Spatial variability of soil Pb—A case study from Wutan Town, Chongqing City

The spatial variability characteristics of Pb in soil at Wutan Town in Chongqing were studied using geostatistics method. The results show that the Pb has a good spatial structures. The spational distribution of Pb in a small region is not obviously varied, which is correlated with fertilization, crop, the level of management and so on. But the spatial distribution of Pb has gradually changed in the secondary region. The Pb concentration in paddy field is obviously higher than that in dry land because of the technique of management and water condition. The content of Pb which is lower than the national arterial criterion accounts for 29.79%, and which is lower than the national secondary criterion accounts for 70.21% in the whole region. The light pollution area accounts for 49.16%, and the medium pollution area accounts for 21.05% in the whole studied region.