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中文摘要：
通过计算信息熵和均衡度，分析了从1959—2001年兰州市区土地利用变化特征，运用定性与定量相结合的方法，分析了兰州市区土地利用变化的驱动力。研究结果显示，近50年来兰州市区土地利用变化的信息熵和均衡度均出现逐渐增大的趋势，随着城市空间的扩展，城市用地结构正向均衡状态发展。城市土地利用变化的驱动力主要为经济发展，同时受到自然环境的制约和城市职能提升、城市空间扩展的影响。
英文摘要：
This paper probes into the changes in land use in the central area of Lanzhou from 1959 to 2001 and reveals all the driving factors leading to such changes based on system theory. It cal- culates and compares the information entropy and equilibrium degree of land use structure. Re- suits show that the information entropy and equilibrium degree of land use structure are increas- ing gradually. With the spread of urban space, the land use structure is developing in a balanced way. According to the analysis of driving factors, economic development is the main driving factor of urban land use change. Meanwhile, natural environment, the upgrading of city function and the spread of urban space have also effected land use.
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