College of Resource and Environment, University of Jinan, Jinan, 250022, China.
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
Environ Sci Pollut Res Int. 2018 Jan;25(3):2417-2424. doi: 10.1007/s11356-017-0554-5. Epub 2017 Nov 9.
Surface soil samples collected from Nansi Lake catchment were analyzed for mercury (Hg) to determine its spatial trends and environmental impacts. Results showed that the average soil Hg contents were 0.043 mg kg. A positive correlation was shown between TOC and soil Hg contents. The main type of soil with higher TOC contents and lower pH values showed higher soil Hg contents. Soil TOC contents and CV values were both higher in the eastern catchment. The eastern part of the catchment, where the industry is developed, had relatively high soil Hg contents and a banding distribution of high Hg contents was corresponded with the southwest-northeast economic belt. Urban soils had higher Hg contents than rural soils. The urbanization pattern that soil Hg contents presented a decreasing trend from city center to suburb was shown clearly especially in the three cities. Soil Hg contents in Jining City showed a good consistency with the urban land expansion. The spatial trends of soil Hg contents in the catchment indicated that the type and the intensity of human activities have a strong influence on the distribution of Hg in soils. Calculated risk indices showed that the western part of the catchment presented moderately polluted condition and the eastern part of the catchment showed moderate to strong pollution level. The area with high ecological risk appeared mainly along the economic belt.
采集南四湖流域表层土壤样品分析汞（Hg），以确定其空间分布趋势和环境影响。结果表明，土壤 Hg 平均含量为 0.043mg/kg。TOC 与土壤 Hg 含量呈正相关。TOC 含量高、pH 值低的主要土壤类型 Hg 含量较高。流域东部土壤 TOC 含量和变异系数均较高。工业发达的流域东部土壤 Hg 含量相对较高，Hg 含量高的带状分布与西南-东北经济带相对应。城区土壤 Hg 含量高于农村土壤。Hg 含量表现出从市中心向郊区逐渐降低的城市化模式在这三个城市表现得尤为明显。济宁市土壤 Hg 含量的空间分布趋势表明，人类活动的类型和强度对土壤中 Hg 的分布有很强的影响。计算的风险指数表明，流域西部呈中度污染状态，东部呈中度至重度污染水平。高生态风险区主要出现在经济带沿线。
