中文摘要：

通过对重庆四面山的槲栎林、川柯林、柳杉林和毛竹林4种林地土壤颗粒状况的分析,探讨不同林地土壤颗粒特征及其与土壤侵蚀之间的关系。结果表明：除柳杉林以外,其他林地土壤均属于级配良好土壤,毛竹林表层土壤颗粒的分散度较低、偏度较大,土壤颗粒分布不均衡,土壤流失程度较高。不同林地土壤的微团聚体分形维数表现为川柯林40-60cm层最小,柳杉林0-20cm层最大,微团聚体分形维数与〈0.001mm粒级微团聚体含量成正比,与0.25～0.05mm粒级微团聚体含量成反比。川柯林土壤团聚状况最高（19.38%）,分散率最低（32.13%）;柳杉林土壤团聚状况最低（10.88%）,分散率最高（74.41%）。

英文摘要：

Through analysis of soil particles situation in 4 different forestlands of Quercus aliena, Lithocarpus fangii, Cryptomeria fortunei and Phyllostachys heterocycla cv. pubescens in Simian mountains in Chongqing, the relationship between different forestland soil particles characteristics and soil erosion was discussed. The results showed that most of the forestlands soil were good gradation soil except Cryptomeria fortunei. Phyllostachys heterocycla cv. pubescens forestland. Surface soil particles dispersion was lower and soil particles skewness was larger, so the soil particles were with unbalanced distribution and the extent of soil loss was higher. The fractal dimension of soil micro-aggregates structure of the 40--60 cm layer of Lith- ocarpus fangii forestland soil was the smallest and the 0--20 cm layer of Cryptomeria fortunei forestland soil was the largest; The fractal dimension of soil micro-aggregates was proportional to the 〈0. 001 mm soil micro-aggregates content and inversely proportional to the 0. 25---0. 05 mm soil micro-aggregates content. Lithocarpus fangii forestland soil was with the highest aggregation condition（19.38%） and the lowest rate of divergence（32.13 %）, and Cryptorneria fortunei forestland soil was with the lowest aggregation condition （10.88%） and the highest rate of divergence（74.41%）.