General Spatiotemporal Patterns And Drivers Of Urbanization In Inner Mongolia Hubaoe Region

Global urbanization is main form of land use change,it has deep effect on environment and socioeconomic condition.Now,the urbanization around world has led to great change in landscape pattern,so understand the spatiotemporal pattern of urbanization has significant meaning to regional sustainable development.Recent studies have suggested four hypotheses of urbanization pattern,including diffusion and coalescence hypothesis,three growth modes hypothesis,landscape modification gradient hypothesis,diversity-complexity hypothesis,but their generality is yet to be adequately tested.Based on three urban and three banner of Hubaoe region as the research object,this paper used TM remote sensing data from 1990 to 2015.At the base of 3S,we studied on urban growth modes and landscape pattern of urbanization of research area in resent twenty-five years,at the same time,we tested four prominent hypotheses of urbanization patterns.In addition,combined with the statistical yearbook data to analyze the natural,society economical and policy driving force of research area.The mainly results as follow:(1)Urban expansion of Hubaoe region is a process of diffusion and aggregation.All three urban growth modes,infilling,edge expansion and leapfrog development,occurred simultaneously during urbanization,with changing relative dominance.The importance of the edge expansion is reflected in the entire urban expansion process,but also has a decisive role in the growth of urban area.(2)From 1990 to 2015,urban expansion pattern of each urban and banner has a similar waveform change pattern in space,but it is different in a certain time range.In the urban extent,leapfrog urban growth mode presents a bimodal structure corresponding to the urban "diffusion" process,while in most of banners,it shows a unimodal change pattern.The time period that city was dominated by leapfrog mode for urban expansion is the "diffusion" phase.(3)From 1990 to 2015,the infilling mode in most cities presented a bimodal or multimodal structure corresponding to the urban "aggregation" process,and only Baotou showed a unimodal structure.The time period that city was dominated by infilling mode for urban expansion is the "aggregation" phase.(4)From 1990 to 2015,with the diffusion and aggregation of the city,the AWMEI and the urbanization expansion modes revealed a high frequency wave-shaped pattern in space,indicating that urban form of Hubaoe region is still in a state of instability,especially at the urban level.(5)From 1990 to 2015,urban landscape pattern of Hubaoe region showed that the fragmentation degree and the shape complexity of urban patch both increased,and the connectivity decreased.In addition,urban landscape pattern tends to be heterogeneous.(6)The four hypotheses of urbanization patterns include diffusion and coalescence hypothesis,three growth modes hypothesis,landscape modification gradient hypothesis,diversity-complexity hypothesis.They were not only applicable to some large cities or mega-cities,but also for some small or medium-sized cities that they have different development processes and functions in Hubaoe region.(7)Natural,society economical and policy factors were the important driving forces of spatiotemporal pattern changes of urbanization.First of all,natural factors mainly limited the direction of urban expansion,and economic growth and industrialization of socioeconomic factors were important driving forces for the rapid expansion of urban construction area,while the adjustment of industrial structure has a decisive role in the change of urbanization model.In addition,national and local policy reform made the pattern of urbanization has a mutability and also a driving force cannot be ignored.