The Multi-functionality Evaluation And Regionalization Research Of Land Use In Sichuan County

In recent years,with the rapid development of China's economy and society,the population continued to increase,urban space constantly expanded.As a result,the use of land resources has become increasingly tense,and the way and pattern of land use have undergone drastic changes,triggered a series of problems among agricultural production,construction development and ecological environment protection.The diversity of regional socio-economy has lead to the diversification of regional land use functions,which helped the transformation of land use functions from a single function to multi-functionality,and the diversification of regional land use functions gradually emerged.How to objectively recognize the multi-functionality changes in land space,grasp the law of the multi-functionality of land use,and accurately locate regional land use functional characteristics were of great significance in realizing the coordinated development of regional social,economic,and ecological environments,and the rational planning of regional functional positioning.This paper took the county of Sichuan Province as the research area,firstly established the evaluation index system of land use multi-functionality,used AMOS confirmatory factor analysis to reduce the index,and then used the revised structural equation model to determine the factor load and the path coefficient.Based on the weights of the indicators,the land use multi-functionality values of Sichuan counties in 2005,2010,and 2015 were calculated.Then the spatial-temporal evolution of land use function in the study area was analyzed.Finally,the functional partition of the study area was proposed by the two-dimensional graph theory clustering method and proposed countermeasures.The main findings were as follows:(1)In terms of time,the social,production and ecological functions of land use in Sichuan Province have changed in some degrees.During the study period,the differences of social functions were obvious,which indicated that the polarization trend of social function values among counties was obvious.The standard deviation of the production function was in the trend of continuous growth,which indicated that the gap of counties was gradually expanding.The coefficient of variation of production function was the largest,showing a trend of declining volatility.The variation coefficient of multifunction of land use was the smallest,which showed a steady growth trend and all the functions of the county were changing,the multi-functionality level of land use among counties was increasing although the differences of regions ware becoming more and more obvious.(2)In terms of spatial dimension,in Sichuan Province,the high-level and medium-high level land use social function areas mainly clustered in the Chengdu Plain,northeastern Sichuan and southern Sichuan,and the number of low-level regional counties was significantly reduced.The number of county districts with high level,medium and high levels of land use production function value was increasing,mainly in the vicinity of the Chengdu Plain,but the trend has declined,and the low level regional change was relatively stable.The northwest of Sichuan was a high-level area of land use ecological function,the middle-high level area had a clear southward trend,and the low-level area was continuously shrinking.The level of multi-functionality of land use was generally represented by the spatial distribution pattern of low elevations in the east and high in the middle and high gradients in the central and southern parts of the country.There were significant differences between regions.(3)In terms of the spatial evolution of multi-functionality use of land,the multi-functionality level of land use in most counties showed a tendency of rising or stabilizing with only obvious fluctuations or declines in some counties.The social function of land use and the multi-functional center of land use were all located in Renshou County,moving to the southwest direction and retreating to the northeast.The center of production function of land use was located in the territory of Ziyang and continued to move south-west.The center of ecological function of land use was located in Qionglai and Pujiang County,and continues to move south-east.The moving speed of the production function and the ecological function from 2005 to 2010 was faster than the year from 2010 to 2015.(4)Based on the two-dimensional graph theory clustering method,combined with the evaluation results of multi-functionalities of land use in Sichuan Province and the main functional zonation of Sichuan Province,Sichuan Province was divided into 3 types and 10 subareas.Social function areas included Chengdu Plain area,northeastern Sichuan area and southern Sichuan area.The production function area included the Panxi area,the western margin of the basin and the shallow hilly area of the central plain of the basin.The ecological function areas included the Qinba Biodiversity Ecological Functional Area,the Zoige Grassland Wetland Ecological Functional Area,the Sichuan-Yunnan Forest and Biodiversity Ecological Functional Area and the Liangshan Mountain Soil and Biodiversity Ecological Functional Area.