【作者】 周生路； 吴绍华； 王国梁；

【Author】 Zhou Sheng-lu~1 Wu Shao-hua~1 Wang Guo-liang~2 (1.School of Geographic and Oceanographic Science,Nanjing University,Nanjing 210093,China;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences,Yangling 712100)

【机构】 南京大学地理与海洋科学学院； 中科院水土保持研究所；

【摘要】 为揭示城市扩张影响下土壤重金属空间变异,选取江苏宜兴市为研究区域,在城乡交错带地区布设3条样带,采集表层土壤样品计24个并对重金属Hg、Pb、Cu和Zn含量进行了测定分析。结果表明:(1)城乡交错带土壤局部地区已发生了Hg污染和Pb、Cu累积现象。(2)Hg、Pb含量受城市扩张影响较大、空间分布较复杂,Cu、Zn含量受城市扩张影响较小、空间分布相对较简单。(3)Hg、Pb、Cu含量在空间呈带状各向异性,Zn呈几何各向异性;四种元素在城市扩张不同方向上的迁移和累积的特点有明显的差异。(4)Hg含量沿城乡方向上呈高、低、较高的变化趋势,城市一侧含量最高,与工业活动有关;乡村一侧较高,与农业施肥等因素有关。Pb含量沿城乡方向上有较为明显的递减规律,与沿城乡方向上交通工具活动密集度递减有关。Cu、Zn含量在城乡方向上的变化趋势不明显。更多还原

【Abstract】 To investigate influences of urban expansion on soil heavy metal spatial variability in the peri-urban zone,the study was conducted 3 soil sampling strips in an urban-rural region of Yixing city.Totally 24 samples of topsoils were collected and concentrations of heavy metals Hg,Pb,Cu and Zn in the soil samples were determined.The following results were found:(1) Statistical analysis of the test results indicated that there were a pollution of Hg and accumulation of Pb,Cu in the urban-rural region soils.(2) Influenced by urban expansion,the concentrations variation and spatial distribution of Hg,Pb were higher and more complicated than.Cu,Zn.(3) All the distribution patterns of Hg,Pb and Cu concentrations were zonal anisotropy,while the distribution pattern of Zn concentration was geometrical anisotropy.In different directions,the migration and accumulation of Hg,Pb, Cu and Zn had obvious difference.(4) The concentration of Hg along the urban and rural direction had a high,low and the higher variation trend,the concentration of Hg near the urban region was the highest for the industrial activities,followed by the concentration near the rural region for the using of fertilizer and pesticide,while the concentration in the midst of urban-rural region was the lowest.The concentration of Pb had declining trend from the urban to the rural for the decreasing trend of the vehicle emission from urban to rural region.On the other hand, the changes trend of Cu and Zn concentrations were not significant in urban-rural region.更多还原