Evolution and change of an urban greenspace: A case study on the outer ring of Shanghai

doi:10.3969/j.issn.1000-5641.2021.02.010

Abstract

Abstract:

Urban greenspace is an important part of the urban green system and urban landscape, with important ecological, social, psychological, and economic functions. The evolutionary trajectories and change patterns of urban greenspaces are of great significance to the sustainable development of urban green space systems and the optimization of the urban ecological network. There is ongoing emphasis on urban greenspace research; most previous research studies on greenspace changes have used landscape indices and spatial analysis methods, which struggle to accurately reflect the change process, change types, and spatial distribution patterns of greenspace. In our paper, seven types of greenspace evolution were defined, including continuous, expansion, contraction, dissipation, creation, merging, and splitting. Then, an evolution graph was constructed by defining greenspace patches as nodes and greenspace evolution relations as edges. Based on the greenspace evolution graph, the greenspace evolution process and its corresponding evolutionary trajectory were further extracted and visualized. Taking the Shanghai city center as a case study area, the spatial distribution pattern and change process of the urban greenspace for 2008, 2012, and 2016 were extracted. Results indicated that the most dominant greenspace evolution types were creation and dissipation. The newly added urban greenspace patches were more evenly distributed compared with those patches involved with an evolution type of dissipation. Small patches were more likely to be located in the urban center, while large patches tended to be concentrated in rural areas. The location of greenspace patches that disappeared were mostly concentrated in non-central areas, particularly in the Pudong New Area. Compared with the urban greenspace changes between 2008 and 2012, locations where new greenspace appeared between 2012 and 2016 were more evenly distributed, while locations where greenspace disappeared were more concentrated.

Key words: urban greenspace, types of evolution, evolutionary graph/evolution track, greenspace change

CLC Number:

K909

Qiong WANG, Bin WU, Shenjun YAO, Jianping WU, Ying ZHOU, Jing ZHANG. Evolution and change of an urban greenspace: A case study on the outer ring of Shanghai[J]. Journal of East China Normal University(Natural Science), 2021, 2021(2): 100-109.

Figures/Tables 10

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编号	演化类型	含义
1	连续	绿地斑块没有发生变化
2	扩张	绿地斑块面积增加
3	收缩	绿地斑块面积减少
4	消失	绿地斑块不再存在
5	新增	新增一个绿地斑块
6	合并	2 个或多个绿地斑块合并为一个绿地斑块
7	分解	一个绿地斑块分解为 2 个或多个绿地斑块

年份	扩张	新增	收缩	合并	分解	消失
2008—2012年	6682(1.7%)	81026(20.7%)	11406(2.9%)	978(0.2%)	1493(0.4%)	54085(13.8%)
2012—2016年	6297(1.5%)	59653(14.2%)	10556(2.5%)	1295(0.3%)	1935(0.5%)	44806(10.7%)

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