白浆土形成过程中某些物理、化学性质的研究

白浆土发育在我国温带半湿润条件下,母质为第四纪河湖沉积物,土壤长期处于季节性干湿交替过程,使土壤剖面中铁、锰、铝等矿物元素被还原淋失,粘粒下移,在A及SB层中粘粒显著减少,淀积层中粘粒明显增加。整个剖面中硅铁率、硅铝率和硅铁铝率变化较小。土壤酸度稳定、盐基饱和度在70—90%。没有明显的矿物分解与灰化淀积层,在白浆化过程中,呈现了粘粒非破坏性的机械淋移,或者侧向漂洗作用。

STUDY ON THE PHYSICAL AND CHEMICAL PROPERTIES OF ALBIC SOILS IN THE FORMING PROCESSES

The albic soils (baijiantu) is develop.nent under semi-humid climate of temperate none in this country. They are commonly derived from Quaternary deposits. Due to periodically stagnancy of water under conditions of alternate seasonal wetness and dryness, the iron and manganese are reduced and leached off, the clay fraction is also leached downward, its amount apparently decreases in A and SB horizon, but increases in the B horizon. Silicon-iron, silicon-aluminium, and silicon-iron-aluminium ratios change insignificantly in the entire soil profile.The soil acidity is stable, the base saturation is high generally around 70-90%.