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首页> 外文期刊>International Journal of Environmental Research and Public Health >Spatial Assessment of Anthropogenic Impact on Trace Metal Accumulation in Farmland Soils from a Rapid Industrializing Region, East China
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Spatial Assessment of Anthropogenic Impact on Trace Metal Accumulation in Farmland Soils from a Rapid Industrializing Region, East China

机译：人为因素对华东快速工业化地区农田土壤中微量金属积累的影响的空间评估

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A better understanding of anthropogenic trace metal accumulation in farmland soils is crucial for local food safety and public health, especially for a rapidly industrializing region. In this study, soil samples at two depths were collected from a typical county in East China and analyzed for total concentrations of Fe, Al, Pb, Cd, Cu, Zn, Cr, and Ni. Results showed that trace metals like Pb, Cd, Cu, Zn, Cr, and Ni have accumulated in the regional farmlands, with average topsoil concentrations 1.62–1.77 times higher than their background concentrations in subsoil. However, they were still much lower than the limits of the Chinese Environmental Quality Standard for Soils. By the proper calculation of enrichment factor (EF), it was found that the accumulations of trace metals in the topsoil have been impacted by anthropogenic activities, which could contribute up to 40.83% of total metal concentration. Two principal components were extracted according to the results of principal component analysis (PCA) for EF values, which indicated two important anthropogenic trace metal sources. With the help of spatial distribution maps based on geographical information system (GIS), the anthropogenic sources of Pb, Cr, and Ni were determined to be mostly associated with atmospheric deposition from the central urban area. However, Cd, Cu, and Zn were further confirmed to originate from different agricultural sources. The anthropogenic Cu and Zn inputs were mostly related to pig manure application in the rural northern and southeastern areas, while extensive fertilizer application was identified as the major contributor to anthropogenic Cd accumulation in this region. Overall, the integrated application of EF, PCA, and GIS mapping is an effective approach to achieve the spatial assessment of anthropogenic impact on trace metal accumulation in regional soils.
机译：更好地了解农田土壤中人为微量金属的积累对于当地食品安全和公共卫生，特别是对于快速工业化地区至关重要。在这项研究中，从中国东部一个典型县收集了两个深度的土壤样品，并分析了其中的铁，铝，铅，镉，铜，锌，铬和镍的总浓度。结果表明，痕量金属（如Pb，Cd，Cu，Zn，Cr和Ni）已积累在区域农田中，平均表层土壤浓度是其本底土壤浓度的1.62-1.77倍。但是，它们仍远低于中国土壤环境质量标准的限值。通过对富集因子（EF）的正确计算，发现表土中痕量金属的积累受到人为活动的影响，这可能占总金属浓度的40.83％。根据主成分分析（PCA）的EF值提取了两个主成分，这表明两个重要的人为痕量金属来源。借助基于地理信息系统（GIS）的空间分布图，人们确定了Pb，Cr和Ni的人为来源主要与市区中心的大气沉积有关。但是，进一步证实了Cd，Cu和Zn来自不同的农业来源。在北部和东南部农村地区，人为产生的铜和锌的投入主要与猪粪的施用有关，而广泛的肥料施用被认为是该地区人为导致镉积累的主要因素。总体而言，EF，PCA和GIS映射的综合应用是实现人为对区域土壤中痕量金属积累的影响的空间评估的有效方法。

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