【摘要】 讨论了108个取自漳州市城区公园、生活区及环城菜地等不同功能区的表层(0～20cm)土壤样品中重金属含量及分布特点,根据土壤中重金属元素与主元素间的相关分析、聚类分析,探讨了影响土壤中重金属分布和来源的因素。结果表明,漳州市城市土壤Hg、Cd、Pb、Cu、Zn、As、Cr和Ni的平均含量分别为0.471mg/kg、0.353mg/kg、75.9mg/kg、32.6mg/kg、106.7mg/kg、6.86mg/kg、29.7mg/kg和12.8mg/kg,其中相对于区域土壤背景值与国家土壤环境质量标准,污染较突出的元素是Hg和Cd。深受人为污染活动影响的城区土壤和菜地土壤重金属平均含量也尤为突出,城区土壤Hg平均含量最高,菜地土壤Cd平均含量最高。元素的相关性分析和聚类分析结果表明Hg相对于其他元素表现较独立,S对Hg有一定的捕获能力;As、Cr和Ni是受控于成土母质的元素组合;Cd和Pb是受人为污染影响较强的元素,Cu来源于地质成因的比例较大;Zn受控于土壤中锰氧化物粘粒。更多还原

【Abstract】 Human health in towns and cities is strongly dependent on the sta tu s of urban soils. Urban soils may be affected by industrial activities, traffic, agricultural practices, and waste disposal. Interest in trace elements in urban environments has rapidly increased as a consequence of the high levels of conta mination measured in some cities, and the associated potential health risks. Con centrations of Hg, Cd, Pb, Cu, Zn, As, Cr and Ni were measured in 108 topsoil sa mples collected from parks, residential areas and suburban agricultural soils in the city of Zhangzhou, Fujian Province, China in order to assess the distributi on of these heavy metals in the urban environment and identify possible sources of pollution, and other heavy element contents of the topsoils were determined t o find out the controlling factors of heavy metal contents and their distributio n. Mean contents of Hg, Cd, Pb, Cu, Zn, As, Cr and Ni in topsoils in Zhangzhou C ity are 0.471, 0.353, 75.9, 32.6, 106.7, 6.86, 29.7 and 12.8 mg/kg, respectively . Compared to the background values for soils in Fujian Province, Hg and Cd are the strongest enriched elements; Pb and Cu are moderately enriched elements; Zn and As are close to the background values; while Cr and Ni are lower than the ba ckground ones. Compared to soil environmental quality standards of China, Hg and Cd are the most seriously polluted elements in Zhangzhou City. And among the in vestigated soils, urban soils have the highest content of Hg, and vegetable soil s have the highest content of Cd. Heavy metal contents in urban soils and vegeta ble soils reflect human impacts on soils. Statistic approaches (correlation matr ix and cluster analysis) were adopted for identification of natural and anthropi c influence on heavy metal contents. The results demonstrate that the distributi on of Hg does not appear to be associated with any other elements, while S may b e capturer for Hg; As, Cr and Ni are elements controlled by pedogenesis; Cd and Pb are elements disturbed by anthropic contributions; Cu is mainly controlled by pedogensis and Zn is closely association with Mn oxides in soils.更多还原