• 关键词：城市边缘带  土壤重金属  空间分布  评价

• 基金项目：中国科学院知识创新工程重要方向(No.KZCX3-SW-427)；国家自然科学重点基金(No.40235054)；欧盟合作项目“城乡交错区农业可持续发展研究” (RURBIFARM, No: ICA4-CT-2002-10021)

• 陈杰
• 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008

• 邓文靖
• 中山大学环境科学与工程学院, 广州 510275

• 檀满枝
• 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008

• 摘要：为揭示城市边缘带强烈人为活动对土壤环境质量的影响，以南京化工园附近20km2区域为研究区，网格化精确布点，采集表层土壤样品共计54个，并对其重金属Cu、Zn、Pb、Cr、Cd、Hg、As含量进行了测定分析.结果表明，研究区表层土壤中除Hg 外的其它6种重金属含量均未超过国家二级标准；Hg是本区表层土壤重金属污染的主要因子.另外，应用地统计学的克里格方法对研究区内表层土壤污染的空间变异特征进行了分析，并讨论了研究区域的潜在污染源及其污染途径.结果表明，研究区内局部土壤重金属污染主要由蔬菜土壤高强度利用及农化产品投入所致，同时不排除污染水灌溉的影响.

• Abstract：To investigate influences of intensive human activities on soil environment dynamics in the peri-urban zone, it was conducted in an area of 20km2 in the vicinity of the Nanjing Chemical Industrial Park. Totally 54 samples of topsoil were collected in an aerophoto-based gridding design and the concentrations of heavy metals Cu, Zn, Pb, Cr, Cd, Hg and As in the soils sampled were analyzed. First of all, the results of statistical analysis indicated that concentrations of the heavy metals detected in the studied soils did not exceed the safety values of national soil quality criteria with the exception of Hg. Although the concentrations of a few metals in the some sampled sites slightly exceeded their average background values, the spatial variations of the concentrations of those metals, however, paralleled the pedo-geochemistry of the study area. Hg concentration in the soils from 37% of the sampled sites was higher than environmental safety criteria according to the national soil quality standard, suggesting that Hg might be considered as a dominant element causing soil heavy metal pollution in the area. Furthermore, the spatial variability of soil pollution in terms of heavy metals was investigated by combining pollution evaluating with geostatistical methods, and potential sources and possible entrance paths of heavy metal pollutants in those plots with measurable pollution were discussed. It was preliminarily concluded that intensive application of metal-containing agrochemicals during long-term vegetable planting was the major cause leading soil heavy metalpollution. The possibility, however, that irrigation by contaminated surface water and land application of organic composts derived from a variety of wastes and sludge also significantly contributed to soil heavy metal pollution in some cases, could not be excluded.

• Key words：Peri-urban  soil heavy metals  spatial variation  assessment

• 
  摘要点击次数： 1668 全文下载次数： 3215