Regional Land Use Efficiency

Land use change is one hotspot of the current international researches,of which regional land use efficiency is one of the key contents.It has important practical significance to development and construction since China's reforming and opening up,especially the beginning of this century.In this study,Nantong of Jiangsu Province was taken as an instance,which is located in the Yangtze River Delta,a typical area of urbanization in eastern China.An improved Data Envelopment Analysis(DEA)Model based on the three factors of production theory and the input-output theory,the temporal and spatial variation of land use efficiencies of both urban and township scale as well as the relationship between various efficiencies and elements had been discussed in depth.The main contents of the research are as follows:Research content one:Land use efficiency content analysis and evaluation model building.The overview of domestic and international land use efficiency researches,which focused on the connotations of research content,the selection of study region,the choice of research method and so on,provided this study with references.Based on the relevant concept and theory of land as well as the three factors of production theory and the input-output efficiency theory,China regional land use efficiency was analyzed.With programming the improved Data Envelopment Analysis model according to the law of land use efficiency with different regional scales,such as Super-efficiency Non-radial DEA Model and Sub Parallel System Net DEA Model,the typical study area had been selected for the empirical analysis.Research content two:Nantong land use efficiency time series' changes evaluation on the city level scale.Nantong,the regional center city in the north wing of Yangtze River Delta Area,is a typical rapid urbanization area in China.Between 1996 and 2009,Nantong's farmland area went down in stage and construction land area went up in general.During this period,agricultural land use efficiency achieved relatively effective in four years and efficiency's volatility had improved after 2007.To those non-effective years,it needed to reduce all kinds of elements input,especially avoid agricultural fixed assets investment redundancy.At the same time?construction land use efficiency came to relative effective in 6 years,and it had entered a relatively better interval since 1999,particularly after 2007.Based on the sub-systems of agricultural land and construction land use to analyze Nantong land use efficiency,the agricultural land use efficiency lowered than the land use's except 1996,while the construction land use efficiency higher than it,with four years in a relative efficiency optimal state.On land use efficiency and input-output element correlation,construction land use efficiency had a higher correlation with land use efficiency than agricultural land's.In addition,the land use efficiency had a significant positive correlation with construction land use area,agricultural and nonagricultural output,while a negative correlation with agricultural land area and agricultural labor input.Research content three:Nantong typical regions' land use efficiency temporal and spatial changes evaluation on the township scale.Between 2005 and 2009,both Haimen,the economy relatively developed area representative,and Rugao,the economy developing area representative,kept a relatively stable township num'ber.The results of further studies on evaluation of agricultural land use efficiency,construction land use efficiency and improvement for inputs and outputs of theory in those 42 townships of Haimen and Rugao were as follows.In 2005,Haimen's agricultural land use comprehensive efficiency and technical efficiency were higher than that of Rugao in average with large difference among townships,while its scale efficiency was lower than that of Rugao in average.In 2009,except Haimen's average technical efficiency higher than Rugao's,its average comprehensive efficiency and scale efficiency were lower than Rugao's with the unchanged difference among townships.During this period,Rugao township input and output elements use efficiency in the agricultural production system decreased,while Haimen township input elements use efficiency increased slightly and improved township farmland intensive use to certain extent.At the same time,in 2005 Haimen's construction land use comprehensive efficiency and technical efficiency were higher than that of Rugao in average,while its average scale efficiency was lower than that of Rugao.The efficiency law in 2009 was similar to that in 2005.Although Rugao few townships greatly improved construction land use efficiency,its overall level was still lower than Haimen.Meanwhile,most township construction land use scale efficiency showed increasing returns in the two regions,in which Haimen township construction land use output was in a high level,while Rugao improved to a certain extent,which was in relation to regional township construction land intensive use improvement.By evaluating township land use efficiency in the system,because of higher basis those townships in the whole Haimen region had a high level of land use efficiency,as well as could further improve the efficiency with promoting agricultural production level.Thanks to its relatively weak basis,the limited resources were only available to few townships with certain conditions just to improve these townships' land use efficiency,and not conducive to other townships' development in Rugao.Besides,it was hard to play traditional agricultural output,so the entire regional land use efficiency was reduced.According to the relevancy among efficiencies and elements,the efficiency of township construction land use was the main impact factor to the land use efficiency.Construction land use efficiency played a bigger role to non-agricultural output in 2005,while agricultural land use efficiency had a reverse relationship to agricultural fixed assets input.To analyze the control effectiveness to land use efficiency from township fundamental governments,compared with 2005,economy relatively developed region Haimen's governments' control mainly played a negative role to both agricultural land and construction land.Meanwhile,economy developing region Rugao 's township governments played a sounding role in land use efficiency in 2005,but in 2009 there went certain negative effects as the economy's developing.