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Study on Characteristics of Virtual Water Flow Spatial Change and Influencing Factors in China
DU Yihang, WANG Jun, LU Shunzi, LI Jingxian, CAI Ailing
Acta Scientiarum Naturalium Universitatis Pekinensis    2019, 55 (6): 1141-1151.   DOI: 10.13209/j.0479-8023.2019.117
Abstract1448)   HTML    PDF(pc) (2675KB)(352)       Save
Population migration and aggregation of industrial factories in the process of urbanization in China has further increased water demand in the relatively developed areas of China. The existing water transfer projects couldn’t meet the increasing demand for water resources in water-scarce areas. The calculation of virtual water based on the input-output analysis and the implementation of reasonable virtual water transfer have become new approaches to relax the demanding pressure on regional water resources. This analysis used the regional inputoutput tables of the years 1997 and 2010 and the water resources bulletins of China to build a multi-regional inputoutput calculation model of virtual water and calculate the exchange relationships and transfer volumes among virtual waters of different industries in detail. This study also analyzed the association of regional virtual water flows with inter-regional population migration and geographic transfers of industries. The results showed that there were highly correlated relationships between the characteristics of regional population migration and virtual water spatial transfer in the context of urbanization in China. The geographic transfers of industries continue to affect the volume and direction of virtual water flows. In the future, researchers should consider the relationship between physical water transfers, virtual water flows, population migration and geographic transfers of industries in the context of urbanization to ensure the supply of water resources in China.
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Spatial Characteristics of Retail Stores in Multiple-Size of Cities in the Central Region of China
CAI Ailing, WANG Jun, LI Jingxian, DU Yihang
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (5): 1114-1122.   DOI: 10.13209/j.0479-8023.2018.024
Abstract739)   HTML    PDF(pc) (4141KB)(285)       Save

Three cities (Wuhan, Xiangyang, and Yidu) were selected as samples of three typical sizes of cities (large, medium, and small) in China to study the spatial layout of retail stores. The authors analyzed the spatial characteristics of different types of retail stores and the influential factors of their spatial distributions using tools of spatial statistics, based on big data of retail stores from the Baidu map. The results show that the spatial distribution of retail stores in the large city of Wuhan shows the characteristics of multi-center and multi-layer, while Xiangyang, the medium-sized city, shows a single center layout, and Yidu, the small city, shows dispersed layout. The agglomeration levels of different types of retail stores show a sequence: integrated retail store > professional retail store > supermarket > special retail store. Population size, transportation accessibility, types of retailing, and green-space accessibility are the main factors which affect the spatial distributions of retail stores. The results can provide the scientific basis for spatial planning and optimization of retail stores in multiple sizes of cities.

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