我国平原区土壤地球化学异常成因研究

我国平原地区土壤地球化学异常普遍存在,但是目前对这些异常的成因缺乏系统认识。这里以长春和南京地区的Hg、Cd异常试验研究结果为例,利用元素相关关系法,对此进行了系统研究。结果表明,城镇及其周边地区的土壤地球化学异常,异常组分叠加量表现出表层累积型特点,此类异常的成因与人类活动有关。分布在河流沿岸的土壤地球化学异常,在垂向上,异常组分叠加量表现出了连续型分布特点,且异常组分含量主要受土壤物质组成的控制,此类异常是在河流沉积物自然沉积过程中形成的。

The origin of soil geochemical anomalies in plain areas in China

The soil geochemical anomalies are ubiquitous in plain areas in China. The origin of them is, However, still unclear now. Based on results of Hg and Cd anomalies in Changchun and Nanjing, the paper focuses on the origin of soil geochemical anomalies using the elemental correlation method. The results show that the accumulation of the anomalous components in soil geochemical anomalies around urban areas are of the features of surface layer accumulative type, and the origin of this type anomaly is relate to human activity. The accumulation of the anomalous components in soil geochemical anomalies along banks of river is of the integrated characters at soil sections and the content of anomalous components, and mainly is controlled by the mechanical composition or grain size of soils, and this type geochemical anomaly is formed in nature geological processes.