Spatiotemporal Differentiation Characteristics And Zoning Optimization Strategy Of Production-Living-Ecological Function In Lijiang River Watershed

With the rapid advancement of industrialization and urbanization,while our economy develops rapidly,the development order of territorial space also appears disorder,which made the contradictions between the internal functions of territorial space become increasingly prominent,and brought serious challenges to the high-quality development of regions.With these concerns,it is necessary to analyze the evolution characteristics of the production-living-ecological function of the territorial space and to optimize the zoning.At present,there is a lack of research on the production-living-ecological function in karst watershed areas,as well as multi-scale and spatio-temporal zoning optimization research.In view of the above problems,this paper firstly analyzes the spatial and temporal distribution characteristics of the production-living-ecological function in the Lijiang River watershed from 2010 to 2020 respectively from the administrative units scale and 3km×3km grid scale,and then discusses the factors influencing the spatial differentiation of the production-living-ecological function.In the end,a zoning method integrating administrative scale and grid scale is proposed to carry out spatio-temporal zoning of production-living-ecological function in the Lijiang River watershed,and further raises strategies for the development of each type area.The results show that:(1)From the perspective of administrative units scale,the index of production function(PF),living function(LF)and ecological function(EF)increased by 142.93%,6.37% and23.85% respectively.The area with high-value of PF expanded from Guilin city to Lingchuan County,Xing ’an County and Pingle County,the area with high-value of LF mainly in Guilin city,Lingchuan County and Xing ’an County,while the area with high-value of EF shifted from the middle and northern part of the watershed to the west and eastern part of the Lijiang River watershed.In addition,the coupling-coordination type changed from transition type to coordination type on the whole from 2010 to 2020,and the coupling coordination degree of the Lijiang River watershed showed an upward trend,a total increase of 5.98%.Among them,the number of regions classified as unbalanced and transitional decreased,while the number of regions classified as coordinated increased,and except Yongfu County,municipal district and Gongcheng County,the coupling coordination degree index of other cities and counties was on the rise.(2)From the perspective of grid scale,the study area is mainly woodland and cultivated land,the transformation among different land use types was more uniform and the land use pattern was stable.The index of PF and LF increased by 0.77% and 23.85% respectively,and the area with high-value of PF and LF were concentrated in the lower elevations of the study area and Guilin urban area respectively.The index of EF decreased by 1.39% over the same time period,and the area of high-value of PF was distributed along high elevations.From2010 to 2020,the variation range of production-living-ecological function is PF < LF < EF.Among them,the area of enhanced PF and LF in the latter stage increased by 4.0% and 11.6%from the previous period respectively,while the area of weakened function decreased by 3.2%and 9.4% from the previous period respectively.The area of enhanced and weakened EF decreased by 16.4% and increased by 17.3% from the previous period respectively.In the past ten years,the center of gravity of PF and LF moved to the northwest as a whole,while the center of gravity of EF moved to the southeast as a whole.(3)The factor detection results show that factors such as natural condition and ecological environment have a great influence on the dynamic change of production-living-ecological function.In both 2010 and 2020,DEM,population density and NDVI index are the main factors affecting the production,living and ecological function respectively.DEM∩NDVI index has the largest influence on production and living function,while population density∩NDVI index has the largest influence on ecological function.(4)The Lijiang River watershed is divided into five types of functional areas: production function-leading areas,ecological function-leading areas,production and living function-leading areas,production and ecological function-leading areas and production-living-ecological function-coordination leading areas.Among them,the production-living-ecological function-coordination leading areas should focus on exploring characteristic industries in the future,while the other types of areas should focus on guaranteeing the superior functions and improving the inferior functions in the future.