Abstract
Abstract. The evolution analysis of urban landuse and spatial ecological performance are necessary and useful to recognizing the stage of urban development and revealing the regularity and connotation of urban spatial expansion. Moreover, it lies in the core that should be exmined in the urban sustainable development. In this paper, detailed information has been acquired from the high-resolution satellite imageries of Guyuan, China case study. With the support of GIS, the land-use mapping information and the land cover changes are analyzed, and the process of urban spatial ecological performance evolution by the hierarchical methodology is explored. Results demonstrate that in the past 11 years, the urban spatial ecological performance show an improved process with the dramatic landcover change in Guyuan. Firstly, the landuse structure of Guyuan changes significantly and shows an obvious stage characteristic. Secondly, the urban ecological performance of Guyuan continues to be optimized over the 11 years. Thirdly, the findings suggest that a dynamic monitoring mechanism of urban land use based on high-resolution remote sensing data should be established in urban development, and the rational development of urban land use should be guided by the spatial ecological performance as the basic value orientation.
Highlights
According to the map information of the building area extracted from the remote sensing images of Guyuan city, combined with the quantitative calculation of the related indexes of urban spatial expansion, it is found that the spatial expansion of urban construction land in Guyuan's shows a typical periodicity and a clear direction of expansion
For the complication of morphological structure and the incoordination of elasticity between population growth and land expansion(REN Xiaojuan, 2017 ), it is typical to study the ecological performance of spatial expansion in Guyuan
3.2.2 Evaluation the Ecological Performance at the whole level: Judging from the development process, the spatial expansion in the previous period is larger than that in the later, because the scale of the land with ecological value in the previous period increases significantly in the scope of the study. In the latter period, with the acceleration of the spatial expansion, the increase of artificial land is obvious, the growth rate of green space is smaller than the previous period
Summary
Guyuan is a regional central city in the south of Ningxia with prominent contradiction between people and land. Since the establishment of the city in 2002, the economic structure of Guyuan has been continuously transformed, the economic growth rate has been constantly rising, and the urban space has changed from a single center to a multi-group with the expansion trend of "leapfrog". According to the map information of the building area extracted from the remote sensing images of Guyuan city, combined with the quantitative calculation of the related indexes of urban spatial expansion, it is found that the spatial expansion of urban construction land in Guyuan's shows a typical periodicity and a clear direction of expansion. For the complication of morphological structure and the incoordination of elasticity between population growth and land expansion(REN Xiaojuan, 2017 ), it is typical to study the ecological performance of spatial expansion in Guyuan
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