Ruiz-Cortés E, Reinoso R, Díaz-Barrientos E, Madrid L
Instituto de Recursos Naturales y Agrobiología de Sevilla (CSIC), Apartado 1052, 41080 Sevilla, Spain.
Environ Geochem Health. 2005 Sep;27(5-6):465-74. doi: 10.1007/s10653-005-4222-1.
Fifty-two samples of surface soils were taken in the urban area of Seville, to assess the possible influence of different land uses on their metal contents and their relationship with several soil properties. The samples corresponded to five categories or land uses: agricultural, parks, ornamental gardens, riverbanks, and roadsides. Sequential extraction of metal according to the procedure proposed by the former Community Bureau of Reference (BCR) was carried out, and pseudo-total (aqua regia soluble) metal contents were determined. Lower organic C, total N and available P and K contents were found in riverbank samples, probably due to the lack of manuring of those sites, left in a natural status. In contrast, significantly higher electrical conductivity was found in those sites, due to the tidal influence of the nearby Atlantic Ocean. Other land uses did not show significant differences in the general properties. Concentrations of Cu, Pb and Zn, both aqua-regia soluble and sequentially extracted, were clearly higher in soils from ornamental gardens, whereas the concentrations in the riverbank samples were slightly lower than the other categories. In contrast, other metals (Cd, Cr, Fe, Mn, Ni) were uniformly distributed throughout all land uses. A strong statistical association is found among the concentrations of Cu, Pb, Zn and organic C, suggesting that the larger contents of these metals in ornamental gardens are partly due to organic amendments added to those sites more frequently than to other kinds of sites. Considering the conclusions of previous studies, heavy traffic can also contribute to those ;urban' metals in urban soils. Periodic monitoring of the concentrations of urban metals in busy city centres and of the quality of amendments added to soils of recreational areas are recommended.
在塞维利亚市区采集了52份表层土壤样本，以评估不同土地利用方式对其金属含量的可能影响以及它们与几种土壤性质的关系。这些样本对应于五类土地利用方式：农业用地、公园、观赏花园、河岸和路边。按照前共同体参考局（BCR）提出的程序对金属进行连续提取，并测定了伪总量（王水可溶）金属含量。河岸样本中的有机碳、总氮以及有效磷和钾含量较低，这可能是由于这些地点处于自然状态，缺乏施肥。相比之下，由于附近大西洋的潮汐影响，这些地点的电导率明显较高。其他土地利用方式在一般性质上没有显著差异。观赏花园土壤中王水可溶态和连续提取态的铜、铅和锌浓度明显较高，而河岸样本中的浓度略低于其他类别。相比之下，其他金属（镉、铬、铁、锰、镍）在所有土地利用方式中分布均匀。铜、铅、锌浓度与有机碳之间存在很强的统计关联，这表明观赏花园中这些金属含量较高部分是由于这些地点比其他类型的地点更频繁地添加有机改良剂。考虑到先前研究的结论，繁忙交通也可能导致城市土壤中出现这些“城市”金属。建议定期监测繁忙市中心城市金属的浓度以及休闲区土壤添加改良剂的质量。
