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首页> 外文期刊>Geomicrobiology journal >Microbial Communities Involved in Fe Reduction and Mobility During Soil Organic Matter (SOM) Mineralization in Two Contrasted Paddy Soils
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Microbial Communities Involved in Fe Reduction and Mobility During Soil Organic Matter (SOM) Mineralization in Two Contrasted Paddy Soils

机译：两种对比稻田土壤有机质（SOM）矿化过程中涉及的Fe还原和迁移的微生物群落

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Lowland rice fields of West Africa (Ivory Coast) and South Asia (Thailand) are affected by ferrous toxicity or salinity, respectively, and their soil waters contain large amounts of ferrous iron, depending on reducing irrigation condition and suggesting occurrence of bacterial reducing processes. To determine the involvement, dynamic and activities of bacterial communities in Fe(III) reduction and mobilization during anaerobic degradation and mineralization of soil organic matter (SOM), different experiments and analyses have been performed. Results demonstrated that the utilization of SOM as sole carbon, nutrient and energy sources favored the presence of large bacterial communities: facultative anaerobic and anaerobic bacteria, Fe(III)-reducing bacteria (FeRB) (fermentative and Fe respiring), sulfate reducing bacteria (SRB) which are involved in carbon, nitrogen, iron and sulfur cycling. The larger functional diversity is observed in the Ivory Coast paddy soils containing larger amounts of organic matter and sulfur compounds. These communities contained complementary populations (chemoorganotrophic, chemolitotrophic, aerobic, facultative anaerobic and anaerobic) that can be active at different steps of iron solubilization with simultaneous organic matter mineralization. Our results indicate that the pH controlled by bacterial activity, the nature much more than the content of organic matter, and consequently the structure and activity of bacterial communities influence significantly the availability and dynamic of iron in paddy fields which affect the soil quality.
机译：西非（象牙海岸）和南亚（泰国）的低地稻田分别受到亚铁毒性或盐分的影响，其土壤水中含有大量的亚铁，这取决于灌溉条件的减少和细菌减少过程的发生。为了确定厌氧降解和土壤有机质矿化过程中Fe（III）还原和迁移中细菌群落的参与，动态和活动，已进行了不同的实验和分析。结果表明，将SOM用作唯一的碳，营养和能量来源有利于存在大型细菌群落：兼性厌氧和厌氧细菌，Fe（III）还原菌（FeRB）（发酵和Fe呼吸），硫酸盐还原菌（ SRB），涉及碳，氮，铁和硫的循环。在含有大量有机物和硫化合物的象牙海岸稻田土壤中观察到较大的功能多样性。这些群落包含互补的种群（化肥，化肥，需氧，兼性厌氧和厌氧），这些种群可以在铁溶解的不同步骤中同时发生有机物矿化。我们的结果表明，pH值受细菌活性控制，其性质远大于有机物的含量，因此细菌群落的结构和活性显着影响稻田中铁的有效性和动态，从而影响土壤质量。

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