Study On Coupling Relationship Between Land Ecosystem Service Value And Urbanization In Hefei Metropolitan Area

Urbanization plays a leading role in regional socio-economic development and is an inevitable trend in the development of human society.The rapid urbanization process has led to changes in land cover and land structure,which has affected the changes in the structure and function of the ecosystem,resulting in a decline in land ecosystem service functions and hindering the sustainable development of the region.This thesis takes the Hefei metropolitan area as the research object,based on geography and land ecology theory,and uses GIS technology to analyze the characteristics of land use changes in Hefei metropolitan area based on remote sensing imagery data from 2000,2005,2010 and 2015: Using the equivalent factor method as the assessment method,the ecosystem service value of the Hefei metropolitan area was estimated by modifying the value coefficient,and its temporal and spatial variation characteristics were analyzed: Based on the quantitative measurement of the urbanization level of each county(city)in Hefei metropolitan area,the coupling between city town-rizationand ecosystem service value was analyzed using capacity coupling function and coupled coordination model.The maiimportant research conclusions are as follows:(1)Law of landuse change in Hefei metropolitan area.The change of land use quantity in the Hefei metropolitan area during the study period showed a trend of “four reductions and three increases”;The flow of cultivated land is high and the number of transfer is far greater than that of the transfer.82.31% of the area turned out to be the construction land,distributed in the surrounding area of the urban built-up area,and the circle structure expanded;the level of land use was above medium level,the spatial difference was significant and the degree of dispersion increased continuously.(2)The evaluation of Hefei metropolitan ecosystem services and the characteristics of time and space.During the study period,the total value of ecosystem services and various functional service values in the Hefei metropolitan area experienced a period of increase and decrease,but the overall improvement;Waters is the most valuable,followed by forest land,accounting for 55.2% and 15.8% of the total value respectively.The hydrological regulation function has the highest value,followed by climate regulation,which accounts for 63.16% and 12.52% of the total value of the ecosystem services.The water supply is negative,and the absoulute contribution is closeto the climate regulation;The spatial heterogeneity of service value of the land ecosystem in Hefei metropolitan area is remarkable,but the change range is small in the study period,the overall spatial differentiation pattern is basically the same,showing the change law of gradual decreasing from the area to the center,the value of the western region is higher than the East,the spatial agglomeration is obvious,and the ecosystem is ecological system.The spatial distribution of high value and sub high value areas of service function value is consistent with the spatial distribution characteristics of low and low land use degree.(3)Study on the coupling between city town-rization and ecosystem service value.The comprehensive urbanization level of all counties(cities)in the Hefei metropolitan area has significantly improved during the study period,but the level of development is still not high,and the absolute gap and relative gap between counties(cities)are continuously increasing,and the extreme value trend is increasing.Obviously,the space appears to be high in the east,low in the west,low in the south and high in the north,and the spatial features of the central elevation are prominen;During the study period,the average coupling and coupling coordination degree of urbanization and ecosystem service value in Hefei metropolitan area was 0.8610 and 0.4184,respectively,and the interaction between urbanization and ecosystem service subsystems was significant.Because of these two The overall function and overall development level of the system is not high,the coupling coordination relationship is mainly on the verge of maladjustment,and the type of coupling coordination has been blocked by the urbanization of the entire region in the early stage of the study.This has led to the obstruction of urbanization in the western part of the region and the backwardness of ecosystem service in the eastern and central regions.The spatial characteristics.