Distribution and Evaluation of Heavy Metals of Agricultural Soil in Typical Earthquake Disaster Area

Xinhuang village,Pengzhou city is a typical 5·12 earthquake disaster area,from which twenty-nine soil samples were chosen.Among these,soil profile of paddy field was sampled according to soil layers.The study was made mainly on space distribution and pollution evaluation of Cd,Cu,Pb,Zn.The content of heavy metals in the soil samples of this village was different,with the order being ZnCuPbCd.Average content of heavy metals of the farming soil was higher than that of the non-farming,and average content of heavy metals of the soil under settlement spot was higher than that of the non-settlement spot.Heavy metals content of the paddy field soil reduced gradually along with the soil layer deepening,and heavy metal content of the soil under settlement spot was higher than that of the natural paddy field in the identical soil layer.Soil Cd was the heavy pollution,Cu was the light pollution,Zn was the early warning,and Pb was not polluted.Sequence of soil comprehensive pollution index was CdCuZnPb.34.48% of samples were polluted,most of which were sampled from paddy field under settlement spot.