基于喀斯特地区的广西都安瑶族自治县1977年航片数据，1988年、1999年和2005年遥感影像数据，通过分形模型，计算出这4个时相各土地类型的分形维数和稳定性指数。结合28年来各土地类型的面积及斑块数量变化情况，定量分析其土地利用空间格局变化，并以此为依据，探讨各土地利用类型的复杂性和稳定性，分析喀斯特地区土地利用空间格局变化的原因。结果表明：28年来，各地类间的稳定性指数差别很大，同一地类不同时期的稳定性指数也有较大差别。这种变化与喀斯特地区先天脆弱的地质——生态背景有关外，还与各种垦荒、毁林、政策、管理保护等人为因素密切相关。%By applying fractal model, we calculate the fractal dimension and stability index of land types in the four time phases based on the aerial-photographs data of 1977 and the remote sensing image data of the year 1988,1999,2005 of Du＇ an county in Guangxi. Then, combined with the change of land types and plaque quantity over the 28 years, we qualitatively analyze the spatial pattern of land use. After this, we study the complexity and stability of land use types so as to analyze the reasons for spatial pattern of land use in karst areas. The results revealed that： the stability index among the land type differs much and the stability index of the same land type during various periods is also different. The change is related to the innate fragile geological, ecological background of karst areas and some human factors such as reclaiming wasteland, policy, management, protection and so on.
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