Study On The Construction Of Ecological Security Pattern In Jinmahe River Basin And Landscape Planning Strategy In Wenjiang Section

Against the backdrop of rapid economic development in China in the past few decades,cities have rapidly expanded and continuously eroded the protection range of ecological red lines,and the ecosystem is facing enormous pressure.Therefore,traditional landscape design methods can no longer solve the contradiction between urban development and ecological protection.How to achieve coordinated development between cities and ecology from a new landscape perspective is an urgent problem.The "West Control" policy was proposed by Chengdu in 2017 and is an important part of gradually optimizing the future spatial development of Chengdu.Its main purpose is to enhance the ecological function of the western region,strengthen the urban ecological foundation,and achieve the sustainable development of Chengdu in the future.Now,with the continuous promotion of the "West Control" policy strategy,as an important water conservation area in the west of Chengdu Plain,the ecological status of Jinma River is becoming more and more prominent.Therefore,first of all,this article takes the Jinma River Basin as the main research object,analyzes the changes in the land use map of the basin in the past 20 years,and deduces that urbanization is an important factor affecting ecological changes in the river basin.Furthermore,relevant data was obtained through onsite research,literature review,and geospatial information websites,and the ecological security pattern of the Jinma River Basin was constructed.Finally,based on this result,ecological planning strategies and corresponding landscape design schemes were proposed for the Wenjiang section of the Jinma River Basin,with the aim of assisting future urban construction.The main research conclusions and achievements of this article are as follows;(1)Comparing the land use map of the Jinma River Basin over the past 20 years,it was found that the construction land and water source area increased in 2020 compared to 2000.The increase in construction land is the most significant,five times the original.On the contrary,the areas of forest land,grassland,and cultivated land have all decreased.(2)Based on digital elevation models(DEM data),rainfall,lighting and other data,the ecological sensitivity assessment and comprehensive water security pattern,geological disaster and soil erosion prevention and control security pattern,biodiversity protection security pattern,and cultural landscape protection security pattern of the Jinma River Basin were constructed.Finally,the comprehensive ecological security pattern of the Jinma River Basin was obtained by weighted superposition.(3)Based on the results of ecological security pattern,landscape ecology planning strategies are proposed for water environment protection,waterfront landscape,water and soil conservation,species diversity protection,and landscape recreation in Wenjiang section of the Jinma River basin.Guided by the comprehensive ecological security pattern of the Jinma River basin,the ecological protection red line for the development of Wenjiang section of the Jinma River was defined,and the construction forbidden zone,construction restricted zone,and construction suitable zone were demarcated.Suggestions were made for the overall ecological construction and landscape planning of the region in the future.Based on the results of the ecological security pattern of the Jinma River basin,this study analyzed and determined the direction of landscape planning in the basin.By changing the scale from macro to micro,a shift from theoretical analysis to strategy has been achieved.The ultimate goal is to achieve ecological protection of urban water source space and landscape optimization of urban waterfront space,laying the foundation for the smooth implementation of the "West Control" policy.