Effect of iron oxide addition on hydrogen, carbon dioxide and methane geneses in paddy soil

Abstract

Abstract: Paddy soil is an important contributor for atmospheric methane. The methanogenesis is related to the production of acetate, hydrogen and carbon dioxide during the decomposition of organic matter under anaerobic conditions. As electron acceptors, iron (Ⅲ) oxides can effectively compete with electrons in the transformation of organic matter into methane. Its mechanism maybe relates to the consumption of H₂ and CO₂. After added ferrihydrite and lepidocrocite, the H₂, CO₂ and CH₄ were determined during the anaerobic incubation of slurries at 25 ℃ for 105 days. The results indicated that the addition of ferrihydrite and lepidocrocite could greatly decrease the concentration of H₂, CO₂ and CH₄, and ferrihydrite had a stronger effect than lepidocrocite. In this system, the balance of organic-C was disturbed, CH₄-C and CO₂ Cwere reduced, but the CO₃^2--C fixed by slurry was greatly increased.

Key words: Paddy soil, Methanogenesis, Iron oxide, Hydrogen, Carbon dioxide

CLC Number:

S151.9

QU Dong, ZHANG Yiping, S. Schnell, R. Conrad . Effect of iron oxide addition on hydrogen, carbon dioxide and methane geneses in paddy soil[J]. Chinese Journal of Applied Ecology, 2003, (8): 1313-1316.

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