Evaluation Of The Efficiency Of Economical And Intensive Use Of Construction Land Based On The Non-expected Output SBM Mode

The economical and intensive use of built-up land is of great value to the spatial planning of the national territory.In recent years,the state has vigorously advocated the economical and intensive use of all kinds of resources,and land resources,as the bearing unit of national development,need to avoid waste and over-occupation of land due to improper planning,construction and management,and to protect limited land resources.Therefore,it is particularly important to analyse and evaluate the efficiency of the economical and intensive use of built-up land.Thanks to the high accuracy and authority of the data from the Third National Land Survey and the Land Change Survey,this paper uses these two high-precision spatial data as the basis to analyse the efficiency of the economical and intensive use of built-up land and the differences in its spatial pattern,to explore in depth the evaluation indicators and methods of the efficiency of the economical and intensive use of built-up land,and to provide some reference value for the study of the spatial pattern of the efficiency of the economical and intensive use of built-up land.This thesis takes 14 typical cities with growing and decreasing population as the research area,and the main research contents are as follows:(1)The establishment of the evaluation index system of the efficiency of the economical and intensive use of built-up land and the introduction of the SBM model of non-expected output super-efficiency.Fourteen typical cities were selected by calculating the change of urban resident population,and the area of built-up land and the area of woodland and grassland in each typical city were obtained based on the data from the Ministry of Natural Resources’ Land Change Survey and the Third National Land Survey during 2018 s to 2020 s.According to the selection of indicators in the "Regulations on the Economical and Intensive Use of Built-up land",three ecological input indicators of ecological intensity,ecological growth land consumption index and ecological land elasticity index were added,while the expected output indicator was the value of secondary and tertiary industries,and the non-expected output indicator was industrial sulphur dioxide emission to build the indicator system.(2)Calculation of the intensification and efficiency of the economical and intensive use of built-up land in 14 typical cities.According to the constructed index system and model,the built-up land of 14 typical cities was analysed in terms of the efficiency of economical and intensive use of land change between two years,and the correlation between the efficiency of built-up land and regional population and land change was also analysed in conjunction with data such as population change rate and built-up land area.In terms of urban development types,cities in the northeast are basically of the sluggish development and rough expansion type,while cities in the south are mainly of the inefficient expansion and tapping development type;at the level of coordinated development,areas with declining population are the main ones,showing a more obvious disparity between population change and the development of the built-up land saving and intensive index.In the case of the South,the development is mainly in the form of inefficient expansion and tapping into potential development.Some areas with population growth also show incongruous development.(3)Study on the spatial pattern of built-up land saving and intensive use efficiency in typical cities with population growth and decline.On the basis of the research at the local and municipal levels,the two most typical cities in terms of population growth and decline were selected as the target of the study to continue the efficiency and spatial analysis at a finer scale.The spatial analysis method of ESDA exploratory data was introduced,combining the efficiency values obtained from the index system and model analysis,and the spatial pattern analysis was carried out on the basis of numerical analysis of the efficiency of the economical and intensive use of built-up land in the region,summarising the development patterns of built-up land in each of the two typical cities from a spatial perspective,and analysing the current situation of the economical and intensive use development.The spatial pattern of the economical and intensive development of built-up land in Shenzhen shows a difference of "low at both ends and high in the middle" plus "high in the south and low in the north",with Luohu and Futian being the main high and high gathering areas,and Longhua,Guangming and Bao’an districts in the northwest of Shenzhen spreading outwards with the intersection of the three districts as the centre.From the perspective of the overall spatial distribution of Suihua,the spatial pattern of "low in the middle and high at the ends" is different in the direction of 45° east of north.Among them,high aggregation is mainly in Suiling County,while low aggregation is found in Zhaodong City.