Research On The Response Of Ecosystem Service Value To Land Use Change In Guangzhou

Ecosystem is the basis for measuring the function of regional ecosystem and is an important bearing factor for social and economic development and human activities,while land use change is a relationship with ecosystem service function change showing mutual influence and constraint.Based on the remote sensing data of land use,this thesis constructs a dynamic assessment model of the ecosystem service value of Guangzhou city with the city as the study area,applies the revised model to assess the ecosystem service value of Guangzhou city from 2000 to 2020,and realizes the spatial analysis of the study area with the help of GIS and Geoda and other software.The correlation between land use change and ecosystem service value was analyzed by using linear regression and variance contribution rate,and the influence of land use change on ecosystem service value was investigated.The main conclusions are as follows:(1)The spatial and temporal divergence of land use in Guangzhou from 2000 to 2020 is more obvious.During the study period,except for construction land and water area,the area of all other land types showed different degrees of decline.There are significant regional differences in land use type conversion,among which construction land changes significantly faster than other land uses,and arable land,forest land and unused land are the main sources of their increase.(2)The total value of ecosystem services in Guangzhou decreased from RMB 55.737 billion to RMB 50.380 billion during 2000-2020,a total decrease of RMB 5.357 billion in 20 years.In terms of the contribution of ecosystem service values of the six major land categories,forest land has the largest contribution value and the largest change.In terms of the contribution of individual ecosystem services,two services,hydrological regulation and climate regulation,have the highest contribution and fluctuate widely.From the spatial distribution of ecosystem service values,the distribution pattern is generally "low in the middle and high in the surroundings".The spatial distribution of the high value of each ecosystem service varies,while the low value is mostly concentrated in the central part of Guangzhou,and tends to expand further over time.The Morans ’I’ value of the value of ecosystem services per unit area in Guangzhou was always above 0.45 during the study period,and continued to increase.The "high-high" aggregation and "low-low" aggregation were dominant among the administrative regions,and the number of "high-high" and "lowlow" aggregation patterns increased during the study period.The number of "high-high" and"low-low" clustering patterns showed an increasing trend during the study period,and their spatial clustering phenomenon increased year by year.(3)The main reasons for the change in the value of ecosystem services are the conversion of land use types and regional differences.Through the analysis of the variable contribution rate,it can be seen that the contribution rate of the ecosystem service value of construction land and water area is the largest,which is the main land use type affecting the value of ecosystem services in the study area,followed by arable land and forest land,and the unused land has the smallest impact on the value of ecosystem services.Through correlation analysis,it can be seen that the degree of land use and the value of ecosystem services in Guangzhou are negatively correlated,and the deepening of land use degree is the main reason for the decline in the value of ecosystem services,which is mainly manifested in supply services and regulatory services.Secondly,the degree of land ecological coordination in Guangzhou has changed from slight conflict to slight coordination,indicating that in the early stage of the study,the land utilization rate was higher than the growth of the value of ecosystem services,and the land use change caused the deterioration of the ecological environment;in the later stage of the study,the land use speed slowed down,which began to have a positive effect on the ecology.Finally,the grey prediction model is used to predict the value of land use change and ecosystem services in Guangzhou from 2025 to 2030,and the value of ecosystem services in Guangzhou is still decreasing during the forecast period.According to the research conclusions,this paper provides suggestions for the rational optimization of the land use structure in Guangzhou from four aspects:consolidating the layout of benign ecological land,optimizing the distribution of ecological value,improving the ecological value of cultivated land and improving the quality of regional urbanization.According to the research conclusions,this thesis provides suggestions for the rational optimization of the land use structure in Guangzhou from four aspects:consolidating the layout of benign ecological land,optimizing the distribution of ecological value,improving the ecological value of cultivated land and improving the quality of regional urbanization.