Construction Of The Greenway Network Of Urban Green Space System Based On Landscape Pattern

In recent years,Greenway network is the research focus and cutting-edge of many interdisciplinary, such as landscape ecology, urban planning and landscape design and so on. Greenway network is the further development and innovation of current green space system planning.While rapid expansion in the city, Greenway network has seized the construction and urban green space system and the integration of urban green space system,at the same time,it builds regional greenway network and guards against rapid urbanization and the destruction of resources.landscape fragmentation.It not only enriches the connotation of the traditional green space system planning,but also improves more functions about the green space system planning with its own advantage.This article has more comprehensive description of the concept of landscape pattern,green space system,greenway and greenway on the network at first,then reviews the development process of the greenway network, and analyzes foreign and domestic situation and planning greenway network, summarizes the greenway network planning methods and techniques, focuses on the use of landscape ecology and landscape pattern analysis on the construction of the greenway and the important role played by the network. Through a comprehensive understanding of greenway network, including the detailed introduction of its components, function,type and impact factors and the detailed introduction of landscape pattern analysis and landscape structure indices. What's more, this article elaborates greenway network used in the feasibility of urban green space system planning, which lets people have a deeper understanding of the greenway network.This article takes Zhongxian for example to have the planning practice for greenway network and build the urban greenway network in Zhongxian through having reference landscape patches and corridor and network structure analysis method.At first,during the analysis of landscape pattern, we selected patch number, patch type area, largest patch index, patch density, mean patch area, patch with the percentage of degree and six adjacent landscape indices to compare the green space and planning green status in Zhongxian,Chongqing. Through that, we found the increase the total area of green planning space, (The total area of patch types increased from 145.04hm2 to 413.3hm2), NP of Park Green and the total area of patch types increased, in this condition, largest patch index, average patch area, combined degree of patch and adjacent percentage all increased, which explained that green space system planning integrated the city of broken green in some degree in 2011, fragmentation levels of most broken green decreased,the condition got much better.In addition that the largest patch index decreased,other index has increased, it explained that the its fragmentation levels and broken green decreased. Because production green has fewer patch numbers, under the condition that patch number and the total area of patch type increased, other index decreased, which explained that the fragment levels increased and the broken green increased. From 2011 to 2020, urban green space system planning are still lack of the theory instruction of landscape ecology and the consideration of green ecological processes and network structure. It needs to build the greenway network in order to reach the optimization of green space system.Next,through the analysis of ecological nodes and ecological corridors of urban planning green space,this article builds four greenway networks,through the comparative analysis of corridor structure index and the network structure index, corridor structure used the following four indicators (ecological nodes, the number of ecological corridors, ecological corridor length and density of ecological corridors) to analyze,concluding that corridor levels of complexity of greenway networkⅢand networkⅣare the largest. The analysis of network structure adopted four index, central levelα, dotted line rateβ, network connectivityγand cost to analyze, we got that the index of central level aof greenway networkⅣis 0.306,which indicates that networkⅣhas the most circuit numbers.The index of dotted line rateβof networkⅣis the largest,1.571,which reflects that its degree of corridor connectivity is the largest.The index of network connectivity y of networkⅣis 0.541,it is the largest of four networks, which shows network connectivity is the strongest.The cost ratio of networkⅢis the lowest,0.038,which explains its builders and users are the most efficient.Through the comprehensive comparison of the corridor index and structure index, we can conclude that networkⅣis the optimization program of urban greenway network in Zhongxian, Chongqing.