土壤重金属铅的空间变异性研究——以重庆市吴滩镇为例

Spatial variability of soil Pb—A case study from Wutan Town, Chongqing City

  • 摘要: 采用地统计学方法研究重庆吴滩镇土壤中重金属Pb的空间变异特性结果表明,该区土壤重金属Pb具有显著空间结构性特点,小尺度明显受施肥、作物和管理水平等人为因素的影响,且空间分布无明显变化规律;而中尺度具有一定渐变性分布规律。受耕作管理措施和酸性有水环境因素影响,水稻土中Pb含量明显高于紫色土。该区土壤中Pb含量低于国家1级标准的占29.79%,低于国家2级标准的占70.21%,其中属轻度污染的占49.16%,中度污染的占21.05%。

     

    Abstract: The spatial variability characteristics of Pb in soil at Wutan Town in Chongqing were studied using geostatistics method. The results show that the Pb has a good spatial structures. The spational distribution of Pb in a small region is not obviously varied, which is correlated with fertilization, crop, the level of management and so on. But the spatial distribution of Pb has gradually changed in the secondary region. The Pb concentration in paddy field is obviously higher than that in dry land because of the technique of management and water condition. The content of Pb which is lower than the national arterial criterion accounts for 29.79%, and which is lower than the national secondary criterion accounts for 70.21% in the whole region. The light pollution area accounts for 49.16%, and the medium pollution area accounts for 21.05% in the whole studied region.

     

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