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[1]LYU Zhiqiang,DENG Rui,QING Shanshan.Spatial Expansion and Topographic Differentiation of Urban Construction Land in Large Mountainous Cities[J].Research of Soil and Water Conservation,2017,24(01):232-238.

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Spatial Expansion and Topographic Differentiation of Urban Construction Land in Large Mountainous Cities

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 232-238 Column: Public date: 2017-02-28

Title:: Spatial Expansion and Topographic Differentiation of Urban Construction Land in Large Mountainous Cities

Author(s):: LYU Zhiqiang, DENG Rui, QING Shanshan; Department of Land Resource Management, Chongqing Technology and Business University, Chongqing 400067, China

Keywords:: construction land expansion; mixed pixel decomposition; terrain gradient; large mountainous cities

CLC:: F301.2;P208

DOI:: -

Abstract:: The urbanization process in China has entered the accelerating stage in recent years, the urban construction land is increasingly scarce, especially in the mountainous city, the contradiction between supply and demand of construction lands is obvious. Based on the terrain gradient change of urban construction land expansion, we used remote sensing image data of the main urban area in 2001, 2007 and 2014 in Chongqing City to extract the urban construction lands by using the method of decomposition of mixed pixels. The fractal dimension of construction land, compact index and the radial index were computed to analyze the main urban construction land expansion form change characteristics of horizontal direction. Combining urban construction land with the regional elevation and relief, we analyzed the construction land differentiation characteristics of terrain. The results showed that the city scale expanded rapidly, and the area of construction land increased from 237.62 km² to 818.85 km² during the period from 2001 to 2014. With respect to comprehensive fractal dimension index, compact city index, the radial index in general, urban expansion is compact extension type, but during the period from 2007 to 2014, the urban expansion shifted toward the epitaxial extension type. Urban expansion appeared as compact extension type in the period from 2001 to 2007, but it turned to epitaxial extension type in the period from 2007 to 2014. The urban construction land in low elevation area reached to the saturated state, while high elevation area is a growing momentum, from the point of rolling degree analysis, construction lands are unable to expand to the larger area.

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