Construction And Optimization Of Green Space Ecological Network In Urban Fringe

The rapid development of cities in China has caused the continuous expansion of construction land,resulting in more and more fragmented landscape patches of urban green space,which has a negative impact on the ecological function of the whole city.The ecological system function of urban green space is closely related to urban landscape,and the construction of landscape pattern is very important for urban ecological construction.In the process of urbanization,the urban center expands outward,and the urban fringe area between the city and the suburban villages and towns becomes an active development area in the process of urbanization.Because of its specific geographical location,the urban fringe area has provided many conveniences for the development of urbanization,but it has also destroyed the ecological function and brought about environmental pollution and other problems.The construction of green space in urban fringe can effectively alleviate these problems.Taking the urban fringe of Tongzhou District of Beijing as the research area,this paper analyzed the landscape pattern of green space in the study area,constructed the ecological network of green space in the study area,and optimized it.The following conclusions were drawn:(1)The study was divided into five categories:urban green space,cultivated land,construction land,water area and other land use.Among them,urban green space was divided into five types:park green space,protective green space,square land,subsidiary green space and regional green space.The landscape pattern of green space was analyzed by index.The green space resources in the study area are abundant,but the spatial distribution of green space was not uniform.Most of them are concentrated in the west,southeast and northeast of the study area.Most of the green space patches were small and fragmented seriously,(2)Important core patches were extracted by MSPA.Based on the relative importance evaluation of ecological connectivity,the ecological sources of the study area were selected,and then the potential ecological corridors between the ecological sources were extracted by the minimum cost distance model method,and the green space ecological network of the study area was constructed.Potential green space ecological corridor tends to be linear distribution,single structure,and can not cover the study area in an all-round way.Potential green space ecological network in the study area mainly concentrated in the northeastern region,and its spatial distribution was extremely uneven,which was difficult to cover the whole study area,and was not conducive to the ecological construction of the study area.(3)The optimization of green space ecological network in the study area.Aiming at the problems of uneven spatial distribution of green space and serious fragmentation of green space patches in the study area,some optimization measures were taken to increase secondary ecological sources,ecological restoration points,road corridors and water system corridors.The optimized ecological network of green space in the study area had more abundant structure,more reasonable spatial distribution of ecological sources,and covered the study area evenly and comprehensively.