Transformation Of Land Use Function And Response Of Eco-Environment Under The Background Of "Production-Life-Ecology Space"

With land consolidation activities in the past two decades,the land use structure of Yulin City has undergone significant changes.While land use structure changes have caused significant changes in the surface structure,they have also directly affected the regional atmosphere,hydrology,soil and other cyclic processes,and even changed the overall structure and composition of the ecosystem.Therefore,scientific research and analysis of regional land use function evolution characteristics and its ecological environment repose can provide a basis for territorial planning,and promote regional high-quality development.Based on the 30 m resolution LUCC data sets of 30 m in five periods of 2000,2005,2010,2015,and 2018 and Landsat TM/OLI 30 m resolution remote sensing images in the summer of the same year.Firstly,use the transfer matrix and the center of gravity transfer model to analyze the spatiotemporal evolution characteristics of the land use function of the "production-life-ecology space" in Yulin City from 2000 to 2018.And then build the remote sensing ecological index model based on the Google Earth Engine and the geographic information processing platform to calculated the remote sensing ecological index.Where after,this article conducted a quantitative and qualitative analysis of the ecological environment quality from 2000 to 2018.Finally,on this basis,the ecological contribution rate was calculated,and the environmental response to the evolution of regional land use function was comprehensively analyzed.The results showed that:(1)The production and ecological functions have stabilized year by year,and life functions have increased year by year.(1)The area of production space in the "production-life-ecology space" has continued to decline and gradually stabilized,the area of living space has continued to grow,and the area of ecological space has changed from rising and then falling.(2)In terms of the spatial pattern of land use transfer,there are obvious differences between the six counties in the north and the south.The main production land and living land in the six counties are transferred to the district,and most of the ecological land transfer is located in the southern six counties.(3)From the perspective of the shift of the center of gravity,the overall center of gravity of the land for production space and ecological space has not changed much,and the center of gravity for living space has the largest transfer distance.During the study period,it migrated to the northeast year by year.(2)The overall quality of the ecological environment in Yulin City is developing well.(1)The average RSEI of the remote sensing ecological index is 0.486,0.499,0.501,0.520,0.525 in each year,and the increase rate from 2000 to 2018 is 8.02%.(2)From the perspective of the temporal and spatial distribution of ecological environment quality grades,the ecological quality grades are mainly medium and good in terms of time.The sum of the proportions of the two areas has exceeded 60% over the years,and the proportion of poor and medium areas has continued to decrease.In terms of space,regions with poor and poor grades are mostly concentrated in the six counties in the northern part of the study area with a faster urbanization rate,while areas with good and excellent grades expand from the southeast of the study area to the north year by year and are distributed in a north-south direction.(3)The slightly degraded areas from 2000 to 2010 accounted for 18.68%,and slightly degraded area from 2010 to 2018 was further reduced,accounting for only 8.08% of the area.(3)The evolution of different land use functions in the "production-life-ecology space" will lead to different ecological environment changes.slightly degraded area.(1)Grassland ecological land is converted to agricultural production land,and forest ecological land has a high positive contribution rate to the ecological environment,indicating that the development of comprehensive agricultural land consolidation and development,conversion of farmland to forests,and comprehensive management of soil erosion on sloping land have positive ecological effects.(2)The conversion of grassland ecological land to urban and rural living land also has a higher negative contribution rate to the ecological environment,indicating that the increase in urban and rural living land,which is dominated by impervious surfaces,will cause a decline in the quality of the ecological environment.The surface temperature of impervious surface tends to rise in summer,and the dryness increases,causing the "heat island effect" and so on.