| Under the background of ecological civilization construction,the optimization of territorial spatial planning and development and utilization has become an urgent strategic task for China's development.As a demonstration zone of China's ecological civilization construction,the intensive,efficient and green development of territorial space is the basic guarantee for the strategic realization of the Yangtze river Economic Zone.Located in the upper reaches of the Yangtze River Economic Belt,Yibin is a typical node city along the river.In recent years,the combined advantages of the Jinsha River hydropower development,the high-speed rail economy,the port radiation effect,and the important hub portal for the southward development of Sichuan have become a new driving force for the development of Yibin.Rapid industrialization and urbanization have enhanced the intensity of its territorial space development.Against the background of the great efforts to protect the Yangtze River and enhance an ecological barrier and water conservation function in the upper reaches of the Yangtze River,how to identify the functions of territorial space,analyse the develop conflicts and optimized ideas,form a new pattern about the development and protection of territorial space and innovate the optimized development and utilization model of territorial space in Yibin is urgent problem.Based on the actual needs and the current situation,this study clarified the driving characteristics and spatial trend characteristics of territorial space by analyzing the natural geographical elements and existing development elements of Yibin and combining the pattern and functional features of space development in the historical period.Combined the analysis and zoning of current status functions and the conflict measurement and classification of development and utilization,on the basis of a comprehensive analysis of the status of spatial functions and guided by the calibrated function and optimization objectives,an innovative model for the optimal utilization of territorial space is put forward.Finally,on the basis of sorting out the existingproblems in the development and utilization of territorial space in Yibing city,the optimization ideas are proposed from the perspective of the municipal level and the multi-objective balance between the protection and development of the territorial space in the upstream of the Yangtze River Economic Zone.The main conclusions of this work are as follows:(1)The interpretation data of 30 m resolution remote sensing images at seven time nodes in 1990,1995,2000,2005,2010,2015 and 2018 were used to analyze the evolution characteristics of the territorial space in Yibin during 28 years.The main conclusions are as follows: The main distribution area and expanding area of living space in Yibin are in the middle of the city,and the distribution characteristics along the river are remarkable.The production space is mainly distributed in the central and northern part of the city,with flat ground and low hill areas along the Minjiang river and the Yangtze river being the most concentrated.The ecological space is mainly distributed in Pingshan County in west of the city and Xingwen County,Changning,Gongxian and Junlian County in the middle and low mountainous areas in the south.In terms of the altitude gradient,the slope range from 2° to 8° and above 15 °,and the altitude range from 236 m to 600 m is a severe area of spatial change.Judging from the horizontal direction,the spatial change of territorial space in Yibin takes the Yangtze River as the axis,and the range of 10 km on both sides of the river is the area where the change in spatial land type is most concentrated.In the past 28 years,the space development of Yibin has experienced an evolutionary process: driven by the budding state from driven by external forces,driven by the emergence of endogenous power to driven by the internal and external power.However,the features of spatial functions tend to be stable from primitive fuzziness from dependency of external demand,instability,functional reconstruction to internal and external functions.Before 2000,the spatial development pattern of Yibin is characterized by the development of agriculture,industry and mining.Since then,its spatial development turned to the basic development pattern around the city and industrial park.(2)The entropy method was used to evaluate the three living,producing and ecological functions of 185 townships in Yibin,the main conclusions are as follows: "Living,producing and ecological" functional areas account for about 20%,and non-significant areas account for about 80%,which is reflected in the phenomenon of the two-eight laws.According to the cluster analysis of the evaluation results,the township functions in Yibin are divided into 5 functional areas: Urban life-industrial production advantage areas(12%),Urban life-rural life advantage area(8%),Rural life-agricultural production-ecological function product supply advantage area(29%),Rural life-agricultural production-ecological service function advantage area(20%)and Ecological service function-agricultural production function advantage area(31%).Then the proportion,distribution and type characteristics etc of each functional area are simply analyzed.