The Spatial Pattern And Driving Factors Of Public Service Facilities Lands In Mountainous City

Reasonable spatial distribution of public service facilities is an important content to ensure the fair distribution of social public resources,and it's the objective requirement of constructing serviceoriented government in our country.At the same time,with the economic development and the improvement of urban residents' quality of life,the public's attention to public service facilities is increasing day by day.However,under the effect of marketization,the phenomena of "mismatch" and "unfair" about public service facilities are common,and how to allocate public service facilities in limited land space is widely concerned.Public service facilities lands,on one hand are the core carrier of public service facilities,on the other hand are an important part of urban land.Land is rarely used as a starting point on the study of public service facilities,and most of the studies are lack of time span.Besides,the study of urban expansion is rarely based on public service facilities lands.Firstly,this paper analyzes spatial evolution characteristics of the public service facilities lands.Secondly,analyzing the spatial pattern of public service facilities lands based on the perspective of fairness.Thirdly,the driving factors of the spatial pattern of public service facilities lands are discussed.Firstly,this paper analyzes the spatial evolution characteristics of the public service facilities lands in 1978,1988,1997,2006 and 2011,mainly from the number evolution and morphological evolution.The number evolution is discussed from the two aspects of area change and land conversion.The morphological evolution is discussed from six aspects,which are along the main river,along with the main traffic shaft,the relationship with TPI,the circle structure and fan-shaped extension and landscape pattern evolution.Secondly,analyzing the spatial pattern of public service facilities lands based on the perspective of fairness.And the capita occupancy and spatial accessibility are the main indexes at fair evaluation.On the one hand,based on the index of capita occupancy,this paper analyzes the fairness spatial pattern of districts in 1997,2005 and 2011.On the other hand,based on the indexes of capita occupancy and spatial accessibility,this paper analyzes the fairness spatial pattern of streets(towns)in 2011.Thirdly,the driving factors of spatial pattern of public service facilities lands are discussed from the qualitative and quantitative perspectives.Qualitative analysis is from the aspects of geographical and historical factors,socioeconomic development factors and institutional policy factors.Quantitative analysis is discussing the driving factors of the expansion of urban public service facilities lands in the periods of 1997-2006 and 2006-2011,which based on the Logistic regression model.Finally,giving some advice on how to optimize the layout of public service facilities lands.The results show that:(1)The spatial evolution characteristics of public service facilities lands in Chongqing are as follows:(a)The areas of public service facilities lands are on the rise,and most of the new lands comes from agricultural land conversion;(b)Due to terrain limitation,the expansion of public service facilities lands are more concentrated in the middle of the slope and flat ground,showing a clear "3D" characteristics;(c)Public service facilities lands are expanding along the river and the main traffic axis;(d)Before Chongqing is directly under the central government,public service facilities lands have showed a circular structure around the five business districts obviously,and the main direction of expansion is the west.After 1997,thanks to the development of multi-center group,the circle structure gradually weakened,and the directions of expansion are north,south,southwest,northwest as well.(e)The spatial distribution of public service facilities lands shows center aggregation distribution before 1997,and after that,the spatial distribution shows the characteristic of large dispersion and small concentration.(2)Fair spatial structure of public service facilities lands:(a)The lands concentrate on the west and along the rivers in different districts in 1997,concentrate on east and west in 2006 and 2011.(b)Spatial pattern of public service facilities lands appears tricyclic structure of the inner and outer low and the middle high roughly in different streets based on the index of capita occupancy.(c)Spatial pattern of public service facilities lands appears west and middle high,east low roughly based on the index of spatial accessibility.(d)Autocorrelation analysis of spatial accessibility shows that regional distribution of the lands is not prominent,and the high reachability is clustered on the west of the study area,and the low reachability is concentrated on the marginal areas of the north,east and southeast.(3)The driving factors of public service facilities lands from the quantitative perspective: comprehensive factors of combination of geographical and historical factors,socio-economic development factors and institutional policy factors.Geography and historical factors refer to the influence of physical geography condition and history.Socio-economic development factors refer to the influence of economic development,rapid urbanization and population growth,traffic guidance and land market competition.Institutional policy factors contain public service facilities supporting standards,urban planning,and public service supply system reform.(4)The driving factors of expansion of public service facilities lands from the qualitative perspective: based on the logistic model,five indexes of the distance from the two rivers and the nearest straight road,the proportion of adjacent residential land,industrial land and public service facilities lands have significant influence on the conversion of public service facilities lands.The proportion of neighboring residential land is considered to be the most important factor.