中文摘要：

在一个较小的时空尺度上对典型喀斯特地区石漠化过程中的土壤质量演变特征及其退化过程进行了探讨。结果表明：由于植被破坏和耕地的开垦发生土壤颗粒粗化，向石漠化景观发展，土体结构破坏，容重增加0．12～0．60g／cm^3，总孔隙度降低12．0％～39．8％，持水性能变劣，养分也随之下降；〈0．05mm的粘粉粒流失，表层土壤有机质和全氮含量下降33．4％～84．6％和43．3％～85．2％。土壤质量的演变，既有系统本身的自然属性决定的内在原因，更重要的是人为的外部干扰体系的驱动；演变的过程既有渐变型，又有跃变型。

英文摘要：

From the aspects of physics and chemistry, the process and characteristics of soil quality degradation in Guizhou karst area were discussed. Results showed that in the rocky desertifcation process of soil, a series of physical and chemical properties worsened associated with losses of soil fine particle materials, including bulk density raised, total porosity reduced, aeration and non-capillary porosity increased, water-holding capacity relented, soil organic matter,total N and P contents decreased, the majority of silt and clay contents（〈0.05 mm） were removed,could result in the decreases of soil organic matter and total N contents. Dusiturbances induced by farmers （i. e. irrational land cultivation and vegetaion was destroied） was the main force of soil quality evolvement. The models of soil quality degaradation process was gradual degradation course and leap degradation course.