我国黑龙江和吉林两省东部及其毗邻的苏联远东如伯力、沿海边区和阿穆尔州等地广泛分布着一种具有白色亚表层的土壤,我国当地农民称之为白浆土.关于这种土壤的形成过程问题,从К.Д.Глинка(1910)和В.А.Балъц、Б.Б.Полынов(1930)开始研究苏联远东和我国东北地区的土壤以来,中苏两国大多数土壤学家一直认为是灰化过程,称之为灰化土或生草灰化土.

A special soil group,characterized by a white subsurface and a chayly subsoil,is widely distributed in the east part of the Heilungkiang and Chilin provinces of Northeast China.This soil group has been described previously by some authors as podzolic and soddy-podzolic soils or solodi.A more systematic investigation of the soils by the present authors,both in field and laboratory,comes to the conclusions that the genesis of this soil group is of a hydromorphous bleached process developed periodically under the influence of temporary stagnation of soil water at the surface horizon.The Paichiang soils,according to the denomination of natives,should be regarded as a special group of hydromorphic soils and are tentatively subdevided into three subgroups-the Paichiang soil,the meadow-Paichiane soil and the glei-Paichiang soil.