Methane emission suppression in flooded soil from Amazonia
Methane emission suppression in flooded soil from Amazonia
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DOI：
10.1016/j.chemosphere.2020.126263
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发表时间：
2020-07-01
期刊：
影响因子：
8.8
通讯作者：
Navarrete, Acacio A.
中科院分区：
文献类型：
--
作者：
Gabriel, Gabriele V. M.;Oliveira, Luciana C.;Navarrete, Acacio A.
亚铁和甲烷生产之间的耦合具有重要的全球影响，铁离子充当甲烷厌氧氧化（AOM）的电子受体和不同环境（包括洪泛区土壤）中产甲烷作用的抑制剂。从这个意义上说，我们分析了在厌氧间歇式反应器中使用乙酸盐、甲酸盐和葡萄糖作为有机源培养的亚马逊清水漫滩的淹没森林和农林业中收集的 0-15 厘米和 15-30 厘米土层中 Fe(II) 浓度与甲烷产量之间的关系。采用古菌和细菌 16S rRNA 基因的高通量测序来评估用作接种物的土壤中可能参与 Fe(III) 依赖性 AOM 的活性产甲烷和甲烷氧化微生物群的丰度和组成。 Fe(II) 浓度与甲烷产量之间存在正相关关系，所有三种有机源在森林和农林业场所 0-15 cm 处收集的培养土层中 Fe(II) 积累量较高。培养土壤中 Fe(II) 的积累证明了生活在该土壤层厌氧条件下的甲烷杆菌、Desulfobulbus 和“Candidatus methanoperedens nitroreducens”可能对 Fe(III) 进行氧化。结果指出，微生物三价铁还原是亚马逊洪泛区厌氧有机物分解的重要潜在途径，证明了亚马逊清水河洪泛区的水淹林和农林业中 Fe(III) 还原抑制了产甲烷作用。 (C) 2020 Elsevier Ltd. 保留所有权利。
The coupling between ferrous iron and methane production has important global implications, with iron ions acting as electron acceptors for anaerobic oxidation of methane (AOM) and inhibitors of methanogenesis in different environments, including floodplain soils. In this sense, we analyzed the relationship between Fe(II) concentration and methane production in soil layers collected at 0-15 cm and 15-30 cm from flooded-forest and -agroforestry in Amazonian clear water floodplain incubated in anaerobic batch reactors using acetate, formate and glucose as organic sources. High throughput sequencing of archaeal and bacterial 16S rRNA genes was employed to assess the abundance and composition of the active methanogenic and methanotrophic microbial groups potentially involved in Fe(III)-dependent AOM in the soil used as inoculum. Positive correlation was revealed between Fe(II) concentration and methane production, with higher accumulation of Fe(II) in incubated soil layer collected at 0-15 cm in both forest and agroforestry sites for all the three organic sources. The accumulation of Fe(II) in the incubated soil evidenced the oxidation of Fe(III) potentially by Methanobacterium, Desulfobulbus and 'Candidatus methanoperedens nitroreducens' living in anaerobic condition at this soil layer. The results point out to the microbial ferric iron reduction as an important potential pathway for anaerobic organic matter decomposition in Amazonian floodplain, evidencing methanogenesis suppression by Fe(III) reduction in flooded-forest and -agroforestry in Amazonian clear water river floodplain. (C) 2020 Elsevier Ltd. All rights reserved.