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用吸管法测定白浆土、黑土和草甸土的土壤颗粒组成和微团聚体,结果是白浆土普遍存在有粘化层,粘粒的淋淀指数为1.32—3.86,以典型白浆土粘化较重,淋淀指数达2.95～3.86;草甸白浆土和潜育白浆土淋淀指数为1.32—2.55。草甸土和黑土一般无粘化层。粉粒的淋淀指数,白浆土较小,说明粉粒在白浆层中有积累。土壤中的微团聚体组成变化比较复杂,三种土壤之间无一定规律。总的说来,因受腐殖质的影响,三种土壤表层分散系数较低,一般均小于10％;白浆土的分散系数较大,下部土层达20—37％,说明白浆土的母质有较大的分散性。有些黑土和草甸土分散系数虽大,但粘粒没有发生悬浮迁移,这可能与土壤渗透性弱有关。
Soil composition and microaggregates of soil in white soil, black soil and meadow soil were determined by pipette method. As a result, there were ubiquitous sticky layer in white soil, and the deposition index of clay was 1.32-3.86. Typical white soil Viscous heavy, the precipitation index of 2.95 ~ 3.86; meadow white alluvial white soil and soil leaching index of 1.32-2.55. Meadow soil and black soil generally non-stick layer. Powder precipitation index, white soil smaller, indicating that the accumulation of particles in the white pulp layer. Soil micro-aggregate composition changes more complicated, there is no certain law between the three kinds of soil. In general, due to the influence of humus, the three soil surface dispersion coefficient is low, generally less than 10%; white clay soil greater dispersion coefficient, the lower soil layer of 20-37%, indicating the parent material of white soil Have greater dispersion. Although the dispersion coefficient of some black soil and meadow soil is large, there is no suspended migration of clay particles, which may be related to the weak permeability of soil.