| Urban park is an important part of urban system.It can provide abundant social and cultural services and ecological services and play an important role in improving the well-being of residents.Strengthening and improving the planning and management of green space are urgent tasks for building livable cities in China.In this way,this paper chooses 287 cities at prefecture level or above(simply as ‘sample cities’)as demonstrations,and takes green space as the research object to measure the spatial patterns and social service values of urban green space in China based on spatial data and statistical data through GIS technology.The spatial pattern of urban green space This paper analyses from the following four aspects,the coverage rate of green space,average patch area,the per capita area of green space,and compactness degree.From 2012 to 2017,the average coverage rate of green space in the sample cities increase.Among them,in the municipalities,the new street greenbelts in the new construction land area are the main increasing types,and in the provincial capitals and sub-provincial cities,larger park greenspace were added in the old urban areas,and the change rates of park greenspace in different prefecture-level cities is polarized significantly.The average patch area increased and caused by the adjustment of administrative divisions and greening policies,the gap of average patch area in different types of cities is widening.The per capita area increased.When regards to the change rate of average area,this rate was the highest in prefecturelevel cities,whereas lowest in the municipalities.The compactness decreased.The highest average change rate of compactness among all city types is in prefecture-level cities,and the lowest is in sub-provincial citie.The values of social service in urban park greenspace This paper evaluates the service-area ratio of green space,the density of users and the average emotion value of users.From 2012 to 2017,the average service-area ratio of urban park greenspace increased.The service-area ratio of 27% cities in the sample cities decreased.Compared with 2012,this indicator among the sample cities in 2017 tends to be more balanced.The density of users increased.There were 34% cities had decreased density of users but 66% cities had increased density of users.In general,compared with 2012,the density of users in sample cities increased in 2017,but there was also a more serious polarization phenomenon.The average emotion value of users increased.Among them,the average emotional value in 57% cities increased.The factors which caused negative emotions of park green users were garbage,dancing disturbing people in park greenspace.The factors including beautiful environment,convenient transportation could create positive impact on emotional values.The comprehensive analysis of spatial pattern and the values of social service in urban park greenspace This paper explores the influencing factors and the relationship between spatial pattern and the values of social service in urban park greenspace.The result shows that there is a significant correlation between spatial pattern and the change of social service value,which can promote the improvement of social service value of urban park greenspace by improving the spatial pattern of park green space coverage and compactness.At present,China is in the critical period of implementing the new urbanization strategies.For many cities,the air pollution is aggravating and the quality of human settlements is declining.The results of this study can provide scientific basis for improving the planning and management of urban park greenspace.Horizontal comparison of park greenspace and its dynamic changes in different levels of cities can guide the improvement of social service value of park greenspace,then contribute to the construction of new urbanization. |
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