Research on heavy metal accumulation in soil in an organic kiwi fruit production base

The contents of heavy metals like Se,Pb,Hg,Cd and Cu in the soil of the organic kiwi fruit production base in Zhouzhi Country of Shaanxi Province were investigated and analyzed.The results showed that:(1) The average contents of Se,Pb,Hg,Cd and Cu in the soil were respectively(14.22±12.38) mg/kg,(21.27±4.26) mg/kg,(0.65±0.50) mg/kg,(0.32±0.09) mg/kg and(20.22±16.69) mg/kg,and the accumulation of heavy metals in soil was not obvious,not surpassing the environment quality standard for soils GB15,618-1,995. But there were 4 samples of Se and 1 sample of Hg content which exceeded the permitted level;(2) Using a single factor of soil quality environment pollution index to evaluate the average single factor pollution index of soil heavy metals of all the soil samples,the result was smaller than 1,so the tested orchards were fit for developing green kiwi fruit production and also met the environment requirement for soil.The order of pollution indexes of various soil elements was: HgSeCdCuPb,among which the average index of Cd,Se and Hg reached 0.54～0.655,and the single item pollution index of Hg was the highest.