Research On The Optimization Of The Spatial Pattern Of Ecological Construction Of Dalian Based On GIS/RS Technology

China's economy has developed rapidly in recent years,at the same time,ecological security issues have become increasingly prominent,affecting the sustainable development of human society seriously.The ecological spatial pattern is inseparable from human well-being,national development and environmental security.With the transformation of the main social contradictions,the demand of human is getting higher and higher on the ecological environment,and their expectations and ideas for solving ecological problems have become stronger comprehensively.Therefore,ensuring ecological security and optimizing the ecological spatial pattern has become an urgent social need in China.According to current research theories and research status,it is known that ecological barriers and corridors are shaped and constructed as the foundation of ecological environmental protection,and most of the existing research methods for the optimization of ecological spatial patterns are mostly through visual interpretation,etc.The approximate locations of barriers,ecological corridors and ecological nodes cannot be accurately divided.Therefore,this article takes Dalian as the research object,further explores the optimization model of ecological spatial pattern,rationally arranges each ecological area,and makes overall planning.The research on Dalian includes Dalian's land area and coastal area,and a total of 53,131 kilometers of 500m*500m grids have been defined as evaluation units;combined with the current status of Dalian's ecological environment,multiple indicators are selected,using multi-criteria evaluation and buffer zones Technical methods such as analysis and superposition analysis define the ecological construction space in Dalian.The results of the research show that the ecological construction space of Dalian is mainly distributed in the northern land ecologically fragile area and the eastern and western coastal areas.According to the natural breakpoint method and the equal division method,the ecological construction space division plan is obtained.The area of ecological construction space divided by natural breakpoint method and equidistance method is 2206.5km~2and2193.25km~2 respectively.Based on the currently divided ecological spatial pattern,we recommend the ideal ecological construction spatial pattern optimization plan.A total of 27ecological barriers are delineated,with a total area of 6062.75km~2;a total of 28 ecological corridors;a total of 27 ecological nodes,including nature reserves.There are 7 nodes,12forest park type nodes,and 8 water source protection zone type nodes.Among them,the ideal terrestrial ecological construction spatial pattern includes 2 territorial ecological barriers and11 watershed ecological corridors;facing the coastal area ecological construction spatial pattern,the recommended plan includes 25 coastal ecological barriers and river ecological corridors 17 ways.This paper uses qualitative and quantitative technical methods to calculate the results of various division schemes,and finally puts forward a recommended scheme for optimization of the spatial pattern of ecological construction.Compared with the previous visual interpretation of the division method,the cost is lower and the division is more accurate.The innovation of this article is to put forward the concept of ecological construction space,comprehensively use a variety of analysis tools in technical methods,and on this basis,use quantitative and qualitative technical methods to propose a reasonable basic plan for ecological construction space pattern optimization.The empirical value of this article lies in that it can provide theoretical basis for Dalian's future development planning,national land spatial planning,ecological environment planning,etc.,and provide a basis for subsequent related research.