Characteristics of heavy metal pollution in soil and wheat of agricultural land around gangue hills of closed pit coal mine
Taking the farmland around the gangue mountain of a closed pit coal mine of Wanbei Coal-electricity as the research object,the soil and corresponding wheat samples within 300 m of the four directions of the gangue mountain were collected to analyse the heavy metal content of the soil,the spatial distribution characteristics,and the heavy metal content changes in different organs of the wheat and its migration characteristics,and the migration and transformation regression model of the heavy metals in the root system-stem-seed was established according to the metal content of the wheat.The results of the study showed that the average values of heavy metal contents of Cd,Hg,As,Cr,Ni,Cu and Zn in the soil were lower than the national soil secondary standards,and the heavy metal contents of the soil in the agricultural land around the gangue mountain showed a decreasing trend with the increase of migration distance.Among the various organs of wheat,the highest content of Zn was found in the seeds,and the highest content of Hg was found in the stem diameter.As,Pb,Cr,and Ni mainly existed in the roots,while Cu and Zn had strong migration ability in wheat.According to the linear regression model of the root-stem-seed system of wheat,it was found that Cu and Zn had strong migration ability.According to the linear regression model of the root-stem-seed system of wheat,it was found that Cu and Zn had strong migration ability,Cr,Hg,Pb and Ni had weak mi-gration ability,and As had very weak migration ability.
万方数据
维普
