Analysis of the Changes and Assessment on the Efficiency of Urban Construction Land in Three Gorges Reservoir Area Based on GIS and DEA
Received date: 2010-01-01
Revised date: 2010-07-01
Online published: 2010-11-25
Spatial expansion of urban construction land is a primary expression of urban development, and the changes of structure and quantity of construction land will impact the using efficiency of construction land. This paper utilized the land use maps of the Three Gorges Reservoir Area of the years 2000 and 2005, and ArcGIS to analyze the spatial transformation between urban construction land and other land use types in the region. The expansion of urban construction land has led to a rapid reduction of cultivated land. Some 6004.77 hm,sup>2 cultivated land were transformed into urban land. The average area of plots reached 115.48 hm,sup>2. The paper analyzed the regional difference in occupying agricultural land for urban development. In the region of Banan District, Jiangbei County and Chongqing urban area, comparatively larger area of agricultural land is occupied each year. Riparian buffer was established to analyze the intensity of urban land expansion. In the reservoir area, urban land expansion mainly lies within a radius of 0-10 km from the buffer zone. Combining the analysis of the changes in urban land use, adopting DEA model and assessing construction efficiency by applying efficiency value, DEA validity, and scale efficiency, we made a benefit evaluation of construction land use, and used ArcGIS to spatialize efficiency value, DEA validity and scale efficiency. The study showed that the urban construction lands with high efficiency values were distributed in the downstream reservoir area and Chongqing urban area. The overall efficiency of urban construction land is improving, and the disparity among regions is gradually narrowing. Finally, this paper gave some suggestions on improving the efficiency of urban land use in the reservoir area.
Key words： ArcGIS; DEA; efficiency; Three Gorges Reservoir Area; urban construction land
ZHOU Wei, CAO Yingui, WANG Jing, YUAN Chun, QIAO Luyin . Analysis of the Changes and Assessment on the Efficiency of Urban Construction Land in Three Gorges Reservoir Area Based on GIS and DEA[J]. PROGRESS IN GEOGRAPHY, 2010 , 29(11) : 1420 -1426 . DOI: 10.11820/dlkxjz.2010.11.038
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