Methanogenesis affected by the co-occurrence of iron(III) oxides and humic substances.
Methanogenesis affected by the co-occurrence of iron(III) oxides and humic substances.
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DOI：
10.1111/1574-6941.12274
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发表时间：
2014-04
影响因子：
4.2
通讯作者：
Shungui Zhou;Jielong Xu;Guiqin Yang;Zhuang Li
中科院分区：
文献类型：
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作者：
Shungui Zhou;Jielong Xu;Guiqin Yang;Zhuang Li
铁氧化物和腐殖物质（腐殖物质）由于其氧化还原反应性和普遍存在，对生物化学过程（如甲烷生成）具有重大影响。这项研究的目的是调查甲烷是如何影响这些化合物的常见发生，这还没有被认为是迄今为止。实验进行缺氧水稻土微宇宙接收腐殖酸替代化合物（蒽醌-2，6-二磺酸盐，AQDS）和三个铁（III）氧化物（水铁矿，赤铁矿，磁铁矿）不同的结晶度和导电性。Ferrihydrate抑制甲烷，而AQDS，赤铁矿，磁铁矿促进甲烷。在共生的水铁矿+ AQDS，赤铁矿+ AQDS，磁铁矿+ AQDS文化的CH 4生产分别为4.1，1.3和0.9倍以上的相应的文化没有AQDS，分别。在产甲烷促进培养物中，Gesterol和Methanosarcina之间发生了互养合作。实验结果表明，铁（III）氧化物的导电特性是一个重要的因素，确定产甲烷反应的铁（III）氧化物和腐殖酸在厌氧水稻土共存。这项工作表明，铁（III）氧化物的类型可能会显着影响天然湿地缺氧条件下的碳循环。
Iron oxides and humic substances (humics) have substantial effects on biochemical processes, such as methanogenesis, due to their redox reactivity and ubiquitous presence. This study aimed to investigate how methanogenesis is affected by the common occurrence of these compounds, which has not been considered to date. The experiment was conducted with anoxic paddy soil microcosms receiving a humics surrogate compound (anthraquinone-2,6-disulfonate, AQDS) and three iron(III) oxides (ferrihydrite, hematite, and magnetite) differing in crystallinity and conductivity. Ferrihydrite suppressed methanogenesis, whereas AQDS, hematite, and magnetite facilitated methanogenesis. CH4 production in co-occurring ferrihydrite + AQDS, hematite + AQDS, and magnetite + AQDS cultures was 4.1, 1.3, and 0.9 times greater than the corresponding cultures without AQDS, respectively. Syntrophic cooperation between Geobacter and Methanosarcina occurred in the methanogenesis-facilitated cultures. Experimental results suggested that the conductive characteristics of iron(III) oxides was an important factor determining the methanogenic response to the co-occurrence of iron(III) oxides and humics in anaerobic paddy soil. This work indicated that the type of iron(III) oxides may significantly affect carbon cycling under anoxic conditions in natural wetlands.