关键词: 土壤抗剪强度, 植被类型, 土壤剪切试验, 辽河流域

Abstract: Soil shear strength is a generally accepted comprehensive indicator characterizing soil erosion resistance. In this study, we selected five types of vegetation covered lands and bare land as the research objects in the desertification area of western Liaoning Province and analyzed the effect of different vegetation types on soil shear strength. The result showed that the shear strength of five types of vegetation and bare soil from high to low were arbor-shrub mixed forest, shrub forest, grasslands, arbor forest, bare land, farmland. The soil shear strength of arbor-shrub mixed forest was 6% higher than that of shrub land and 29.31% higher than that of bare land. The shear strength of farmland and grassland were 31.6% and 26.03% lower than that of arbor-shrubs mixed forests respectively, because of frequent farming. Arbor-shrubs mixed forest has the highest soil shear strength because of the interaction of soil organic matter, plant roots and soil aggregates.

Key words: soil shear strength, vegetation types, soil shear tests, Liaohe River Basin;