Studies on the Factors Affecting the Formation and Stabilization of Soil Aggregate

Abstract

In 10 plots differing in land utilization, surface soils were sampled every four seasons from 1990 to 1991 and 6 items including 18 factors which may affect the formation and stabilization of soil aggregate were examined.
As a result of this research, using a canonical correlation and time series analyses, the following results were obtained:
1) Factors concerned with items for aggregate and three phases of soil did change with alterations in land use.
2) Biological activity of soil, aluminium content and organic matter content in soil had an influence on the formation and stabilization of soil aggregate.
3) It seems very probable that seasonal changes in the degree of aggregation and mass diameter of aggregate was caused by the biological activity in the soil, which changed remarkably with temperature. Therefore, application of organic matter and inorganic matter, including Al, in spring may be successful in forming and stabilizing the soil aggregate.