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对煤炭矿区地球化学垒进行研究是了解矿区土壤元素迁移、富集及污染状况的重要途径。以大柳塔矿区周围耕地土壤为研究对象,在采集52个耕地样点的基础上,对样品重金属含量、富集状况进行了分析,并运用不同的标准对污染状况进行了评价。结果显示经过20多年的煤炭开采,对大柳塔矿区耕地土壤中重金属富集和污染有显著贡献,矿区耕地表层土壤重金属明显积累,除Zn外,重金属元素表层含量明显高于下层11%~52%,形成明显的人为地球化学垒,表层各重金属的富集系数EF在1.7~3.3之间,富集不是十分强烈,重金属含量虽然高出土壤环境背景值,但明显低于国家土壤环境质量二级标准,土壤尚属清洁。矿区土壤因矿业活动造成的重金属污染是一个缓慢的过程,部分重金属元素的积累量已经接近轻度污染,应引起高度重视。
It is an important way to understand the migration, enrichment and pollution status of soil elements in mining area. Taking arable land around Daliuta mining area as the research object, on the basis of collecting 52 cultivated land samples, the heavy metal content and enrichment status were analyzed, and the pollution status was evaluated by different standards. The results showed that after more than 20 years of coal mining, significant contribution was made to the accumulation and pollution of heavy metals in cultivated soils in the Daliuta mining area. Heavy metals in the topsoil of the mined area significantly increased except for Zn, while the contents of heavy metal elements were significantly higher than those in the lower 11% -52% , The formation of obvious artificial geochemical barriers, the enrichment coefficient EF of the surface heavy metals in the 1.7 to 3.3, the enrichment is not very strong, although the content of heavy metals above the background value of soil environment, but significantly lower than the national soil environmental quality two Standard, soil is still clean. Heavy metal pollution in mining area due to mining activities is a slow process. The accumulation of some heavy metal elements has been approaching to mild pollution, which deserves great attention.