• 关键词：城乡交错区  IDW空间插值  全量  形态  来源特征

• 基金项目：国家自然科学基金项目(No.41301336);河南省教育厅科学技术研究重点项目(No.13A610064);河南大学资源与环境研究所项目(No.HD-ZHS-201405)

• 陈志凡
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 范礼东
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 陈云增
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 邢立腾
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 杨玉洁
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 向哲涛
• 河南省郑州市环境应急与事故指挥中心, 郑州 450007

• 王小莉
• 1. 河南大学资源与环境研究所, 开封 475004;2. 河南省高校重点学科环境变化与水土污染防治开放实验室, 开封 475004

• 摘要：开展城乡交错区农田土壤重金属空间变异及其源解析研究,对于维护农田生态系统健康与合理进行土地利用规划具有重要意义.以河南省某市东郊城乡交错区为例,采用200m×200m网格布点法采集表层土壤样品共259个.用ICP-MS测定了土壤重金属(Cd、Zn、Pb、Cu、Cr和Ni)含量,基于Arcgis10.1采用IDW插值法分析研究区表层土壤重金属空间变异特征,并结合Tessier的形态提取法分析不同区域重金属的来源特征.结果表明:研究区表层土壤中重金属Cd、Zn、Pb与Cu的含量变异性较为显著,且明显高于对照区.空间分布上,在化工厂与排污河附近存在明显的高浓度区,污灌与化工厂等排污河水的侧渗是造成农田污染的首要原因,化工企业的降尘对农田污染起到了耦合效应;且在这些区域重金属Cd、Zn、Pb和Cu的非残余态含量较高,具有较高的活性和生物可利用性,存在较高的潜在健康风险.而本研究未发现火电厂周围和铁路两侧等农田土壤中有明显的重金属积累现象,且在这些样区重金属多以较稳定的形态存在,活性较低,存在较低的潜在健康风险.除工业源、交通源外,农业源中化肥的不同施用量对土壤中重金属的空间差异也产生了一定的影响.

• Abstract：Understanding spatial distribution and identifying heavy metal sources in agricultural soils are crucial for farmland maintenance, ecosystem health, and land use planning in a peri-urban area. Samples of topsoils (n＝259) were collected from a peri-urban area in Henan province using a 200 m×200 m grid method. The concentrations of Cd, Zn, Cu, Pb, Ni and Cr in soils were determined by ICP-MS. Spatial distribution and source analysis of heavy metals were conducted using inverse distance weighting (IDW) interpolation combined with Tessier's speciation extraction method. The results show that: 1) the concentrations of Cd, Zn, Cu and Pb varied within the sampling sites, and obviously higher than concentrations in the control area, and 2) there are clearly higher concentrations of heavy metals near the chemical plants and sewage river. These are the primary sources of heavy metals that lead to farmland pollution due to sewage irrigation, side infiltration by the sewage river water, and via a coupling effect with particles emitted from the chemical plants. Heavy metals (Cd, Zn, Pb and Cu) have higher activity and bioavailability due to higher proportion of non-residual forms, suggesting potential health risks are likely in these areas. However, no apparent heavy metal accumulation from the power plant or railway occurred in farmland soils. Besides, heavy metals mainly exist in stable forms within soils which suggests a lower potential health risk. Also, as an agricultural source, the application and amount of chemical fertilizer may affect the spatial variability of heavy metals in soils.

• Key words：peri-urban area  IDW interpolation  total contents  chemical fractions  source analysis

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