| 关中娄土剖面中重金属元素的垂直分布规律研究 |
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| 关键词:Guanzhong tier soil profile heavy metal elements regularity of vertical distribution |
| 基金项目:中国科学院地球环境科学研究所黄土与第四纪地质国家重点实验室开放基金项目(编号:SKLLQG0704); 国家科技部软科学研究项目(编号:2004DGS3D026); 陕西省科技发展计划重大项目(编号:2003K12-G5) |
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| 摘要: |
| The Vertical Distribution Regularity of Heavy Metal Elements in Guanzhong Tier Soil Profile |
| Based on a study of monitored soil samples collected from Xi'an sewage irrigated area,Baoji gorge irrigated area and Jiaokou irrigated area in Guanzhong plain,the authors investigated vertical distribution and leaching migration of such heavy metals as Cd,As,Cr and Pb in the Guanzhong tier soil profile.These elements can seriously endanger soil environment and human health.The following conclusions have been reached:Cd,Pb,As and Cr tend to be concentrated in the cultivated horizon under the condition of long-term sewage irrigation,the Cd and Pb content tends to decrease from the cultivated horizon to its underlying layer,whereas the As and Cr content fails to show such a decreasing tendency.The Cd,Pb,As,Cr content tends to increase in the soil layer of 80～100 cm,which might be the inflection layer in the vertical distribution of heavy metals.The water washing coefficients of heavy metals are characterized by Cd>Cr>As>Pb,and the water washing coefficients of heavy metals have an increasing tendency from the cultivated horizon through plow pan,old plow layer and ancient plow layer to viscid layer.Where the content of heavy metals is high in soil layer of the sewage irrigation area,Cd,Cr,As and Pb can eluviate and migrate towards the underlying aeration zone,thus threatening the security of underground water. |
| ZHENG Guo-zhang.2008.The Vertical Distribution Regularity of Heavy Metal Elements in Guanzhong Tier Soil Profile[J].Acta Geoscientica Sinica,29(1):109-115. |
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