CAJ | 학술논문

宣城第四纪红色粘土14层土体硅铝率、风化淋溶系数，以及阳离子交换量、盐基饱和度和粘粒含量等风化、成土作用指标表明，该剖面各层次之间仅显示出一定程度沉积作用和成土作用的差别。它们是边沉积边成土作用的产物。上覆lm左右厚下蜀黄土，且由均质红土层、铁锰焦斑层和网纹层构成的宣城第四纪红色粘土应归属于埋藏类型古土壤。
선성제사기홍색점토14층토체규려솔、풍화림용계수，이급양리자교환량、염기포화 도화점립함량등풍화、성토작용지표표명，해부면각층차지간부현시출일정정도침적작용화성토작용적차별。타문시변침적변성토작용적산물。상복lm좌우후하촉황토，차유균질홍토층、철맹초반층화망문층구성적선성제사기홍색점토응귀속우매장류형고토양。
A section of Quaternary red clay, located in Xuancheng, Anhui province, isrecognized a typical and good one for the study of red paleosols in the southem partof China. It was divided in earlier studies into 14 layers (7 formations) except a gravelformation in the bottom. Each formation consists of a "red layer" ("red paleosol") andtmderlying "brown-yellow layer"("deposit"). To elucidate its characteristics of developm-ent, main chemical and physical properties for 14 layers of the section were analyzed. The results indicated that the silica content in each "red layer" was not always lessthan that in the underlying "brown-yellow layer", and the contents of aluminum andclay in each of the "red paleosols" were not more than those in the corresponding"sedimentary layer", respectively. In the same way, other research data also hadanalogous phenomena. Based on the indexes of weathering and soil formation, includingsilica-aluminum milo, indexes of weathering and leaching, cation exchange capacity,base saturation, as well as the clay content, we conclude that there were no regularcycles between soil formation of "red layer" and deposition of "brown-yellow layer" inthe section. In fact, each layer of the "red paleosols" didn′t develop from the underlying"brown-yellow sedimentary layer". Each of the 14 layers within the profile only tocertain extent showed its difference of deposition and soil formation. Moreover,pedogenesis was sometimes weaker, sometimes stronger than the sedimentation. On thebasis of these characteristics, the authors think that these are buried red paleosols,which consist of uniform red soil, iron-manganese illuvial, plinthiilc horizons, andoverlain by a yelloW-brown horizon derived from the Xiashu Loess.