采用吸管法分散分离提取土壤微团聚体和机械组成,通过测定土壤有机质含量和pH值,研究了重庆缙云山典型林分林地土壤微团聚体特征及其与土壤理化性质的关系。结果表明:重庆缙云山典型林分林地土壤均呈酸性,沿土壤自然剖面向下pH值呈逐渐增大趋势,而有机质含量逐渐降低。各林地的土壤物理性粘粒综合含量依次为农地(对照)(75.31%)>混交林地(69.87%)>灌木林地(68.81%)>阔叶林地(55.19%)>楠竹林地(44.87%)。各林分一定程度上均能改善土壤的颗粒组成状况,调节土壤结构和土壤肥力,楠竹林分相对较弱。各林地土壤沿自然剖面向下,土壤微团聚体水稳定性减弱。林地土壤微团聚体的团聚度大小为灌木林地(36.4%)>农地(对照)(27.96%)>混交林地(26.19%)>阔叶林地(15.13%)>楠竹林地(10.86%),分散系数大小为灌木林地(23.43%)<混交林地(33.6%)<农地(对照)(46.38%)<楠竹林地(47.04%)<阔叶林地(47.85%)。林地土壤微团聚体数量与有机质含量和物理性粘粒含量均呈正相关,表现为y=0.1048x有机质-0.8413与y=0.9097x粘粒+41.61。有机质是典型林分林地土壤微团聚体形成的重要因素,物理性粘粒则对其形成起着重要的胶结作用。灌木林地土壤微结构水稳定性优于其他林地,其改善土壤微结构、调节土壤保水保肥能力最好,而楠竹林地相对最差。 Soil micro-aggregates and their mechanical composition were separated and extracted by pipette method. The characteristics of soil micro-aggregates and their relationship with soil physical and chemical properties in typical forest stands of Jinyun Mountain in Chongqing were studied by measuring soil organic matter content and pH value. The results showed that the soil in typical forest stands of Jinyun Mountain in Chongqing was acidic, and the soil pH was gradually decreased along the natural profile of the soil, while the content of organic matter decreased gradually. The comprehensive content of soil physical clay in each forest land was in the order of 75.31% for agricultural land, 69.87% for mixed forest, 68.81% for shrubbery, 55.19% for broad-leaved forest, 44.87% ). To some extent, each stand can improve the soil particle composition, adjust the soil structure and soil fertility, bamboo stands relatively weak. The soil of each forest is down along the natural profile, and the water stability of soil microaggregates is weakened. The reunion degree of forest soil microaggregates was shrubland (36.4%)> agricultural land (control) (27.96%)> mixed forest (26.19%)> broadleaf forest (15.13%)> bamboo forest (10.86% The distribution coefficient is shrubland (23.43%)