| As the main component of urban ecosystem,urban green space is one of the important indicators of urban environmental quality,and the planning and construction of urban green space is an important link to realize the construction of the national ecological garden city in Taiyuan City.The rapid urbanization process has seriously affected the function of urban green space system.This study analyzes remote sensing images of the current situation of urban ecological space and urban garden green space in Taiyuan City,combined with ground sampling,and takes the relevant principles of ecology and landscape ecology as the,and quantitatively analyzes the urban ecological space sensitivity,green space landscape structure and distribution pattern.A further study of 35 different types of urban green space was carried out to analyze the plant species composition and plant application characteristics and diversity of different types of garden green space.Based on the study of ecological spatial sensitivity,landscape pattern of garden green space and plant,it puts forward some suggestions for constructing the urban green space landscape with high ecosystem stability,reasonable structure and layout and abundant plant species diversity.The main findings are as follows:(1)The proportion of ecologically insensitive areas within the planning area of Taiyuan City is relatively large,mainly distributed in towns and surrounding areas,the east and west mountains and the northern Yangqu County are more sensitive,and the ecological space sensitivity is gradually decreasing from the outer perimeter of the city to the central urban area.The total insensitive areas,low-sensitive areas,moderately sensitive and highly sensitive areas of the planning area accounted for 35.19 percent,25.75 percent,23.25 percent and15.81 percent of the total area of the planning area respectively.Water environmental factors have the strongest influence on sensitivity,followed by the influence of vegetation factors,in which vegetation spatial distribution,vegetation type,growth status and community composition structure all affect vegetation coverage sensitivity,therefore,it is suggested that improving the water environment,optimizing the spatial layout of green space and plant community structure as the focus of ecological protection and planning,can further strengthen the overall degree of ecological space anti-jamming.(2)The total area of garden green space in the central city of Taiyuan is 12026.5hm2,accounting for 33.5%of the total land area of the planning area.The whole central urban area to small green space landscape mainly,large-scale patches as a supplement,large and medium-sized landscape plaques are relatively lacking.The number and area of protective green space have the highest proportion,followed by the secondary green space.The number of green space in the park is scattered,and the landscape of green space is mainly large and medium-sized.Most of the square land greening coverage rate of 35%,can not meet the green requirements of the square green space.(3)In terms of the degree of fragmentation of green space landscape,the analysis of green space in different areas can be seen that the breakage of old urban areas such as Wan Berlin District,Almond Flower Ridge District,Yingze District and Small Shop District is higher than that of the new urban area,and the longer the construction time,the higher the degree of fragmentation of its green space.The analysis of different types of green space can be seen that the density of the protective green space and the attached green space has the highest density,the two in a certain area of the large number of plaques,high degree of fragmentation.The density of plaques in the park green space is relatively low,showing a slight degree of fragmentation.The green patch density of the square is the lowest,and the landscape connectivity is poor.In terms of landscape diversity of green space,the landscape diversity of urban landscape green space in Taiyuan City is generally low,the area of landscape types of various types of green space is unevenly distributed,and the richness of landscape types is poor,which is not conducive to the survival and continuation of species and the stability of the ecosystem.The wan Berlin area has the highest diversity index(1.24),the lowest in the apricot area(1.13),and the difference between the regions indicates that the landscape types are more balanced.The uniformity of landscape types reflects the same trend,and the higher the uniformity index,the more balanced the distribution of green space.(4)A total of 297 plant species were recorded in the garden green space of the central city.Plant species are more concentrated,the number of species greater than 10 of the sections have 8,the number of sections distribution only 10.69%of the total number of species,but the number of species has 140 species,accounting for 47.14%of the total number of species;Through the analysis of ornamental characteristics,it can be seen that the total number of plants with different ornamental characteristics is plant-watching plants,leaf-viewing plants,view-to-fruit plants,and dried plants,and edible plants.(5)Analysis of the plant diversity characteristics of different types of garden green space,park green space plant species up to 289 kinds,79 kinds of protective green space,82 kinds of square green space,113 kinds of ancillary green space,Rose,Willow,bean,wood rhinoceros contains the most species.In different types of urban garden green space round cypress,national cypress is the highest frequency of trees,shrubs appear the highest frequency is the large-leaf yellow poplar and purple leaf small jaundice.Through the analysis of the garden plant diversity index,it is found that Taiyuan Park Green Space,Protected Green Space Plant Richness Index Tree Layer and Herb Layer,Subsidiary Green Field Plant Richness Index Tree Layer,Shrub Layer,Square Green Area Plant Richness Index Shrub Layer and Herb Layer.Park green space,protective green space,attached green space plant diversity index tree layer,shrub layer,square green area plant diversity index shrub layer...tree layer.The species uniformity index of park green space,protective green space,square green space and ancillary green space are all tree layers and shrubs.Based on the above several parts of the study,the optimization strategy of landscape pattern and plant diversity in the garden green space in the central urban area of Taiyuan city is put forward,with a view to providing theoretical basis for the development and construction of urban greening.Strengthening the proportion of large and medium-sized green space patches,building additional units and residential green space,and constructing ecological corridors along the river belt park are all conducive to strengthening the connection between plaques to reduce landscape fragmentation,thus optimizing the block structure.In the optimization of garden plant diversity,this paper puts forward the targeted optimization strategy from the aspects of native plants,habitat plants,honey-source plants,waterfront plants,three-dimensional green plants,color-added green plants and different types of urban garden green space plant species and community patterns. |
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