快速城市化过程中城市土地覆被的时空动态特征

1990—2005年间，是广州市经济快速发展和城市景观变化最大的时期，以同时段TM影像解译得到广州市的土地覆被类型图，从数量结构、空间信息及位置转移和景观等方面，分析了广州市土地覆被的动态特征．数量结构的研究结果显示：在快速城市化过程中广州市的耕地、林地等自然资源的利用程度在加大，自1995年起，这种变化的趋势开始减缓；土地覆被类型之间的信息与位置的转移变化频繁，并且表现出空间位置分异的特征．景观特征指数分析结果表明：广州市城市土地覆被向破碎化方向发展，城市建设用地呈扩展之势．

Temporal and Spatial Dynamic Characteristics of Urban Land Cover in the Process of Rapid Urbanization

From 1990 to 2005, Guangzhou experienced rapid economic growth and there was a most significant change about land cover during the period. Based on the four TM images respectively in 1990, 1995, 2000 and 2005 years, the dynamic characteristics of urban landscape from the standpoint of land cover were analyzed. It shows that some important land sources were transformed when urbanized, such as cropland, forestland and green land being transferred into construction and mad lands. The period from 1990 to 1995 was one that the area of cropland, forest land and green land decreased most quickly. However, the tendency weakened since 1995. Besides, the transformation between different types of land cover changed very frequently and significant regional difference could be seen. Characteristic indices of landscape revealed that the basic trends of land cover in Guangzhou city included fragmentation and the extension of construction lands.