Temporal-spatial distribution and variability of cadmium contamination in soils in Shenyang Zhangshi irrigation area, China
查看参考文献23篇
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文摘
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Heavy metal contamination in soils has been of wide concern in China in the last several decades. The heavy metal contamination was caused by sewage irrigation, mining and inappropriate utilization of various agrochemicals and pesticides and so on. The Shenyang Zhangshi irrigation area (SZIA) in China is a representative area of heavy metal contamination of soils resulting from sewage irrigation for about 30 years duration. This study investigated the spatial distribution and temporal variation of soil cadmium contamination in the SZIA. The soil samples were collected from the SZIA in 1990 and 2004; Cd of soils was analyzed and then the spatial distribution and temporal variation of Cd in soils was modelled using kriging methods. The kriging map showed that long-term sewage irrigation had caused serious Cd contamination in topsoil and subsoil. In 2004, the Cd mean concentrations were 1.698 and 0.741 mg/kg, and the maxima 10.150 and 7.567 mg/kg in topsoils (0-20 cm) and subsoils (20-40 cm) respectively. These values are markedly more than the Cd levels in the second grade soil standard (LSGSS) in China (GB15618-1995). In 1990, the Cd means were 1.023 and 0.331 mg/kg, and the maxima 9.400 and 3.156 mg/kg, in topsoils and subsoils respectively. The soil area in 1990 with Cd more than 1.5 mg/kg was 2701 and 206.4 hm2 in topsoils and subsoils respectively; and in 2004, 7592 and 1583 hm~2. Compared with soils Cd levels in 1990, the mean and the maximum concentration of Cd, as well as the soil area with Cd more than 1.5 Mg/kg had all increased in 2004, whether in topsoils or in subsoils. |
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来源
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Journal of Environmental Sciences
,2006,18(6):1241-1246 【核心库】
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DOI
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10.1016/s1001-0742(06)60069-7
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关键词
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temporal-spatial distribution
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cadmium contamination of soil
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Zhangshi sewage irrigation area (ZSIA)
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Shenyang
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地址
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1.
Shenyang University, Shenyang Key Laboratory of Environmental Engineering, Shenyang, 110044
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Liaoning Research Institute of Geology and Mineral Resources, Shenyang, 110032
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Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1001-0742 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金
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国家973计划
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辽宁省教育厅基础研究项目
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文献收藏号
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CSCD:2460385
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