| The existence pattern of lead in farmland soil was sudied. According to the size of the content the forms was in the sequence:residual form>organic combination form>iron and manganese oxides form>cabonate form>exchangeable form>water soluble form,in which above 40% forms of lead had biological availability, and pollution index of lead was high above 1. The security asseseement of vegetable in mining area was also studied through plenting cabbage and crowndaisy chrysanthemum. The results showed that the farther from the mining area,the lower lead content in soil and vegetable. And the lead content of vegetable was positively related to soil. The content of lead in vegetable roots was far above leaves. The content of lead in crowndaisy chrysanthemum was higher than cabbage.There are different enrichment coefficients of roots and leaves.Rerults showed that cabbage and crowndaisy chrysanthemum planting in the mining area of 1 km range were not fit for human consumption. |
