Study on selenium-rich soil distribution and heavy metal environmental capacity of agricultural land in Yuanzhou district of Yichun city,Jiangxi province
Yuanzhou district of Yichan city in Jiangxi province has abundant soil selenium resources,but due to the rapid advancement of urbanization and industrialization,the types and quantities of soil heavy metals have increased,and the existence of the associated relationship between soil selenium and heavy metals makes the selenium-rich soils threatened by certain heavy metals,which restricts the development and utilization of selenium-rich agricultural products.In this study,the contents of eight heavy metals,namely lead(Pb),chromium(Cr),cadmium(Cd),arsenic(As),mercury(Hg),copper(Cu),zinc(Zn)and nickel(Ni),were collected and detected in 162 surface soil samples in Yuanzhou district,and the environmental capacity level and spatial distribution of selenium-rich soil in agricultural land in Yuanzhou district were analyzed by estimating the environmental capacity of soil heavy metals and using the environmental capacity index method and spatial interpolation method,and the heavy metal pollution status of selenium-rich soil in agricultural land in Yuanzhou district was analyzed.The results showed that:(1)The entire agricultural land in Yuanzhou district could be divided into three kinds of soils:selenium-rich,potentially selenium-rich and selenium-sufficient,accounting for 74.04%,16.00%and 9.96%of the agricultural land in Yuanzhou district,respectively.(2)The average static annual capacity and average dynamic annual capacity of Pb,Cr,As,Hg,Cu,Zn and Ni in 8 years were sorted the same,in order of Zn＞Cr＞Pb＞Ni＞As＞Cu＞Hg,the average static and dynamic annual capacity of these seven heavy metals decreased with the increase of the control period,and the average dynamic annual capacity of the seven heavy metals was larger than the average static annual capacity.(3)The seven heavy metals of Pb,Cr,As,Hg,Cu,Zn and Ni in selenium-rich soil in the study area were mainly in the medium capacity area,while Cd was mainly in the overload area.On the whole,more than 85%of the study area was belonged to low capacity area,and the overall capacity was low,and the soil was moderately polluted.In order to improve the environmental capacity of soil heavy metals in the study area,reduce the degree of pollution,and ensure the safety of selenium-rich agricultural products,different measures of soil pollution prevention and control and restoration could be taken for different capacity areas.
selenium richheavy metalsenvironmental capacitysoil remediationYuanzhou district
NETL
NSTL
万方数据
