关中东部全新世剖面土壤重金属元素分布特征与环境演变

摘要

Based on the Holocene loess-soil profile in eastern Guanzhong , we analyzed the content and distribution of Ni, Mn , Cu , Zn , Nb , As , Ti, V , Co and Pb at TSG site and compared with magnetic susceptibility and Rb /Sr . The results showed that the changes of Ni , Cu , As , V , Mn , Zn and Nb were affected by climate change and its pedogenesis environment, Co was contacted closely with soil parent materials , and the sensitivity of Pb into its pedogenesis environment was poor . In the stage of paleosol period in eastern Guanzhong , the content of soil heavy metals was increased sig- nificantly, the warm and humid climate during this period , strong pedogenesis making some soluble elements migration and leaching, leading to relative enrichment of heavy metals in the paleosol .%以关中东部全新世黄土-古土壤剖面为研究对象,分析了Ni、Mn、Cu、Zn、Nb、As、Ti、V、Co和Pb十种土壤重金属元素的含量及其分布特征,并与磁化率、Rb/Sr曲线进行了比对和相关性分析,研究结果表明:Ni、Cu、As、V、Mn、Zn和Nb重金属元素的动态变化与全新世以来成壤环境的变化趋势是一致的,暗示全新世土壤重金属元素受到气候变化、成壤环境的强烈影响;Co元素主要受到成土母质的影响;Pb对成壤环境的敏感性较差.关中东部地区古土壤S0发育时期,土壤重金属元素含量明显增加,这一时期气候温暖湿润,强烈的成壤作用使得易溶性元素发生向下的迁移淋失,导致重金属元素在古土壤层中相对富集.