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港口外贸卸货港的空间分布与等级体系是港口国际经济联系特征的直接体现。广州港外贸卸货港明显具有非均衡集中的空间分布特征。根据Zipf指数可将外贸卸货港的等级体系分为不同类型,广州港外贸卸货港属于极强位序规模分布类型,非均衡分布特征极为明显,但非均衡的程度有所降低,呈现出向强位序规模分布演变的趋势。广州港外贸卸货港体系的首位度较高,表明首位卸货港香港在广州港外贸运输中的优势地位依然明显。广州港低位序外贸卸货港发展较快,但中等位序卸货港的发展则相对较慢,导致了外贸卸货港体系的首位度上升、Zipf指数下降。
The port distribution and grading system of port foreign trade unloading ports are the direct manifestation of the international economic relations of ports. Guangzhou Port foreign trade unloading port obviously has the characteristics of the spatial distribution of non-equilibrium concentration. According to the Zipf index, the classification system of foreign trade discharge port can be divided into different types. The port of discharge of foreign trade of Guangzhou Port belongs to the extremely strong distribution of sequence types. The unbalanced distribution is extremely obvious, but the degree of disequilibrium is reduced. The trend of order and scale distribution evolution. Port of Guangzhou Port Foreign Trade unloading port system, the first degree is higher, indicating that the first port of discharge of Hong Kong in Guangzhou, Hong Kong’s foreign trade and transport in the dominant position remains significant. The port of discharge of low-order foreign trade in Guangzhou Port developed rapidly, but the development of the port of medium-order discharge was relatively slow, leading to the rise of the port of discharge system of ports of trade and the decrease of the Zipf Index.