| In the process of urbanization,land use change is an important factor which affects the social and economic development and ecological stability of the region and even the whole world.As the city's most intense human activities,how to effectively and accurately obtain the comprehensive characterization of large city longitudinal expansion of the study area,the difference of influence mechanism,try to simulate dynamic spatial pattern of city development in the future,to seek the path of sustainable development of the city has become the important content of the city.This paper focuses on the thinking on the southwest city of Chinese typical fast research background,through the calculation of the model of land use,the main city of Chongqing City,Chengdu City,Guiyang City area,Kunming city Dianchi administrative area of land use changes and ecological effects of the research content,and using ArcGIS9.3,ENVI5.0 and GeoSOS1.2.1 software.In the city expansion strength and fan analysis method,index model of comprehensive use of city expansion,the city expanded the dynamic evolution characteristics of in-depth study,and a detailed analysis of the evolution mechanism of the expansion of different natural landscape and social economic factors on the role of the city and the degree of interference.At the same time,it also provides a reliable scientific basis for the further study of the typical urban landscape pattern evolution and prediction in the southwest of china.Here are the main contents and conclusions:(1)Before 2001 year,the typical city southwest land transfer type relatively small scale,the single dynamic degree of land use,land use dynamic degree and land use intensity is low,landscape artificial interference region changed slightly,except for Chengdu metropolitan area;after 2001 year,the city land use dynamic change of speeding up the process of conversion between construction land with other types of land have increased dramatically,the single land use dynamic index,the comprehensive dynamic degree of land use and land use intensity index rising,resulting in high intensity region landscape artificial interference has also been significantly expanded.(2)Before 2001 year,in addition to the Chengdu City area,the construction of typical land in the southwest of the city scale expansion,expansion speed and strength showed weak expansion characteristics;after 2001 year,the scale and growth rate of construction land expansion in the city have maintained rapid growth trend,city expansion intensity continues to deepen,but the local area the expansion of the city still exists obvious uneven characteristics.The model of urban expansion in southwest typical cities is mainly edge-jump dominant or edge dominant.(3)The PD and SHDI values of the North-South Transect and east-west transect of the typical cities of Southwest China have obvious regularity.The change trend from the study area space landscape index,near the city center of PD,LSI,SHDI value is low,far away from the city center of PD,LSI,SHDI value is high;and with the increase of time,close to the city center of PD,LSI,SHDI value was decreased annually away from the city center,PD,LSI,SHDI values showed a trend of increasing year by year.(4)The number of cellular in 2007 and 2016 in Shapingba District,Wenjiang District,Baiyun District,Chenggong district construction land expansion status of the largest growth,reduce the maximum number of paddy or upland,and construction land almost coincides with the increase in the number of cellular.And the simulation accuracy of urban expansion in Shapingba in 2016 was relatively low,only 75.8%,and the rest of the research areas were above 83.2%;With the expansion of the city in 2016 compared to the status quo and simulated forecast scenario showed expansion of the city on 2025,the study area of the city spatial expansion along the main traffic line railway spread,a significant influence factor,ecological landscape is well preserved,with the effect of city development in the future. |
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