Gray Correlative Analysis of the Impact from Growing Urbanization Process on Pedodiversity in Nanjing Area
城市化对南京地区土壤多样性影响的灰色关联分析

More and more natural soil resources have been occupied by the rapid urbanization in the Yangtse Delta. Based on the data of TM images (30m×30m) of three different periods (1984, 1995 and 2003), this paper analyzed the expansion of Nanjing area in the past 20 years using the method of multi-source information integration and multi-phase-successive -comparison with the aid of RS and GIS techniques. Combined with the soil map of Nanjing, we calculated the pedodiversity (HP), evenness (Jsw) and richness (R2) indices of Nanjing by the diversity measure methods borrowed from biological studies. Then it studied the spatial-temporal dynamic change of pedodiversity pattern in Nanjing area. Finally, it explored the impact of urbanization on pedodiversity with gray correlative analysis model. The result shows that the expansion of different administration units has various impacts on pedodiversity with village, the most significant impact, sharing 60%, town about 26%, city 7%, and county 7% of the total study area.