中文摘要：

运用分形理论分析了南方花岗岩红壤不同土地利用类型土壤结构的分形特征及其分异规律。结果表明：（1）表土层土壤机械组成分维数排序为典型林分林地2．856〉疏林地2．74〉荒草地2．719〉坡耕地2．703〉旱地2．693，与小于0．005mm粒径含量呈极显著相关；（2）土壤微团聚体组成分维数排序为荒草地2．167〈典型林分林地2．192〈疏林地2．195〈坡耕地2．243〈旱地2．424，与小于0．001mm微团聚体含量的自然对数呈极显著相关；（3）表土层土壤团聚分维数排序为典型林分林地1．512〈坡耕地1．852〈荒草地1．872〈疏林地2．010〈旱地2．027，与大于0．25mm团聚体含量呈显著相关；（4）表土层土壤水稳性团聚体分维数排序为荒地2．268〈疏林地2．469〈坡耕地2．491〈典型林分林地2．542〈旱地2．607，与结构破坏率呈极显著相关，与大于0-25mm水稳性团聚体含量呈极显著相关。结果显示．分维数能客观地表征土壤结构特征，不同土地利用类型土壤结构分异规律明显，林分能较好地改善土壤结构

英文摘要：

The fractal theory, was applied to analyze the fractal property of red soil derived from granite under different land-use types. The results showed the conclusions as the following.（1） The fractal dimensions of topsoil particle was in order of forest land （2.856） 〉 sparse-wood land（2.74） 〉wilderness land （2.719） 〉slope farmland （2.703）〉dry land （2.693）, and they were significantly regressive correlated With the contents of particle fractions less than 0.005mm;（2） The fractal dimensions of topsoil micro-aggregate was in order of wilderness land （2.167）〈 forest land（2.192）〈 sparse-wood land （2.195）〈 slope farmland （2.243）〈dry land （2.424）, and they were significantly regressive correlated with the natural logarithm of contents of micro-aggregate less than 0.00hnm; （3） The fractal dimensions of topsoil aggregate was in order of forest land （1.512）〈slope farmland （1.852）〈wilderness land （1.872）〈sparse-wood land （2.010） 〈dry, land （2.027）, and they were significantly regressive correlated with the contents of aggregate more than 0.25ram; （4）The fractal dimension of topsoil water-stable aggregate was in order of wilderness land （2.268） 〈 sparse-wood land （2.469） 〈 slope farmland （2.491） 〈 forest land （2.542） 〈dry land （2.607）, and they were significantly regressive correlated with the structure damage rates of soil aggregate and the contents of water-stable aggregate more than 0.25mm. The results showed that the fractal dimensions could be used to indicate the characters of soil structure, and vegetation could improve soil structure effectively.