This paper deduces a theoretical population model in a urban system under a hypothetical condition of zero population growth (ZPG), and analyses the population dynamics for the model.
本文推演了城市系统中在人口零增长假设条件下的人口迁移理论模型；
So it is extremely urgent to construct new urban model to model the growth of urban.
因此，研究新的城市模型来模拟城市的扩展已经迫在眉睫。
On the basis of geographical sense and mathematical sense, this paper used the model of allometric growth of urban population-area, and a model of rural and urban population-area was generated.
研究中，首先根据地理意义和数学意义，对经典的城市人口-面积异速生长模型进行扩展，推导出城乡人口-面积统一模型。
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