Study On Land Use Change And Ecological Vulnerability Of Urban Agglomeration In Fujian Delta

In recent decades,with the acceleration of urbanization and the continuous interference of human activities,the issue of ecological vulnerability has attracted much attention.Land use is the most direct manifestation of natural conditions and the disturbance of human activities,and ecological vulnerability is also undergoing profound changes under the interaction of the two.Studying regional land use change and its impact on ecological vulnerability can provide references for sustainable use of land resources and ecological protection and restoration.This paper takes the Fujian Delta urban agglomeration as the research area,and selects the land use data in 2000,2010 and 2020 to analyze the land use change in the study area.The index constructs an ecological vulnerability evaluation index system,and uses Arc GIS,Fragstats4.2,Geo Da,IDRISI and other software to explore the temporal and spatial evolution of ecological vulnerability,and the ecological vulnerability of various districts,counties and types.Finally,the MCE-CA-Markov model is used to evaluate the study area.The spatial pattern of land use in 2035 was simulated and predicted to analyze the relationship between changes in land use types and ecological vulnerability,and put forward corresponding suggestions.The results of the study are as follows:(1)The land use change is analyzed from both time and space.The results show that during 2000-2020,the land use types are mainly forest land and cultivated land,and the proportion of various land use types is quite different.From the perspective of the comprehensive dynamic degree of land use,the comprehensive dynamic degree of land use in the Fujian Delta urban agglomeration in 2000-2010,2010-2020,and 2000-2020 was 0.13%,0.34%,and 0.23%.From 2000 to 2020,the comprehensive index of land use degree in the study area was 244.6,246.34,and 250.65.The comprehensive index of land use degree showed an increasing trend,indicating that the impact of human economic activities on land resources was getting deeper and deeper.In the past 20 years,the total area of land use transfer in the Fujian Delta urban agglomeration is 4129.24 km ~2.The largest area of land transfer is cultivated land,and the main flow direction is the construction land with the largest area.(2)During the period of 2000-2020,the ecological vulnerability of most areas of the Fujian Delta urban agglomeration showed a trend of first increase and then decrease.The ecological environment gradually deteriorated during the period of 2000-2010,and the ecological vulnerability decreased during the period of 2010-2020.The study area The internal ecology tends to improve,and the trend of ecosystem enhancement is obvious.(3)From the perspective of the spatial distribution of ecological vulnerability,the ecological vulnerability of the Fujian Delta urban agglomeration has obvious zonal characteristics.The strong and extremely vulnerable areas in the study area are mainly distributed in the economically developed and industrialized southeast coastal areas.In areas with prominent manufacturing industries,the vulnerability level gradually decreases from the southeast coast to the northwest inland.In terms of different cities,the ecologically fragile areas are mainly concentrated in the southeastern coastal cities such as Shishi City,Jinjiang City,and the municipal districts of Xiamen,Zhangzhou and Quanzhou.(4)From 2000 to 2020,the ecological vulnerability of cities in the Fujian Delta has obvious spatial agglomeration characteristics,mainly high-high agglomeration and low-low agglomeration,and the spatial agglomeration changes are obvious during the period.The high-high agglomeration area is mainly distributed in the plains along the southeast coast,the low-low agglomeration area is mainly in the northwest inland area,and the high-low agglomeration area and the low-high agglomeration area are scattered throughout the study area with a small area.(5)The MCE-CA-Markov model is used to simulate and predict the land use change of the Fujian Delta urban agglomeration in 2035.The results show that the land use types of the Fujian Delta urban agglomeration in 2035 are still dominated by forest land and cultivated land.Although the area is increasing,its growth rate shows a trend of slowing down,and the reduction rate of cultivated land and grassland has also declined.From the perspective of spatial distribution,the areas where the area of construction land will increase in the future are mainly concentrated in Xiamen,Quanzhou,Zhangzhou,Shishi and Jin’an,which are relatively economically developed and rapidly developing along the southeast coast.The direction of change is mainly from southeast to southeast.Northwest Territories expand.