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对云南、贵州和安徽等地的紫色土无机胶体 (<0 0 0 2mm粘粒 )的含量状况和矿物学组成特征作了初步探讨 ,它们的共同特点是 :紫色土 <0 0 0 2mm胶粒含量均小于贵州的对照土壤———黄壤的胶体含量 ;紫色土含较多 2∶1型黏土矿物和间层型矿物质、含较少的 1∶1型黏土矿物和胶粒中含较多石英。对照土壤———黄壤则主要含 1∶1型黏土矿物和石英。并且分析了无机胶体与土壤肥力的关系。
The content and mineralogical composition of purple soil inorganic colloids (<0 0 0 2mm clay) in Yunnan, Guizhou and Anhui were preliminarily discussed. Their common features are: purple soil <0 0 0 2mm colloidal particle The contents were less than the control soil in Guizhou --- yellow soil colloidal content; purple soil with more 2: 1 type clay minerals and interlayered minerals, containing less 1: 1 type clay minerals and colloidal containing more quartz. Control soil - yellow soil mainly contains 1: 1 clay minerals and quartz. The relationship between inorganic colloids and soil fertility was also analyzed.