秀山-酉阳地区土壤环境地球化学特征

Pedogeochemistry in the Xiushan-Youyang Region

基于重庆秀山县、酉阳县土壤地球化学调查数据,对深、表层土壤中As、Cd、Cu、Cr、Hg、Ni、Pb、Zn等8个重金属元素的分布特征,土壤的酸碱度、母岩对土壤地球化学特征的影响等进行了分析。结果表明,不同类型土壤中各元素富集特征不同;表、深层土壤均以酸性为主,土壤酸碱度影响重金属的空间富集与贫化特征,适当提高土壤pH值使其呈弱酸性或弱碱性是降低重金属污染的一项有效措施。通过分析,将研究区土壤环境背景分为三类,其中,重金属元素高背景区空间分布的非自然源特征明显,主要为人类活动形成的点状或面状异常,是该区生态环境面临的主要问题。

This paper has a discussion on distribution of heavy metallic elements such as As, Cd, Cu, Cr, Hg, Ni, Pb and Zn in surface and deep soil, soil pH value and effect of parent rock on soil geochemistry in Xiushan and Youyang, Chongqing based on pedogeochemical survey. The study shows that element enrichment is different in different soil types. Heavy metal content in soil is controlled by pH value. pH values for the surface and deep soils in the studied area are less than 7. Heavy metallic element content backgrounds in soil of this region may be divided into 3 types. High heavy metal element content background is characterized by point or facial anomalies due to human activities which is main ecological environment problem in this region.