郑州城市建设用地扩张格局及其动力机制

Pattern of Urban Construction Land Expansion and Its Dynamic Mechanism in Zhengzhou

为了解深化改革时期郑州城市建设用地空间演变特征,保障城市用地合理扩张,基于多时相遥感影像数据,采用多种模型方法分析了1990～2016年间郑州城市建设用地扩张的时空变化及其驱动因素。结果表明:(1) 2000年以前郑州城市建设用地扩张速率和贡献率均处于较低水平; 2000年以后处于快速扩张时期,扩张速率先上升后下降,扩张贡献率一直维持在较高水平;城市空间形态趋于简单但稳定性逐渐减弱。(2)城市空间扩张由蔓延式向跳跃式转变,呈明显的圈层格局;新增建设用地主要分布在距离市中心6～18 km处;扩张方向主要集中在东、西、南3个方向,城市重心向东转移888.2 m。(3) 2026年城市建设用地Logistic预测值为755 km2,结果较为可靠。(4)研究期内,市场经济的作用力呈现下降趋势,政策制度、全球化、社会发展和交通区位的作用力呈现上升趋势。最后提出合理行政干预、健全市场机制、进一步加强经济全球化和区域一体化发展的建议,以期优化城市空间结构。

In order to understand the spatial evolution characteristics of urban construction land in Zhengzhou in the period of deepening reform, according to the data of multi-temporal remote sensing images, we analyzed the temporal and spatial variations of urban construction land expansion and its driving factors in Zhengzhou during 1990-2016 by using a variety of model methods. The results showed that： （1） The urban construction land expansion rate and contribution rate in Zhengzhou were at a low level before 2000; after 2000, this city was in a period of urban construction land rapid expansion, the expansion rate increased first and then decreased, the contribution rate of expansion was maintained at a high level all the time, and the urban spatial form tended to be simple, but its stability was gradually weakened; （2） The expansion of urban space changed from sprawl type to leap type, and it revealed an obvious circle pattern; the new construction lands were mainly distributed within the scope of 6-18 km away from the city center; the directions of expansion were mainly concentrated in the east, west and south, and the urban gravity center was shifted by 888.2 m toward the east; （3） In 2026, the Logistic predicted value of urban construction land was 755 km^2, which was relatively reliable; （4） In the study period, the force of the market economy exhibited a downward trend, while the forces of the policy, system, globalization, social development and transportation location revealed an upward trend. Finally, the author put forward the following suggestions for the optimization of urban spatial structure： conducting reasonable administrative intervention, perfecting market mechanism, and further strengthening economic globalization and regional integrated development.