Relationship Between Road Density And Land Use、Landscape Pattern And Ecological Risk In Wuhan City

Urban road is an important infrastructure for the social and economic development of the city and the living of the residents.Urban road density,as an important index to measure the status of urban road construction in a region,can reflect the overall road construction status and the difference of road construction status between regions.Understanding the influence patterns of road density on land use,landscape pattern and ecological risk is of great importance for urban development planning and land consolidation.This paper mainly adopts several spatial correlation analysis methods,like the space syntax,kernel density,spatial correlation analysis;and a few of comprehensive index,like land use degree,landscape pattern index and ecological risk index model.Analyzing the land utilization,landscape pattern and ecological risk of different road density area on 2000 and 2015 in Wuhan city,the main conclusions are as follows showed:(1)The main land use types in Wuhan were construction land,cultivated land,water area and woodland.There was little change in water and woodland from 2000 to 2015.The main land use change was the decrease of cultivated land and the increase of construction land.In different years,with the increasing of road density,the proportion of construction land increased gradually,and the proportion of cultivated land decreased gradually.The comprehensive index of land use degree increased linearly.(2)Through the analysis of a series of landscape pattern index in different road density areas,we find that the landscape pattern index of different road density areas in Wuhan is greatly influenced by the density of regional roads.With the increasing of road density,the aggregation degree of construction land in Wuhan increased gradually,and the degree of cultivated land aggregation decreased gradually.The degree of fragmentation and equilibrium of the whole landscape showed a trend of first increase and then decrease.(3)In 2000 and 2015,the ecological risk index in different road density areas in Wuhan was relatively low,which was below 0.18,indicating that Wuhan had a better overall ecological environment and lower ecological risk.Analyzing the ecological risk index between corresponding road density area in different years in Wuhan city,we can see that:the ecological risk index of different road density areas in 2015 was below the overall ecological risk index in 2000 the corresponding road density area,and the turning point of ecological risk index decreased with lower road density.This suggests that Wuhan has made remarkable achievements in ecological protection.In this paper,through the analysis of the influence of road density on land utilization,landscape pattern and ecological risk,we can understand the variation trend of land use,landscape pattern and ecological risk with road density changes,and provide a theoretical basis for urban planning,land remediation and ecological protection in Wuhan city.