A Study on Characteristic Changes and Causes of Pond Landscape Systems in the Process of Urbanization

WANG Zhifang†, ZHU Ganglu

ACTA Scientiarum Naturalium Universitatis Pekinensis - - Contents - WANG Zhifang, ZHU Ganglu

College of Architecture and Landscape Architecture, Peking University, Beijing 100871; † E-mail: 1301214787@pku.edu.cn

Abstract The study analyzes changes in landscape characteristics of ponds in the Liangjiang New Area. The spatial and temporal changes of ponds were present by quantitative characteristics and spatial distribution characteristics using remote sensing images of 2000 and 2012. Landscape metrics of amount, surface area and density of ponds were calculated to analyze quantitative characteristic changes of ponds associated with increased urbanization. Landscape indices of fragmentation, resolution and connectedness were utilized to describe changes in spatial networks of ponds based on GIS, as well as the relationships between urbanization and them. PLANDS of buffer area around ponds were calculated to analyze changes of lands around ponds, which combined paddy, upland, grassland, woodland, water area and construction area. The results show that the number of ponds was significantly reduced from 1906 to 270 with a reduction rate of 85.8%, and the water surface area decreased from 175.9 to 59.2 hectare with a reduction rate of 66.3% during the 12 years. Increased urbanization is the main reason of the persistent decrease of ponds, especially the effect of roads, squares and lands to be built. Ponds would have a bigger chance to exist if they have a long distance from built-up areas in space distribution. The surface area of ponds existed are between 0.1 to 1 hectare. However, most of the ponds existed had low utilization value except the complete ponds in the residential land with ecological value. The results offer some suggestions for modern sponge city construction. Key words ponds; sponge city; urbanization; landscape characteristic; land use; ecological value

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