| Urbanization is not only a significant symbol of industrialization andmodernization, but also an essential way to social and economic development. Sincethe mid-1990s, the urbanization rate of China has reached over30%. The rapidexpansion of urban scale has boosted a massive growth in the urban population. Theside effects of this development have put a growing intense pressure on the supplyof urban construction land. The total field land of China is less than18.3millionhectares, with population of more than1.3billion people. The arable land (acres) percapita ration is only1.38and with0.1acres of cropland resources which is about40%of average level worldwide. With the increasing level of urbanization in recentyears, the conflict between urban expansion and field land protection has alsoreached at a higher level. Therefore, how to improve efficacy of land use to meet thedemand of urban expansion without damaging the basis of food security has becomethe new focus of the content of the study of urban expansion.In this paper, Luoyang and Yanshi city are set as the research object. The datainvolved are remote sensing image data from year1980,1990,2000,2006and2013.Use software like ENVI4.7, ArcGIS, Excel and MATLAB through imageinterpretation, spatial overlay, statistical analysis and gray correlation calculationmethods to analysis characteristics of Louyang’s temporal and spatial variation, anddriving force under the urbanization background. The dynamic changes of Yanshi’sbuildings land use and arable land expansion were also studied in the paper to helpthe outcome.The main conclusions are as followings:1、Base on the characteristics of Lou yang’s expansion, with the considering ofquantitative growth, morphology, rational analysis and spatial variation, theconclusion can be sum as: From the year1980to2013, the built-up area of Luoyang has gained from91.29km2to226.24m2. In between the year1980to2000, the expansion rate waslow and it started to increase dramatically at the year2006. At1980, thecompactness of study area was high and the expansion was mainly outside-extendwith poor morphological rules in the next10years. Then, from1990to2013, theurban expansion was more about filling in the already extended areas. It is worthynotice that, before the year2000, the urban expansion cannot keep up with thegrowing of the population. And after the year2000, the situation reversed.Characteristics of Louyang’s built-up area can be sum mainly as:"peripheralspillover "," Jump development" and " internal padding”2、In this paper, qualitative and quantitative analysis are two methods thatmainly used. Base on natural and geographical conditions, socio-economicdevelopment, national policy control, the driving force of urban expansion can beexplained as:Natural and geographical conditions such as topography, river systems, andcultural site protection have significant impact on the urban development and layout.The correlation degree with urban expansion is showing decrease trend from orderas following: urbanization rate, population growth, industrial restructuring, incomelevel, GDP and investment in fixed assets. National policy and city planning havepromote and guide roles in urban expansion.3、The research results of Yanshi Urban sprawl and farmland changes are asfollows：The ratio of Yanshi’s urban sprawl is increased from0.47to0.79and theexpansion also shown strong spatial agglomeration. Affected by terrain andgeographical effects, it presents the "one center, two axis" mode of space changes.In the period from1990-2006and2006-2013, Yanshi had a high urban expansionpercentage which are80.1%and93%, this puts pressure on the cultivated landprotection and related policy should be considered. |
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