【摘要】 <正> 鄂北豫西南的漫岗平原和平缓丘陵上,广泛分布着上更新统黄土（Q₃）上发育的土壤。在中国土壤图（1976年）,中国土壤和土壤分区图（1981年）,划为粘盘黄棕壤或黄褐土。以往有关这类土壤的研究报道,多以苏、皖的粘盘黄棕壤为对象。近年来,笔者结合鄂北土壤普查,对鄂北豫西南的黄褐土进行了一些考察研究。本文就黄褐土的某些发生学特征,及其与鄂中下蜀黄土上发育的土壤（称为典型黄棕壤,简称黄棕壤）的差别,并对它在土壤分类中的地位,提出一些看法,以供讨论。更多还原

【Abstract】 This paper deals with some genetic properties of the yellow cinnamon soil in North Hubei Southwest Henan province and their place in classification of soils.The yellow cinnamon soil is distributed far and wide in hummock fossil plain, fluvial terrace and low hills in North Hubei and Southwest Henan province, the most parent material is loess like deposit which formed in late pleistocene （Q₃ or called Xia-shu loess）. This type of soil is formed under the change region of climate from humid region to semi-humid region in north subtropical region. It is one of subgroups of yellow brown earth that is north subtropical zonal group soil.The main genetic properties of the soil are summarized as follows:（1） The soil pH（H₂O） between 6.7—7.5, base-saturation>80%, calcium saturation>50%, but non-reaction of calcareous on whole profile.（2） The soil allitic process in yellow cinnamon soil occurred in weak degree. The ratio of SiO₂/Al₂O₃ and SiO₂/R₂O₃ of the clay fraction is 3.22 and 2.45 respectively. T main clay mineral are hydrous mica,vermiculite and kaolinite. The CEC of clay fraction of B horizon about 50me/100g, cday-activity is around 22. Free degree of iron oxides ranged 30—35%.（3） Heavy texture on whole soil profile, the clay （<0.005mm particle） contents>45%.The clay contents in the illuvial horizon is slightly increase. It is supposed inherited from parent material.更多还原