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Incubation experiments were conducted to investigate the dynamics of low- molecufar-weight aliphatic acids in two andosols with and without plant materials. Results showed that amount of low- molecular-weight aliphatic acids in soils alone varied considerably with water regime under which the soil was incubated,duration of incubation and soil organic matter content, ranging from 257-860 pmol kg-1 soil I of which 19%～33% was in free state. Incorporation of plant materials increased greatly both the amount and number of members of low- molecular- weight aliphaticacidst and also the proporticn of low-molec “far-weight aliphatic acids occurred in free state. Generally, among these aliphatic acids detected, acetic, propionic, glyoxalic and formic acids were predominant.
Incubation experiments were conducted to investigate the dynamics of low- molecularfar-weight aliphatic acids in two andosols with and without plant materials. Results showed that amount of low- molecular-weight aliphatic acids in soils alone varied with water regime under which the soil was. incubation, duration of incubation and soil organic matter content, ranging from 257-860 pmol kg-1 soil I of 19% -33% was in free state. Incorporation of plant materials increased greatly both the amount and number of members of low- molecular-weight aliphaticacidst and also the proporticn of low-molec ”far-weight aliphatic acid occurred in free state. Generally, among these aliphatic acids detected, acetic, propionic, glyoxalic and formic acids were predominant.