基于地形位的城郊景观分布特征及变化

Distribution Characteristics and Dynamic Change of Suburb Landscape Based on the Terrain Niche

利用地理信息系统模型建模方法,将高程和坡度组合成一个地形位指数,基于地形位指数对广州市城郊景观分布特征及其变化进行了研究.结果发现,在快速的城市化过程中,广州市白云区低地形位地段的开发强度比高地形位地段变得愈来愈强,开发范围也日益扩大.城镇用地从地形条件较好的低地形位区域向较高的地形位区域迅速扩张.林地、农业用地、果园在城镇用地的挤压下,分布重心向较高地形位的区段转移.水体的面积虽然在增大,但其地形位在进一步向低地形位收缩.

Based on the GIS technology and terrain niche index analysis method, land use change of Baiyun district, Guangzhou city was studied. The results showed that during the process of rapid urbanization from 1988 to 2002 in the studied area, the utilizing intensity of the areas with low terrain niche in- dex became higher than that of the areas with high terrain niche index gradually, and the development extent of land also enlarged. Urban development was expanded greatly from the lower terrain niche areas to the higher terrain niche their spatial distribution distribution was changed areas; Forest, farmland, orchard were under the pressure of urban development, was moved to the higher terrain niche areas; the water area increased, but its to the low terrain niche because water expansion required relatively strict natural condition （ e. g. water sources） of low terrain niche area.