Influence and mechanism of "Turning Counties (Cities) into Districts" on urban space expansion:Taking Hangzhou as a case study
Received date: 2018-08-17
Request revised date: 2018-10-30
Online published: 2019-02-20
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The continuous promotion of urbanization has created new demands for urban spatial expansion. "Turning counties (cities) into districts" has been one of the main means to enlarge urban area and optimize structure of large cities in China. Taking Hangzhou as an example, this paper quantifies the spatial-temporal characteristics of urban spatial expansion after "Turning counties (cities) into districts", and discusses the mechanism of this administrative division adjustment on urban spatial expansion. The results show that "Turning counties (cities) into districts" has positive effect on urban expansion in Hangzhou. The urban construction land in Hangzhou has been expanding continuously since 2000, especially after "Turning counties (cities) into districts", the trend of eastward expansion of construction land in Hangzhou is more obvious. Specifically speaking, on the one hand, the expansion rate of construction land in Xiaoshan and Yuhang is higher than the average level. On the other hand, construction land in Hangzhou is concentrated in the multi-center of space, the "Core-Periphery" characteristic of construction land in the whole city is weakened. The new construction land is mainly concentrated in the eastern part of the city. Xiaoshan and Yuhang become the new high-density areas for construction land expansion after "Turning counties (cities) into districts", and urban functions continue to be highlighted in these two municipal districts. "Turning counties (cities) into districts" should be regarded as an important driving force for urban expansion, but not the only one. According to the theory of scale and boundary, "Turning counties (cities) into districts" has indirect effects on urban expansion, which requires the following routes: urban planning and revision, adjustment of land properties and privilege, spatial reorganization of production factors. The joint action of all factors affects the urban spatial expansion and spatial evolution, and then affects the evolution of regional structure. It is a comprehensive research topic to study the influence and mechanism of "Turning counties (cities) into districts" on urban space expansion. This paper focuses on the spatial and temporal changes of construction land in new districts before and after "Turning counties (cities) into districts", and explores the interrelationship between "Turning counties (cities) into districts" and other driving forces. This is a necessary prerequisite for the adjustment of administrative divisions, and can provide reference for the future adjustment of urban administrative divisions.
CHEN Yufan , WANG Kaiyong . Influence and mechanism of "Turning Counties (Cities) into Districts" on urban space expansion:Taking Hangzhou as a case study[J]. GEOGRAPHICAL RESEARCH, 2019 , 38(2) : 221 -234 . DOI: 10.11821/dlyj020180870
Tab. 1 Spatial areal coordinates and migration rateof construction land in Hangzhou in 1990-2015表1 1990-2015年杭州城区建设用地空间重心坐标及迁移速率 |
| 年份 | X坐标 | Y坐标 | 迁移速率(m/a) |
|---|---|---|---|
| 1990 | 120°11′49″E | 30°16′19″N | - |
| 2000 | 120°12′15″E | 30°16′11″N | 70.94 |
| 2005 | 120°12′49″E | 30°15′56″N | 204.17 |
| 2010 | 120°12′54″E | 30°16′03″N | 48.80 |
| 2015 | 120°12′57″E | 30°16′03″N | 16.73 |
Fig. 1 Quadrant azimuth map of construction land in the study area in 1990-2015图1 1990-2015年研究区建设用地象限方位分布 |
Fig. 2 Space compactness index of construction land in Hangzhou in 1990-2015图2 1990-2015年杭州建成区空间紧凑度指数 |
Fig. 3 Spatial density distribution of construction land in Hangzhou in 1990-2015图3 1990-2015年杭州建设用地扩展空间密度分布 |
Tab. 2 Moran's I of expansion for construction landin Hangzhou in 1990-2015表2 1990-2015年杭州市区建设用地扩展的Moran's I指数 |
| 1990-2000年 | 2000-2015年 | 1990-2015年 | |
|---|---|---|---|
| Moran's I | 0.835 | 0.785 | 0.839 |
| Z值 | 68.770 | 64.764 | 69.115 |
| P值 | 0.000 | 0.000 | 0.000 |
| 标准差 | 0.00015 | 0.00015 | 0.00015 |
注:Global Moran's I统计量在所有年份的期望值均为:E(I)=-0.000 274。 |
Fig. 4 Hotspot distribution of expansion for construction land in Hangzhou in 1990-2015图4 1990-2015年杭州建设用地扩展的热点区域分布 |
Fig. 5 Mechanism of "Turning counties (cities) into districts" on urban space expansion图5 撤县(市)改区对城市空间影响的作用机理 |
Fig. 6 Transformation of urban spatial structure图6 城市空间结构变化示意图 |
Tab. 3 Comprehensive expansion coefficient of construction land in Hangzhou in 1990-2015表3 1990-2015年杭州市辖区建设用地综合扩展系数 |
| 1990-1995年 | 1995-2000年 | 2000-2005年 | 2005-2010年 | 2010-2015年 | |
|---|---|---|---|---|---|
| 老城区 | 13.236 | 0.536 | 26.526 | 0.875 | 3.444 |
| 萧山区 | 2.279 | 17.272 | 89.060 | 0.933 | 15.831 |
| 余杭区 | 1.357 | 0.900 | 40.641 | 3.672 | 16.844 |
Fig. 7 Proportion of new land use in two districts in 2000-2015图7 2000-2015年萧山、余杭两区新增用地占杭州市同类用地新增总量比例 |
Fig. 8 Spatial correlation between population growth and construction land expansion in Hangzhou图8 杭州市区人口增长和建设用地扩张的空间相关性 |
The authors have declared that no competing interests exist.
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