Analysis of soil heavy metal influencing factors and sources in typical small watersheds in shallow mountainous area
This study investigated the contents of eight heavy metals and related oxides in rocks with different lithologies and the soils formed in the Puhe river basin of Pingquan City.Based on the above investigation,this study analyzed the influencing factors and sources of soil heavy metals in the typical small watershed of the shallow mountainous area,aiming to provide theoretical support for wa-ter conservation and ecological restoration in the Beijing-Tianjin-Hebei region.Based on the contents and spatial distributions of soil heavy metals and combined with regional geological setting,this study delved into the influencing factors and sources of heavy metal el-ements in topsoil,deep soil,and soil parent materials using multiple statistical methods.The results show that heavy metals in topsoil and deep soil exhibited relatively similar contents and coupled spatial distributions.In terms of vertical distributions,the correlation co-efficients of heavy metals were negative between topsoil and soil parent materials but positive between deep soil and soil parent materi-als.As indicated by the results,in the topsoil,elements Cr,Ni,Cu,Zn,and Pb are primarily derived from soil parent materials,while elements Cd,Hg,and As are subjected to the influence of mining.In contrast,the eight heavy metals in the deep soil predomi-nantly stem from soil parent materials,with anthropogenic factors contributing to Cd and As.
small watershed in the shallow mountainous areasoil heavy metalinfluencing factorminingsource
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