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发育在我国南方亚热带季风气候地区的第四纪红色粘土母质上的红壤早已为人们所注意。这是一类粘粒主要由结晶度不甚高的高岭石以及铝蛭石、伊利石，针铁矿所组成，具有一定脱硅富铝化程度且粘重的土壤．本文以微形态学方法对一个这类土壤剖面（江西余江）进行了详细研究．结果表明：该剖面微形态的演变主要表现在细粒物质及微结构特征的变化两方面。这些变化似乎与土体内的水分状况变化及因而引起的粘粒物质移动有关．令人感兴趣的是：在红色心土层的中上部（Ｂ１层）可观察到典型的微团聚化现象，说明这一过程不仅仅为热带湿润地区高度发育的铁铝土所特有，而且在北亚热带季风气候条件下发育的红壤中同样也有发生。
Red soil developed in the Quaternary red clay parental material in the subtropical monsoon climate region of southern China has long been noticed. This is a class of clay mainly composed of kaolinite with less crystallinity and aluminum vermiculite, illite and goethite, which has a certain degree of desilication and heavy clay. In this paper, a micro-morphological approach to such a soil profile (Jiangxi Yujiang) conducted a detailed study. The results show that the evolution of the micromorphology of the section is mainly manifested in the changes of the characteristics of fine-grained materials and microstructures. These changes seem to be related to changes in the soil moisture conditions and the resulting movement of the cosmotropic material. Interestingly, typical micrometasta- tion was observed in the middle and upper part of the red core soil (layer B1), indicating that this process is not unique to the highly developed ferroalloys in the tropics but also to The same is true of the red soils developed under the northern subtropical monsoon climate.