| As an important indicator to evaluate urban green space service levels, accessibility of urban green space not only manifests the levels that residents approach to the green space, but also reflects the living environment quality of citizens. In urban green space landscape the patch number, patch area and rationality of spatial distribution directly affect the play of function of urban green space and the ecological environment of the city. So carrying out the research of accessibility and urban green space landscape spatial pattern, and analyzing the influence of urban green space landscape spatial pattern on accessibility, have important significance to improve the service level of urban green space and living environment quality of residents.Fuzhou main urban area that mainly contains Gulou District, Taijiang District, Cangshan District and Jinan District, is taken as the research object and Google Earth images in2010as the mainly basic data in this article. Based on the network analysis function of ArcGIS, using modified gravity mode and combining with the distribution of street population, accessibility of urban green space and citizen’s convenience of every administrative region and street of the study area in different travel modes.The urban green space is divided into five types according to the patch area:large plaque, large and medium-sized plaque, medium-sized plaque, middle-small plaque and small plaque. Landscape pattern indices which can represent the characteristics of landscape unit and landscape heterogeneity are selected as the targets to quantitative analysis urban green space landscape spatial pattern by using Fragstats3.3software, then investigate the urban green space landscape spatial pattern influence relation on accessibility.The main results were as follows:①Urban green space accessibility in study area is not high as a whole in non-motorized mode, and the area that can be arrived in10minutes of14.96percent.53.51percent of the residents need to take25minutes to get to the green space. It will improve in the motor vehicle model. Cumulative accessible area within10minutes increase to57.26percent.②Accessibility distribution of urban green space in the study area is unbalanced. The areas whose accessibility level is I or II are mainly distributed in the up of the north, the western and the southeast of the study area in non-motorized modes. The central and eastern of the study area, accessibility is generally low, and have a wide distribution. In non-motorized modes, the region whose accessibility level is II extended to the central region, and accessibility of the eastern edge is the worst.③In non-motor vehicle mode, the number of the streets in which the residents can arrive in15minutes is one, three in15～20minutes, fifteen in20～25minutes, other20are all over in25minutes. In motor vehicle mode, residents’ reachable time becomes shorter and convenience is improved. The number of streets where residents can arrive within10minutes raise to29. Residents in all streets can reach to the urban green space in15minutes.④In different travel modes, the orders of the travel convenience of the residents in each administrative region arrange from high to low as follows:Gulou District, Cangshan District, Taijiang District and Jinan District.⑤The urban green space landscape composition is uneven in the research area. The area of large plaque is far higher than other types of plaque, which takes up63.46percentages. Large green patches is the mainly type in the study area, the small and medium-sized green patches is complementary types and other green patches are supplement of urban green space landscape structure. Followed by the Gulou District, Jinan District, Taijiang District, the urban green patch in Cangshan District has the largest area which is1632.59hm2. The mean patch area of urban green space in Gulou District is6.66which is the largest patch. There are no large patches in Taijiang Distrsct.⑥In the study area the urban green space landscape dominance index is high, but the space distribution of urban green space landscape is uneven. The MPFD of various types of vegetation patches is generally low, which is between1～1.2; Evenness indices of Jinan District is highest,which is0.9721; Aggregation indices of Gulou District and Cangshan District are high, which are98.9982and98.9585respectively. Landscape connectivity of Taijiang District is lower than other areas, while the plaques fragmentation index is high.⑦Results of the influence of urban green space landscape spatial pattern on accessibility in study area show, the most impotant reason of uneven distribution of accessibility in the study area is uneven distribution of urban green space landscape;Because more area and number of the large patch in Gulou and Cangshan,which are attractive to people,making accessibility of Goulou and Cangshan are higher than Taijiang and Jinan.Above that if there are more urban green space plaques and the plaque areas are larger, then landscape spatial distributed more even, the attractiveness to urban residents was greater, and the accessibility of urban green space is higher. |
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