Study On Land Use Change And Its Influence On Ecological Network Pattern In Tianjin

In recent years,with the rapid development of China's economy and the continuous improvement of urbanization level,land resource,as a limited natural resource,is an important carrier of urban development.Affected by the needs of human survival and development,regional ecological environment conditions affect the way of human utilization of land resources.Similarly,the change of land use mode also promotes the change of regional ecological environment.With the need of sustainable development,people's understanding of the role of good ecological environment in social development has been strengthened,which puts forward higher requirements for the rational use of urban land resources.Changes in the rapid development of urban land,the urban land use evolution process and its inner mechanism,understanding caused by way of land use change,the change of the regional ecological environment,to construct a reasonable urban ecological network pattern,the reasonable use and management of urban land resources,improve the regional ecological environment,and promote regional harmonious green development is of great significance.Based on Landsat remote sensing image data,this paper interpreted and obtained the land use data of Tianjin in 1999,2009 and 2019.It analyzed the development and evolution process of land use in Tianjin by combining the analysis method of land use quantity structure and spatial change and landscape pattern index analysis method.On this basis,combining with the Tianjin natural elements such as elevation,slope,river layout and traffic layout,the economic and social and economic factors,such as population data influence the driving factors of land use space change in Tianjin is analyzed,and the under the old trend in the development of Tianjin in 2029 to simulate the land use spatial layout;Based on the simulation results,the InVEST habitat quality model was used to analyze the ecological environment impact caused by land use change,and on this basis,the ecological source was selected to identify the ecological corridor,construct the ecological network space pattern of Tianjin,and put forward relevant Suggestions for the future utilization of land resources in Tianjin.The results show that:(1)Significant land use change in Tianjin.From 1999 to 2019,the area of cultivated land and water area in Tianjin continued to decrease,while the area of construction land and other land continued to increase.The area of woodland and grassland fluctuated during the study period,and the area first decreased and then increased.Under the influence of urban development,cultivated land and water area continuously flowed into construction land and other land.With the continuous improvement of the overall urbanization level of the research area,the expansion of urban construction land has resulted in the gradual segmentation of large areas of the original patches,resulting in the overall fragmented landscape pattern of Tianjin,the landscape layout tends to be decentralized,the dominant landscape role has been weakened,andthe landscape diversity has been further increased.(2)Economic development and population growth lead to the rapid expansion of construction land.Natural driving factors have a significant impact on the spatial distribution of cultivated land,water area,woodland and grassland.Construction land and other land play a significant role in the spatial attraction of road traffic layout and mainly gather on both sides of traffic lines.Combined with the spatial simulation results of Tianjin's land use in 2029 under the natural development conditions,it can be seen that the ecological land such as forest land and grassland continues to concentrate in the northern mountainous areas of Tianjin,and its land area continues to increase.Affected by urban expansion,the cultivated land area is further reduced;Construction land continues to extend to the southeast of the city.(3)The article on the basis of the ecological environmental quality analysis and evaluation of Tianjin,to the original nature reserve as ecological source,combining with the ecosystem service function evaluation results ecological node selection,through the present situation of land use landscape basic consumer resistance to build Tianjin surface to simulate the potential ecological corridor,eventually constructed by 10 ecological source,13 nodes,33 Tianjin ecological network structure composed of ecological corridors.