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地球学报  2008 

关中娄土剖面中重金属元素的垂直分布规律研究

DOI: 10.3975/cagsb.2008.01.14

Keywords: 关中娄土剖面,重金属元素,垂直分布规律

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Abstract:

通过对关中平原西安污灌区、宝鸡峡灌区、交口灌区关中娄土剖面土壤样品的采集、监测,重点分析了对土壤环境及人体危害较大的Cd、Pb、As、Cr等重金属元素在土壤剖面中的垂直分布和淋失迁移的特征.结果表明:在长期污灌的条件下,关中娄土剖面中的Cd、Pb、As、Cr含量具有在土壤耕作层富集的特征,关中娄土剖面中的Cd、Pb含量具有从耕作层向土壤下层递减的趋势,As、Cr含量从耕作层向土壤下层递减的趋势不明显.关中娄土剖面中的Cd、Pb、As、Cr含量在80~100cm土壤粘化层中均具有明显增高的趋势,为土壤剖面中重金属元素垂直分布的转折层.关中娄土剖面中重金属元素的淋失率具有CA>Cr>As>Pb的特征,且土壤剖面中重金属的淋失率具有从耕作层、犁底层、老耕层、古耕层、粘化层垂直递增的趋势.当污灌区土层中的重金属含量高时,土壤剖面中的重金属元素Cd、Cr、As、Pb均可向土壤下包气带土层淋虑迁移,对地下水的安全构成威胁.

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