TROPICAL GEOGRAPHY ›› 2018, Vol. 38 ›› Issue (5): 689-698.

### Regional Difference and Driving Mechanism of Construction Land Expansion Types in Prefecture-level Cities of Guangdong Province

DENG Ruimin1,2，LI Shaoying3，WU Zhifeng3，KUANG Yaoqiu1,2，MA Shifa4

1. （1．Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China；2．University of Chinese Academy of Sciences，Beijing 100049，China；3．School of Geographical Sciences，Guangzhou University，Guangzhou 510006，China； 4．Land and Resources Information Center of Guangdong Province，Guangzhou 510075，China）
• Online:2018-09-05 Published:2018-09-05

Abstract:

At present，most research about urban expansion patterns focus on the identification of urban expansion types and the analysis of the urban expansion process and laws in a single city. It is lack of the study about the comparative analysis of urban expansion types at cities with different stages of development. Based on the Landscape Expansion Index (LEI)，which obtains the information about the spatio-temporal dynamic changes of land patterns, In this paper, the newly added construction land expansion types are divided into three types: outlying, edge-expansion, and infilling, other extension types can be considered as combinations or variants of the three basic extension types. This study quantitatively identifies the expansion types of 21 prefecture-level cities in Guangdong Province from 2009 to 2014 by LEI, compares and analyzes the expansion types combinations and differences in cities at different stages of development，and reveals the spatial differentiation of cities on provincial scale. In addition, the stepwise regression model is used to explore the driving mechanism of different expansion types．The results are summarized as follows：1）The newly added construction land expansion types of 21 prefecture-level cities in Guangdong Province from 2009 to 2014 are mainly of edge-expansion type，followed by infilling type and outlying type, the ratio of three expansion types is: 68:18:14. It is clearly that the proportion of outlying type and infilling type was inversely proportional, the cities with a high expansion type ratio of the outlying, the proportion of the infilling type is lower; on the contrary, the city with a higher proportion of the infilling type has a lower expansion type ratio of the outlying. 2）There is an agglomeration effect in cities with a higher outlying and infilling type ratio of newly construction land. In addition to Shantou City, the city with a large proportion of infilling type are concentrated in the Pearl River estuary area，which showed a 'small triangle' shape，while the cities with high proportion of outlying type are distributed around cites with a high proportion of the infilling type, forming a ‘big triangle’ shape outside the Pearl River Delta region．And cities with a higher proportion of edge-expansion type have no obvious spatial distribution 3）Three land expansion types have different driving mechanisms. The population density is the main influencing factor of the outlying type, the lower the population density is，the more the new construction land will be in the form of outlying type．The edge-expansion type is affected by the proportion of non-construction land and population density, the city with higher proportion of non-construction land and higher population density has more new construction land with edge-expansion type. The infilling type is affected by land urbanization rate, the new construction land with infilling type is more likely to appear in cities with high urbanization rates.