Acta Geographica Sinica ›› 2015, Vol. 70 ›› Issue (11): 1800-1810.doi: 10.11821/dlxb201511009

• Orginal Article • Previous Articles     Next Articles

The relationship of evolution between urban land use types and intensity in Nanjing since the early 21st century

Weifeng QIAO1,2,3(), Yansui LIU2(), Yahua WANG1,3, Bin FANG1,3, Youchen ZHAO1   

  1. 1. School of Geography Science, Nanjing Normal University, Nanjing 210023, China
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
  • Received:2015-01-19 Revised:2015-04-08 Online:2015-11-20 Published:2015-11-25
  • Supported by:
    National Natural Science Foundation of China, No.41371172, No.41130748, No.41471143, No.41271189;Special Financial Grant and General Financial Grant from the China Postdoctoral Science Foundation, No.2015T80127,No.2014M561040;A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, No.164320H101

Abstract:

Three-dimensional urban space expansion has become an important feature of China’s urban spatial expansion since the early 21st century. Based on the three-dimensional digital reconstruction results of Nanjing in 2000 and 2012, this paper expanded the application methods of land use types transfer-matrix to study the evolution of land use intensity caused by the changes of land use types in urban built-up areas. The results consist of three aspects: (1) Nanjing's built-up area has experienced rapid expansion since the early 21st century, and it expanded 50.50 km2 per year on average. During the past 12 years, industrial land attained maximal growth with an expansion of 155.34 km2, and its main incremental source was agricultural land, followed by residential land. Agricultural land and water area decreased obviously, and the lost agricultural land was transferred mainly to industrial land. (2) The sequence of average plot ratio of five major land use types in built-up areas, which were commercial land, residential land, educational land, industrial land and land for other construction purposes in descending order, did not change from 2000 to 2012, and the average plot ratio of the first four land use types increased by 0.59, 0.48, 0.31 and 0.06, respectively. In the transformation processes of five major land use types in built-up areas, the plot ratio of residential land converted to other construction land decreased, while other conversion types significantly increased. The plot ratio of unchanged land use types also constantly rose. (3) The plot ratios of new residential and educational lands as well as land for other construction purposes exceeded those of the corresponding land types in the old town, suggesting that the plot ratios of land types in the urban expansion area were at a higher level. The plot ratios of new industrial land and old industrial land were unchanged. The plot ratio of new commercial land was 65.67% of that of old commercial land.

Key words: improved transfer-matrix method, urban land use type, land use intensity change, Nanjing