| With the accelerated process of urbanization,the urban green space network,One of the effective solutions to alleviate the environmental problems brought by the urbanization,has gradually gained attention from the society and scholars.As one of the typical mountain cities in the southwest China,Kunming is reducing the area of urban greening,and the diversity of urban species and the stability of urban green ecosystem decrease with the decreasing area of urban expansion.The construction of suburban green space network can increase the diversity of urban species by increasing the efficiency of information exchange and migration of suburban species,thus increasing the stability of urban ecological network,and has a positive effect on the stability of urban green ecosystem.This paper mainly has two research parts:(1)Analysis of the suburban green space type and the landscape pattern of the Kunming city;The simulation of suburb green space network of Kunming city;based on the index of the network characteristic evaluation index,the beta index,the gamma index and the cost Cr index,the network characteristics of the mountain cities and the non mountain cities were analyzed.(2)from the aspects of land use type,green space type,green landscape pattern,green space species composition and so on,it analyses the urban differences of Chenggong new area under the planning of the intensive development of the main city and the"new city concept",and selects the green patches of high connectivity as the network node to simulate the green space network of the two research area.In the field,the species diversity and invasive species diversity are investigated in the field,and the correlation analysis of the location in the green space network was carried out respectively.The correlation analysis results are used to verify the feasibility of the green space network.The results of the study show that:(1)The Greenland Landscape in Kunming research area is dominated by woodland,with an area of 429.48 km~2,which accounts for 53.64%of the total green space.It is mainly distributed in the suburbs of the city.It has the characteristics of large patch area and low fragmentation,and the green patches in the center of the city are characterized by small area and high fragmentation.(2)The urban green space network in the suburbs of Kunming is mainly distributed in the suburban green space ecosystem.The small patches of green space in the city center and the small area occupation ratio are the main reasons that obstruct the information exchange and migration of the suburban species.(3)Compared with other relatively gentle green space network structure,the mountain city network is characterized by the unique distribution characteristics of urban green space,which leads to the small number of green network nodes and corridors,simple network structure and high network construction cost.(4)The types of green space in Chenggong research area are rich,the area is uniform and the fragmentation is low,but the landscape types in the main city are few,and each kind of landscape type has the characteristics of high fragmentation and low landscape connectivity,and the new Chenggong new area is superior to the main City in the area of green space,area and number of patches and species of green space in Chenggong are all better than those in the main city.(5)The distribution of Chenggong sample sites in green space network is significantly related to species diversity and invasive species abundance.The diversity of species and the diversity of invasive species in Chenggong green space are satisfied:node Greenland>corridor green space>distance corridor 450m green space>distance corridor 450 meters away,but this result is not significant in the main city.(6)The simulated Chenggong green space network can improve the species diversity and intrusion species diversity of urban green space.The rational use of the network has a certain reference value to improve the diversity of urban species and control the transmission of invasion. |
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