15.3, 9.14, 0.130, and 0.023 4 mg/kg, respectively, and the TOC was 0.222%. Due to the river discharge materials and tidal current movement in Laizhou Bay, the concentrations of Cu, Pb, Zn, Cr, and Cd in the central sea area were higher than those in the eastern sea area. Cd and Hg contents in the southeast sea area were related to the development of mineral resources. The potential ecological risk was moderate in 14.3% of the stations studied. Cadmium was determined as the principal ecological risk factor, and its contribution ratio was the highest among the seven studied elements. Pearson’s correlation analysis on the environmental factors revealed that sediment grain size and organic carbon content were important factors in the distribution of heavy metals such as copper and zinc. |
| Key words: Laizhou Bay sediment grain size granulometric distribution heavy metals ecological risk assessment |
