[Landscape Patterns Characteristics of Soil Heavy Metal Pollution in a Town of Southern Jiangsu].

It is of great significance to evaluate the soil heavy metal pollution level and to know their spatial distribution characteristics. Taking soil heavy metals As, Cd, Cr, Cu, Hg, Ni, Pb and Zn in a town of southern Jiangsu as research objects, using the single factor evaluation method, Nemerow comprehensive evaluation method, geostatistical analysis method together with the landscape pattern grain effect and the landscape index analysis method, we studied their characteristics of landscape patterns in the study area based on pollution evaluation. The results showed that:① The average value range of single factor pollution index and Nemerow comprehensive evaluation index for soil heavy metals in study area was 0.145-0.893.The overall pollution level was low. The pollution level of south area was lower than that of north area; ② As, Pb, Hg, and Zn elements showed obvious non-point pollution characteristics.As and Pb showed a similar spatial distribution. So were Hg and Zn elements. In contrast, Cd, Cr, Cu and Ni elements showed obvious point pollution characteristics. Cd and Cr showed similar spatial distribution. So were Cu and Ni elements; ③ The suitable grain effect landscape index of nine soil heavy metals pollution landscape was 30-40 m; ④ The low concentration area of soil heavy metals in the study area accounted for the largest proportion. The border of lower concentration area was the most complex part. The distribution of all pollution level areas was relatively concentrated and the comprehensive pollution fragmentation degree was low. The source pollution of soil heavy metals was in concentrated distribution, and its number still counted low, but there was a tendency for further development. As a whole, it was still in the early pollution stage of soil heavy metals.