
Evolutions and driving mechanisms of urban blue-green spaces in northeast China: a case study with the urban central district of Harbin City
SONG Shuang, SHI Mengxi, HU Shanshan, WANG Shaohan, XU Dawei
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (4) : 221-229.
Evolutions and driving mechanisms of urban blue-green spaces in northeast China: a case study with the urban central district of Harbin City
【Objective】 Blue-green spaces are constantly getting eroded as a result of urbanization. The study aimed to clarify the evolutionary characteristics of blue-green spaces and their driving mechanisms, which is highly significant for guiding urban land use planning and improving the quality of the ecological environment. 【Method】 With the central district of Harbin as the study area, time nodes based on five rounds of urban master planning during 1981-2020 were selected to explore the evolutionary characteristics of blue-green spaces. A spatial econometric model was then constructed to analyze its evolutionary driving mechanisms from the viewpoint of both socio-economic and natural factors. 【Result】 (1) The cultivated land, woodland, water and wetland areas in the study region decreased significantly, whereas the grassland area increased. The relevant land-use policies and urban planning schemes issued by the government were responsible for the evolution of blue-green spaces in the study area. (2) The total proportion of blue-green spaces exhibited a decreasing trend in all gradients, and the proportion of cultivated land, water, and wetland decreased significantly in the main urban area and the suburbs. The proportion of woodland in the urban center and at the periphery of the main construction land in the adjacent Songbei District decreased slightly. Grassland increased in the main urban area. (3) From 1981 to 2017, the blue-green space evolution model of the study area was dominated by endocytosis contraction in the main urban area. From 2017 to 2020, the outlying contraction had become the main evolutionary mode of blue-green spaces. The reduction in blue-green spaces had shifted from the internal units of the urban center building land to the periphery of the urban area. (4) The evolution of various blue-green spaces was driven by various factors. Socio-economic factors were the direct driving force, with the driving effect of natural factors not as obvious. 【Conclusion】 In this study, the spatial and temporal evolution characteristics of blue-green spaces in the central district of Harbin during 1981-2020 were identified, and a spatial econometric model was used to explore the different driving effects exerted by socio-economic and natural factors on the evolution of blue-green spaces. The study provides a reference for formulating a reasonable and scientific urban blue-green space development strategy during the rapid urban expansion in northeast China.
blue-green space / urban evolution / driving mechanism / spatial econometric model / Harbin City
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