紫色土无机胶体与土壤肥力

Relationship between Inorganic Colloid and Fertility of Purple Soil

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。

This paper deals with the content of colloidal particle and the clay mineral compositions of the purple soils from Yunnan, Guizhou and Anhui provinces. The common characteristics are as follows: the content of colloidal particle (<0.002?mm) of the purple soils is lower than that of CK (the yellow soil from Guizhou province); the purple soils contain more of 2∶1 clay mineral and less of 1∶1 clay mineral; the colloidal particle contains more Quartz. While the yellow soils mainly contain 1∶1 clay mineral and Quartz. Furthermore, the relationship between inorganic colloid and soils fertility is analyzed.