关键词: 城市生态安全, 景观格局, 景观功能网络, 最小耗费距离模型, 常州

Abstract: To improve and optimize pattern and functions of urban ecosystem, this study tried to indicate urban ecological security pattern conceptually based on correlative studies and chose Changzhou city for a case study. Urban ecological security pattern bythe least-cost distance model was established to integrate natural environment factors and landscape pattern characteristics. Because urban area was composed of social, economic and natural systems, this study divided urban landscape into four color classes according to the various landscape pattern and functions. Hereinto, red landscape was building area that supported living, production, and other social economic activities, gray landscape included different traffic lines and communication corridors could maintain diffusion and transfer of energy, money, products andinformation. Greenlandscape was composed of forest, cropland, and grassland and blue landscape contained river and lake both could preserve biodiversity and adjust environment. Through tracing the landscape function flows, positioning the interaction points of landscape functions, and identifying the frangible area with unsuitable land use, spatial extent with potential ecological risk could be deter mined. Finally, for urban growth and sustainable development, this study put forward urban ecological security pattern to relieve and save ecological risks by setting areas and rules of different land use zones such as prohibited zone, limited area, regulated area, optimized area and potential development area.

Key words: urban ecological security, landscape pattern, landscape function, least-cost distance model, Changzhou