Influence of iron and aluminium oxide on the amount of microbial biomass and decomposition of rice straw in H2O2-treated soil
1999
Guan, G. (Yamaguchi Univ. (Japan). Faculty of Agriculture) | Marumoto, T. | Nishiyama, M.
In order to investigate the influence of iron and aluminium oxide on microbial biomass in volcanic ash soils, we examined the relationships between the amounts of soil microbial biomass, evolved carbon dioxides and free iron and aluminium oxides. Eight soils were treated with H2O2 to remove organic matter, sterilized, inoculated with nonsterile soil, and incubated for 98 days with or without the addition of rice straw. The results obtained are as follows. The amount of soil organic C was decreased, while the amounts of free iron and aluminiumoxides were increased by treatment with H2O2. The amount of "stable" microbial biomass held in the soil at the latter period of incubation was also decreased. Therefore, it was suggested that soil organic matter could increase the amount of stable microbial biomass. Furthermore, within H2O2-treated soils, a negative correlation was obtained between the amount of evolved carbon dioxide and the amount Of stable microbial biomass and the amount of free aluminium oxides, suggesting that free aluminium oxides retard the decomposition of organic matter by soil micro-organisms and reduce the amount of stable microbial biomass
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