Research On Temporal-spatial Changes Of Urban Construction Land Use Economic Efficiency In Jiangsu Province

With the speeding up of urbanization, the city is intensifying expansion extensively.It's worth exploring that low urban construction land use efficiency is against to land economical and intensive land use. The economic efficiency of construction land use is an important indicator of construction land use reasonableness. As the research object,probing into urban construction land use level of economic efficiency is conducive to a balanced as a whole the region economy, promote the improvement of urban economical and intensive use level.Taking Jiangsu province as the research area, using data envelopment analysis method, the study calculates the urban construction land use economic efficiency of 55 cities and counties in 2006-2015. By calculating Malmquist index and exploratory spatial data analysis method to study the change trend of efficiency value. On this basis,analysis the possible influencing factors by the spatial lag of cross section data model and spatial error model. The result can provide a basis reference to make the economical and intensive construction land use efficiency.The results show that the relative efficiency value turn down from south to north in the regional Jiangsu province. At three different levels of the administrative division,the relative efficiency value of the prefecture level city and county are both higher than county-level cities. High efficiency value accumulation concentrated close to the Yangtze river, in south Jiangsu, while the low efficiency value zones are mainly distributed in north Jiangsu area, but does not include Xuzhou city and the cities and counties in their jurisdiction. The influence factors, by using spatial econometric model regression results, show that the degree of industrial structure, level of economic development , human relations, government intervention plays positive role in promoting the economic efficiency of construction land. During the research time, the level of government intervention is changed from significant to not significant positive influence, while attract foreign investment by negative becomes positive effect coefficient values.Research suggests that combining data envelopment analysis and Malmquist index can more fully to measure economic efficiency of land used for urban construction,from both the static and dynamic state. Exploratory spatial data analysis and spatial econometric model can be more effectively study the efficiency of the space characteristics. Most cities of southern and middle of Jiangsu locates in the Yangtze river delta economic circle, its economic opening degree and development level are in a leading position. The influence of the main causes of economic growth has become to pure technical efficiency and the technological progress. Due to the geographical disadvantage, economic development of Northern Jiangsu region lags behind. Scale expansion can still promote the efficiency, especially in the unit of counties, county-level cities. In addition, sustaining economic growth trend, promoting industrial transformation and upgrading process, coordinating development of population urbanization and land urbanization, improving degree of government intervention, and establishing the system of economical and intensive land use policy system can provide a good city environment for construction land use, which indirectly promote urban construction land use economic efficiency.