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运用核密度估计法,发现我国生产性服务业从业人口密集区与我国高速铁路网络高度耦合,呈现全国性集聚与省域集聚并存的特点。高速铁路的“廊道效应”促使高速铁路沿线城市生产性服务业密集程度差异呈扩大趋势,而并未对非高速铁路沿线城市的生产性服务业密集程度产生明显影响。在加权平均旅行时间的基础上,引入城市每日高速铁路运营的频次,以此改进可达性的测度方法。结果显示,高级网络节点城市的向心集聚力在高速铁路“虹吸效应”的作用下呈规模递增趋势,并通过扩大与周边腹地差距,形成生产性服务业集聚的核心城市。在多中心区域密度函数的基础上,运用动态VPM模型,分析了高速铁路影响下的各个核心城市生产性服务业空间集聚和扩散的动态过程。结果表明,生产性服务业从业人口密集区域的范围有向高速铁路沿线收缩与向高级网络节点城市收缩的态势,呈现局域的集聚和全域的分散状态。长期而言,生产性服务业有向多核心网络式结构演变的趋势。
By using the method of nuclear density estimation, we find that the densely populated areas of producer services in our country are highly coupled with the high-speed railway network in our country, showing the characteristics of national agglomeration and provincial agglomeration. The “corridor effect” of high-speed railways has led to an increasing trend in the intensity of urban producer services along the high-speed railways, without any significant impact on the intensity of producer services in cities along the non-high-speed railways. Based on the weighted average travel time, the frequency of daily high-speed railway operation in the city is introduced to improve the measure of reachability. The results show that the centripetal agglomeration in the advanced network node cities is increasing in scale under the effect of high-speed railway “siphon effect” and forms the core city of productive service agglomeration by expanding the gap with the surrounding hinterland. Based on the multi-center density function, the dynamic VPM model is used to analyze the dynamic process of agglomeration and diffusion of producer services in each core city under the influence of high-speed railway. The results show that the range of densely populated areas in productive service industry is shrinking along the high-speed railway line and shrinking to the nodes of the advanced network nodes, showing local agglomeration and global dispersion. In the long run, producer services have the tendency to evolve into a multi-core network structure.