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采集不同年代被覆盖,且性质可比的土壤为载体,运用空间转换时间法,重建长三角宜兴市1950～2006年期间土壤重金属含量,并分析社会经济发展对重金属积累的影响。结果表明:(1)Cu、Ni、Pb、Zn4元素含量和土壤重金属累积水平呈先降后升的变化趋势;As元素含量整体呈下降趋势,Cd元素含量呈明显累积;Co和Cr元素含量则稳定波动。(2)各指标与重金属含量和累积水平有较高的关联度,且排序稳定。重金属含量的主要经济影响因素为总人口、农村化肥施用量和总播种面积,而与总货运量、农村工业产值和总产值的关联度较小;对重金属累积水平的影响,农村化肥施用量、总人口和粮食总产量最为重要。
In this paper, the soil covered in different ages and of comparable quality was collected as the carrier. The spatial transformation time method was used to reconstruct the soil heavy metal contents of Yixing City from 1950 to 2006 in the Yangtze River Delta. The effects of socio-economic development on heavy metal accumulation were also analyzed. The results showed that: (1) Cu, Ni, Pb and Zn4 content and soil heavy metal accumulation level showed the trend of decreasing first and then increasing; the content of As element decreased as a whole and the content of Cd element obviously increased; Stable fluctuations. (2) Each indicator has a high correlation with heavy metal content and accumulation level, and the ranking is stable. The main economic influencing factors of heavy metal content are the total population, the amount of chemical fertilizer in rural areas and the total sown area, but less related to the total freight volume, rural industrial output value and total output value; the impact on heavy metal accumulation level, The total population and the total grain output are the most important.