淮河上游全新世黄土-土壤剖面重金属元素分布与环境变化

在野外考察研究的基础上利用X-射线荧光光谱仪测定了河南禹州全新世YPC黄土-土壤剖面Zn、Cu、Co、Ni、Nb、Pb、V、Cr、Mn、Ti重金属元素的含量及其变化,研究表明在黄土堆积期,重金属元素的含量都很低,变化幅度也很小,可作为衡量古土壤层成壤改造的背景值.在全新世古土壤和现代表土中这些元素含量却大大增加,说明在温暖湿润的时期,成壤改造使易溶易迁移元素的淋失导致重金属元素的相对富集.而Pb含量从8cm深度处向上急剧增加,增幅达60%,这是大气污染物沉降积累的客观记录.

Dynamics of Heavy Metals in the Holocene Aeolian Loess-Soil Profile in the Upper-Reaches of the Huaihe River

Upon the exploration and research in the field,we determined the content of Pb,Zn,Cu,Mn,Cr,Co,Ni,Ti,V,Nb at YPC loess-soil site on the X-ray Fluorescence.In the stage of loess accumulation,the content of these heavy metals are very low and the variances are very little,which can be served as the background value of paleosol formation.In the stage of Holocene Megathermal,the content of these heavy metals are increased greatly,because the eluviations and transmigrations of freely soluble elements under warm and humidity environment.In the stage of modern soil(MS),the content of Pb are increased gradually,and there are abruptly increase in the depth of 8cm below the ground,which are the records of sedimentation and accumulation of atmospheric pollutant.