中文摘要：

为探讨侵蚀退化过程中地带性土壤结构的变化规律，选取湖北省不同侵蚀程度（微度、轻度、强度、剧烈）的3种典型地带性土壤（黄褐土、黄棕壤、红壤），比较分析了土壤结构稳定性和土壤渗透特性差异。结果表明：随侵蚀程度增加，3种地带性土壤团聚体水稳性逐渐降低，容重增加，饱和导水率呈现不同程度的下降，机械稳定性变化存在差异；在侵蚀程度相同时，3种地带性土壤团聚体机械稳定性、水稳性和饱和土壤导水率的高低顺序均为红壤＞黄棕壤＞黄褐土。相关分析表明，土壤团聚体机械稳定性和水稳性与游离氧化铝呈极显著正相关关系（相关系数=0.77和0.81，P＜0.01），与游离氧化铁呈显著正相关关系（相关系数=0.73和0.76，P＜0.05），说明游离态铁铝氧化物是影响土壤结构稳定性并形成地带性差异的关键因素，饱和导水率与团聚体水稳性指标和非毛管孔隙度、容重呈显著相关关系（P＜0.05），其中与水稳性团聚体分形维数达到极显著水平（相关系数=0.76， P＜0.01），表明水稳性团聚体分形维数可以作为预测和表征饱和导水率的指标。

英文摘要：

It is important to study soil structure characteristics and its zonality difference in the process of soil degradation for understanding soil structure stability mechanism, guiding regional agricultural management, and predicting soil erosion. In this study, we selected different soil erosion degrees （feeble, light, heavy, and severe） of 3 typical types of zonal soils （yellow cinnamon, yellow brown, and red soils） of Hubei province （32°18′N, 112°09′E） and determined their soil saturated hydraulic conductivity, aggregates water stability, porosity distribution and other physical and chemical properties so that we can better understand their changes under different erosion degrees. The results showed that with the increase of the erosion degree, the soil organic matter content decreased gradually. For different zonal soils, the sequence of free iron and aluminum oxides （Fed and Ald） concentration was red soil ＆gt; yellow cinnamon soil ＆gt; yellow brown soil, and the free iron and aluminum oxide concentration had significant difference （P〈0.05） for different soil erosion degrees. The results also showed that the sequence of aggregate mechanical stability and water stability from the 3 zonal soils was red soil〉yellow brown soil 〉yellow cinnamon soil. Except for yellow brown soil, soil aggregate physical stability gradually increased with the increase of soil erosion degree. The＆gt;5 mm aggregate fraction and water stability mean weight diameter （MWD） and geometric mean diameter （GMD） of soil aggregates decreased gradually with the increase of the erosion degree in the 3 soils. Water stable aggregate （WSA） for red soils was evenly distributed among different size fractions, while WSA were distributed mainly〈0.25 mm fraction for yellow brown soils and yellow cinnamon soils, and compared to dry sieving aggregates,＆gt;5 mm WSA decreased significantly （P〈0.05） and it was disrupted into finer aggregate. In addition, the results showed that the soil porosity was be