Construction And Optimization Of Urban Green Space Ecological Network In Zhengzhou

With the continuous expansion of the city,a large amount of natural space is occupied,and the construction land occupies the ecological space in the city to varying degrees,resulting in the intensified fragmentation of the urban ecological patch,thus affecting the ecological service function of the city.The construction of the ecological network is of great significance to the urban ecological construction.The construction of a perfect urban green space ecological network can increase the connectivity of urban green space,improve the urban ecological spatial pattern,improve the stability of the urban ecosystem,and promote the ecological efficiency of the green space system.to guide the rational development of urban space.This paper selects the enclosed area of Zhengzhou City Ring Expressway as the study area,uses the landscape index with different ecological significance to analyze the landscape pattern of the study area,adopts the morphological spatial pattern analysis method and the circuit model to construct the green space ecological network in the study area and conducts a comprehensive analysis.Evaluation,and finally put forward optimization suggestions,the main research results are as follows:（1）The urban land is divided into 6 categories of urban green space,road,other construction land,water area,farmland,and other land（bare land and unused land）,on this basis,the landscape pattern analysis is carried out.The distribution of various types of landscapes in the city is relatively uniform,there is no landscape type with a high degree of dominance,and the overall urban landscape is broken and the structure is complex.Among them,the overall number of urban green space is relatively small,the degree of landscape fragmentation is the largest,the distribution of green space is relatively scattered and the patch area is small,the interference of human activities is relatively serious,and the shape of green space patches is relatively regular.（2）The morphological spatial pattern analysis model and the least-cost path model were used to construct the green space ecological network in the study area,and 37 ecological sources were extracted.The ecological sources are mainly distributed in the areas near Longhu Lake,Jiangang Reservoir and the Southto-North Water Transfer River.The urban center has a high degree of development and construction,and there is a large area of ecological sources in the middle blank space.There are a total of 58 simulated ecological corridors,mainly distributed in the area along the river.The central ecological corridor connects the east and west of the study area.But the corridor is too long,it is more fragile and prone to fractures.The structure of the ecological corridor connecting the north and the south in the east and west is relatively simple.Generally speaking,the distribution of ecological corridors in the study area is uneven,and there are many corridors that are too long and too short,and the connectivity is poor,which needs to be optimized.（3）The Linkage Mapper plug-in is used to analyze the centrality of the constructed ecological network and identify ecological pinch points.In view of the uneven distribution of green space in the study area,9 new ecological sources were added,6 important ecological sources were identified,a total of 19 stepping stone patches were set up in the areas with high biological circulation in the ecological network,and a new planned ecological corridors were added 20 items,60 ecological breakpoints were identified,and put forward optimization suggestions such as optimizing the water environment and improving the plant community structure,so that the distribution of ecological sources in the study area was more uniform,and the overall connectivity of the green space ecological network has been improved.