临汾盆地农田褐土剖面重金属的分布迁移特征  

Distribution and Migration Characteristics of Heavy Metal Elements in Profile of Cinnamon Soil in Farmland of Linfen Basin

作　　者：李向宏[1] 王艳红 郑国璋[1,3] 

机构地区：[1]山西师范大学地理科学学院,山西临汾041004 [2]临汾市经济技术开发区第一中学,山西临汾041000 [3]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,陕西西安710075

出　　处：《河北师范大学学报（自然科学版）》2016年第2期168-171,共4页Journal of Hebei Normal University：Natural Science

基　　金：山西师范大学科技开发与应用基金(ZK1402);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(SKLLQG1023);山西省软科学研究计划项目(2008041032-03)

摘　　要：通过对临汾盆地农田褐土剖面土壤样品的采集和测试,系统分析重金属Cd,Pb,Cr在土壤剖面中的垂直分布和淋滤迁移特征.结果表明:在长期灌溉耕作的条件下,Cd,Pb在耕作层富积不明显,具有从耕作层向土壤下层递增的趋势;Cr在耕作层富积明显,具有从耕作层向土壤下层递减的趋势;Cr的垂直分布特征与土壤有机质含量呈极显著正相关,Cd,Pb,Cr的垂直分布特征与土壤粒度呈显著正相关.褐土剖面重金属的淋失率具有Cd>Pb>Cr的特征,Cd对地下水安全威胁最大;Pb,Cr在土壤表层含量较高时,均可向土壤下层淋滤迁移威胁地下水安全.Based on the measurements of soil samples collected from Linfen Basin,vertical distribution and leaching migration of Cd,Pb and Cr in profile of cinnamon soil in farmland are investigated.The results indicate that Cd and Pb enrichment in cultivated layer is not obvious under the condition of long-term irrigation farming,and Cd and Pb contents tend to increase from cultivated layer to lower layer.The element Cr tends to be concentrated in cultivated layer,and Cr content tends to decrease from cultivated layer to lower layer.Vertical distribution characteristics of Cr are significantly positively correlated to soil organic matter content,while vertical distribution characteristics of Cd,Pb and Cr are significantly positively correlated to soil particle size.The water washing coefficient of heavy metals is characterized by Cd〉Pb〉Cr.The water washing coefficient of Cd is the highest,which threatens groundwater environmental security seriously.When the contents of heavy metals Pb and Cr are high in the surface soil,they can eluviate and migrate towards the underlying layer,thus threatening groundwater safety.

关 键 词：褐土剖面 重金属 分布迁移 临汾盆地 

分 类 号：S19[农业科学—农业基础科学]