(3)Based on the upper limit,structural and bottom line thinking,the conflict of development and utilization of territorial space in Yibin is measured and analyzed from three aspects: comparison of current development intensity and exploitable intensity,conflict measurement of landscape ecological index,land use status and suitability evaluation of territorial space.The main conclusions are as follows: There are three types of conflict inducements caused by development intensity:terrain-restricted,urban-intensive and nature-protected areas.From the perspective of landscape ecological conflict index,the average spatial conflict index of Yibin in the four periods of 1990,2000,2010 and 2018 is 0.56,0.53,0.52 and 0.51,respectively,indicating a decrease in the level of conflict over time.Through the superposition of the development status and suitability evaluation results,the townships are divided into three types: urban conflicts,agricultural conflicts and ecological conflicts.Based on the three types of conflicting township grading and division,the discriminant conditions(27 kinds)are set.According to the comprehensive conflict types and merging in Yibin,20 kinds of combined conflicts which are obtained from the spatial superposition results of the three kinds of conflicts in 185 townships are divided into 8 kinds of conflicts.(4)By setting assumptions and looking for theoretical and practical basis,a framework structure model for territorial space optimization and management is put forward.The core connotations are as follows: on the premise of focusing on thedefinition of basic functions,under the premise of focusing on the definition of basic functions,the functional division is weakened within the basic control unit of land space,and the frame structure of a spatial basic unit is determined through the decomposition of the development and management indicators of territorial space.The current status of limited development vitality under the influence of a single subject's functional constraints and the extension of the control zone or line are breaken,and we encourage the independent optimization of space under limited conditions.According to the proposed model,Shaping Street with high urbanization rate and Bowangshan Town with agricultural production and living space as the typical case areas are selected as the typical areas.According to the proposed model,Shaping Street with high urbanization rate and Bowangshan Town with high proportion of agricultural production and living space are selected as typical case areas.Then the frame structure pattern is used to identify the theoretical exploitable space.Based on its development status,practice and existing problems,specific optimization ideas are proposed in conjunction with the framework structure model.(5)In view of the six problems in the utilization of territorial space in Yibin,the suggestion that relying on the results of double evaluation as soon as possible at the spatial planning level is proposed.Taking the range of 0?10 km along the river as the essential area,while delimiting the development boundary of the city's periphery,the compression boundary along the river within the city should be delimited.According to the specific terrain and the radiation of the urban functional area,the development intensity is graded gradient.The point and line ecological corridor should be determined to properly divide the urban living and industrial area.At the level of spatial governance,it is necessary to re-evaluate the spatial functions and conflicts of townships within 5?10 years,and formulate different spatial governance strategies based on different functional definitions and conflict performance.At the same time,it is necessary to make full use of the bottom-up transmission mechanism optimized by the basic space management unit under the constraints of the frame structure mode.On the basis of controlling optimization and policy optimization,the role of autonomous optimization should be pay more attention.At the specificimplementation level,it is necessary to manage the planning and operation of industrial parks,explore the comprehensive model of the transformation and development of southern mountain areas,pay attention to the economic benefits of ecological space and protecting permanent basic farmland and delineate permanent rural areas.The innovations of this paper are as follows: the analysis of production-living-ecological function and the elements correlation of territorial space that based on the township scale,the attempt to measure and analyze the conflict of territorial space from a comprehensive perspective,the comprehensive consideration of the top-down target decomposition and the bottom-up function independent optimization in the spatial optimization.The insufficiency of this paper is limited by the comprehensiveness of data,standardization and uncertainty of spatial basic units.Meanwhile,the scientificity of spatial function analysis and evaluation still needs to be improved.Besides,the decomposition in downscaling management and control indicators of the framework structure model needs further analysis.In general,the research results of this thesis provide research support for new round territorial space planning of Yibin,have some reference significance in the methods and ideas of territorial space planning and optimal development of node cities along the upper reaches of the Yangtze River Economic Zone.On the other hand,through the township-scale research and possible innovations,it is helpful to enrich the research achievements in the field of territorial space optimization and development. |
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