摘要
水稻土是甲烷产生的重要源地 .厌氧条件下甲烷的形成与有机质厌氧降解产生的乙酸、H2 和CO2 有关 .氧化铁作为电子受体可有效地竞争有机质向甲烷的转化 ,其抑制作用机理可能与乙酸、H2 和CO2 的有效消耗有关 .通过向水稻土泥浆中添加无定形氧化铁和纤铁矿 ,分别测定了 2 5℃厌氧恒温培养1 0 5d过程中的H2 、CO2 和CH4 的浓度变化 .结果表明 ,添加无定形氧化铁及纤铁矿可导致H2 浓度显著降低 ;无定形氧化铁对H2 消耗的影响明显大于纤铁矿 ;添加不同氧化铁对CO2 浓度的影响与H2 浓度的变化有相同的趋势 ;添加氧化铁能显著抑制水稻土中甲烷形成 ,并导致有机碳的转移发生变化 ,使得CH4 C显著降低 ,气相中CO2 C量减少 ,而由土壤泥浆固定的CO32 -
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 H 2 and CO 2. After added ferrihydrite and lepidocrocite, the H 2, CO 2 and CH 4 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 H 2, CO 2 and CH 4, and ferrihydrite had a stronger effect than lepidocrocite. In this system, the balance of organic C was disturbed, CH 4 C and CO 2 C were reduced, but the CO 3 2- C fixed by slurry was greatly increased.
出处
《应用生态学报》
CAS
CSCD
2003年第8期1313-1316,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目(40 14 10 0 54 0 2 710 6 7)
关键词
水稻土
甲烷形成
氧化铁
氢
二氧化碳
Paddy soil, Methanogenesis, Iron oxide, Hydrogen, Carbon dioxide.
