简析城市地貌环境脆弱带

ON THE FRAGILE ZONE OF URBAN GEOMORPHIC ENVIRONMENT

论述了城市地貌环境的脆弱性，分析了其脆弱带的特点，认为环境的变异敏感度高、持续利用性降低和对灾变的承受弹性减小是城市地貌环境脆弱带的重要特征。

Attention has been paid to fragile zone, the most active part of environment, by the academic circles.Urban geomorphic environment (UGE) is composed of 2 regional systems (urban built-up area and urban fringe) and 3 geomorphic units (natural landforms, man-made landforms and compound landforms). UGE becomes fragile obviously with the growing intensification of feedback effects caused by human activities in urban areas. In urban fringe, the artificial geomorphic agent is the most active, so there are increasing susceptibility of environment tO variation, lowering sustainable utilization and weakening elasticity of bearing capacity of UGE to catastrophic processes. Therefore, urban fringe is the fragile zones of UGE. At present, the area of fragile zones of UGE are about 1000 km2 in China. UGE is tending to fragility because of the pressure of increasing population, unrational use of UCE and the lack of consciousness on the environment in the public.