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首页> 外文期刊>Environmental Science and Pollution Research >County-scale temporal-spatial distribution and variability tendency of heavy metals in arable soils influenced by policy adjustment during the last decade: a case study of Changxing, China
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County-scale temporal-spatial distribution and variability tendency of heavy metals in arable soils influenced by policy adjustment during the last decade: a case study of Changxing, China

机译：近十年来政策调整对县域耕地土壤重金属时空分布及变异趋势的影响-以长兴市为例

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摘要

The widespread "pertinacious illness" for environmental management soil contamination by toxic metals has inevitably led to announcement of gradual adjustment for the local government to curb the notorious pollution. An extensive survey was conducted in Changxing County, Zhejiang Province, to investigate the contents of cadmium (Cd), arsenic (As), lead (Pb), and copper (Cu) and characterize the spatial-temporal change pattern to elucidate the current state and performance of policy adjustment. Geostatistic methods were applied in the mapping and characterizing processes to assess the concentrations of heavy metals at unsampled sites. Enrichment factor analysis indicated obvious Cd and As enrichment in the west and northwest of the county. Ordinary kriging interpolation combined with semivariogram revealed that the four heavy metals possessed distinct spatial distribution patterns. However, the distribution patterns for the elevated Cd and Pb concentrations exhibited a similar geographic drift, corresponding primarily to industrial distribution. Compared with the investigation findings in 2003, the results indicated an uptrend of Cd and As and downtrend of Cu, while Pb was a mixture of increase and decrease. However, strengthened actions aimed at restraining heavy metal contamination are still needed to establish a mechanism to secure residents' health and livelihood.
机译：环境管理中有毒金属污染土壤的广泛性“顽疾”不可避免地导致宣布逐步调整地方政府以遏制臭名昭著的污染。在浙江省长兴县进行了广泛的调查，以调查镉（Cd），砷（As），铅（Pb）和铜（Cu）的含量，并描述时空变化模式以阐明当前状态。以及政策调整的效果。地统计学方法用于制图和特征描述过程中，以评估未采样地点的重金属浓度。富集因子分析表明，该县西部和西北部的Cd和As富集明显。普通克里金插值结合半变异函数显示，四种重金属具有明显的空间分布模式。但是，Cd和Pb浓度升高的分布模式表现出相似的地理漂移，主要对应于工业分布。与2003年的调查结果相比，结果表明Cd和As的上升趋势和Cu的下降趋势，而Pb是上升和下降的混合物。但是，仍然需要采取加强抑制重金属污染的行动，以建立确保居民健康和生计的机制。

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