本研究比较了云南、贵州和安徽等地的紫色土的有机 -无机复合体的组成和特点 ,它们的共同特点是 :紫色土的重组碳 (有机与无机复合量 )从剖面上部往下部均呈现下降趋势 ,而其有机无机复合度则呈现上升趋势 ;紫色土有机无机复合体含量在不同紫色土中差异很大 ;紫色土的G0 组、G1组和G2 组复合体的阳离子交换量有很大差别 ,紫色土的复合体 (G0 +G1+G2 )的阳离子交换量都小于相应紫色土阳离子交换量。紫色土的有机无机复合度普遍高于贵州的对照土壤———黄壤的有机无机复合度 ,云南和贵州紫色土的复合体的阳离子交换量大于贵州黄壤的复合体阳离子交换量。还分析了紫色土有机 -无机复合体与土壤肥力的关系。

This paper dealt with the composition and characteristics of organomineral colloidal complex of some purple soils from Yunnan, Guizhou and Anhui provinces and yellow soil from Guizhou. The common characteristics were that heavy C in the purple soils decreased from top to bottom in soil section. Degree of organomineral colloidal complex increased from top to bottom in soil section. The contents of organomineral colloidal complex of different purple soils were different . CEC of oragano2mineral colloidal complex of the purple soil medtioned above was higher than that of the yellow soil from Guizhou province. CEC of organomineral colloidal complex of the purple soils was less than of the same soils. Furthermore, the relationship between organo2mineral complex and fertility of purple soil was analysed.