中文摘要：

分析了1990-2004年广州市土地利用结构的变化和基于Moran＇s I的土地利用程度空间自相关变化。广州市土地利用结构中，耕地和林地面积占较大比例，但是面积比例在减少；而建设用地和水域用地的面积比例较小，但有所增加。广州市土地利用程度呈高度的正全局空间自相关，各局部空间自相关类型呈同心圆分布，中间为高高集聚，外围为低低集聚，两者之间为非集聚和零散的高低、低高集聚，呈现出单中心结构。1995年以后，Moran＇s I有所下降，说明这种单中心结构在弱化。单中心结构的优点在于增强中心地区土地集约利用的空间集聚，但同时也说明外围土地利用程度较低地区的空间集聚性，中心和外围的土地利用存在空间不平衡。

英文摘要：

Land use structure change and change of spatial autocorrelation based on Moran＇s I of land use degree of Guangzhou in 1990, 1995, 2000 and 2004 were analyzed in the paper. Cultivated land and forestland occupied a larger proportion in land use structure but the areal proportion is reducing, whereas construction land and water areas were relatively smaller but increasing. Land use degree of Guangzhou City is highly positive global spatial autocorrelated. The spatial autocorrelation types of Guangzhou City land use degree is distributed in a centric circle. High-high aggregation is in the central part and low-low aggregation is in the peripheral area. Non-aggregation and Sparse low-high and high-low aggregation are in the intermediate area. Decrease of Moran＇s I since 1995 shows the weakening of the single-center structure of land use degree. Single-center structure of land use degree is advantageous in reinforcing the spatial aggregation of land intensive utilization, but it also indicates the spatial aggregation of low land use degree area and the spatial imbalance of land use.