The corridor effect of metropolitan spatialextension and optimization of landscape structure—the case of Beijing

Because of the existence of gradient field of the urban center and the corridor effect. underthe drive of going merely after economic benefit, the city intrinsically has the trend of massive growth, and this will seriously destroy the urban reasonable landscape structure and the ecological equilibrium.By applying the theory of corridor effect. this paper studies the interactive process between artificialcorridors and natural corridors. At the same time, by studying the Beijing's spatial extension pattern in central urban area during different periods. this paper analyses the corridors extension volume.extension velocity and variant tendency of urban landscape on & directions. Moreover. this paperbrings forward the idea of incorporating the systen of natural corridors into the Beijing'smetropolitan planning, namely to form a star-shaped scattering-group pattern in which artificialcorridors and natural corridors are alternately distributed in order to effectively prevent built-up areafrom massive growth .