Spatial Distribution Characteristic and Assessment of Total and Available Heavy Metals in Karst Peri-Urban Vegetable Soil

International Conference on Manufacturing Technology, Materials and Chemical Engineering

机械制造;材料科学;化学工业

Xuan, Bin^1 ; Lu, Xiaohui^1 ; Wang, Ji^1 ; Cai, Xiongfei^1 ; Duan, Zhibin^1 ; Hu, Fenqing^1 ; Wang, Kun^1,2 ; Li, Ding^1

School of Geographic and Environmental Science, Guizhou Normal University, Guiyang, Guizhou

550025, China^1

Key Lab. of Remote Sensing Application on Mountain Resources and Environment in Guizhou Province, Guiyang, Guizhou

550025, China^2

关键词: Background value;    Distribution characteristics;    Ecological risk assessment;    Heavy metal concentration;    Potential ecological hazards;    Potential ecological risk;    Southwest China;    Spatial variability;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/392/4/042022/pdf
DOI  :  10.1088/1757-899X/392/4/042022

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The purpose of this study was to investigate the total and available concentration of Cu, Zn, Pb and Cd in the vegetable soil from typical Karst peri-urban and to analysis the spatial distribution characteristic of heavy metal and to assess their potential ecological risk in Guiyang city, southwest China. The mean value of Cu, Zn, Pb and Cd was higher than their background values of Guizhou topsoil and show a certain accumulation phenomenon. Furthermore, the concentration of available Cu, Zn, Pb and Cd were shown moderate spatial variability and had a complex pollution tendency. Based on semivariance function and Kriging's geostatistics, the total and available Cu, Zn, Pb and Cd were essentially showing the pattern of patch-like distribution and high of heavy metal concentration are mainly distributed in southwest of this area. The potential ecological hazard trend is Cd>Pb>Cu>Zn from the average values of the total and availability of heavy metals. According to the current ecological risk assessment, vegetable soil in the peri-urban of the karst area is subjected to the ecological harm of the Cd and should be paid enough attention.