Study On Change Of Soil Resources Quantity And Quality In The Peri

The urbanization is inexorable trend of the human social development and inevitable result of the economic technological progress. Rapid urbanization has a huge impact on soil resources, bringing serious challenges to food security, ecological health, and environmental safety. Urbanization is causing and increasing enormous pressure on soil resource and soil environment in peri-urban area. This paper dealt with the effects of urbanization on soil resource quantity, soil fertility quality and soil environmental quality on the basis of field investigation and laboratory analysis. Our study started from the theories of urbanization and combine with application of the technology of RS and GIS. The results were listed as follows:The former major parts of the city were stabilized from 1984 to 2003 year due to space limitation, and meanwhile, urbanization process in the peri-urban areas was accelerated. The modes of urban sprawl of city differed at different stages. At the first stage, the scattered towns and villages around the fringe of the city were rapidly urbanized. Then, the main blocks of city were connected with the urbanized peri-urban areas, and the new administrative and commercial centers were developed. According to the city planning, the designed Economy Development District would be mostly subjected to urbanization in the near future. The main cause of the sprawl of town was the advance of industrialization lever. Furthermore, by overlaying the distribution map of new built-up areas on the soil map of the region, it was shown that significant decrease of soil area formerly used as vegetable lands and farmlands in the peri-urban zone.It was indicated that the contents of OM, total and available N, P in topsoil (0-20 cm) varied greatly across the study area, demonstrating a strong influence of land use practices on soil fertility. By contraries, CEC and content of total K in topsoil displayed very little variation across the space, reflecting some of common genetic characteristics (light texture and K-rich parent materials) of the soils in the area. Compared to the data obtained in the period of the Second National Soil Survey conducted in 1986, the contents of OM, total N,...