| 西湖景区土壤典型重金属污染物的来源及空间分布特征 |
| 摘要点击 4056 全文点击 1541 投稿时间：2013-08-11 修订日期：2013-10-23 |
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| 中文关键词 城市土壤 重金属污染 交通排放 城市生态风险 空间分布 |
| 英文关键词 urban soil heavy metal pollution traffic emission urban ecological risk spatial distribution |
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| 中文摘要 |
| 西湖景区由于其特殊的社会价值和地理位置，其土壤重金属污染问题备受关注.本研究通过对景区网格布点采样，采用数学统计学和Arcgis手段进行西湖风景区土壤重金属污染物的来源及空间分布特征分析.结果表明，景区土壤重金属Cu、Zn、Pb有明显人为累积，为景区的主要重金属污染物，浓度范围分别是4.6~197、11.1~885、11.7~346 mg·kg-1.Cu、Pb、Zn含量最高25%的区域都在景区东北部西湖周围绿地面积比例较小、交通道路密度大、城市化程度较高的区域；不同土地利用类型之间这3种重金属污染物含量的多重比较及空间聚类与离散分析的结果表明，交通排放是这3种重金属污染物的主要来源.本研究的结果为城市交通排放重金属污染土壤生态风险评价及城市环境管理提供了基础数据与理论依据. |
| 英文摘要 |
| Due to the importance as a famous scenic area in China and its special geographical position, heavy metal pollution in soils in Xihu Scenic Area has attracted great concerns. Typical heavy metals in surface soils (0-20 cm) in Xihu Scenic Area was investigated using the grid sampling method and statistical analysis and Arcgis approaches. It was suggested that there were anthropogenic accumulations of Cu, Zn and Pb in soils, and they were the main heavy metal pollutants in Xihu Scenic Area. The contents of Cu, Zn, Pb in soils are in the ranges of 4.6-197 mg·kg-1, 11.1-885 mg·kg-1 and 11.7-346 mg·kg-1, respectively. The area with the highest 25% of Cu, Pb and Zn content located in the north-east part of the scenic area, which had lower ratios of green land, dense traffic roads and was characterized with high urbanization. Results of multiple comparison among different land uses and spatial cluster and outlier analysis revealed that those three main heavy metal pollutants Cu, Pb and Zn in Xihu Scenic Area were from traffic emissions. The purpose of this study was to provide basic data and theoretical bases for the ecological risk assessment of heavy metals in urban soils and environmental management of urban soils. |
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