Suppression of Methanogenesis by Microbial Reduction of Iron-Organic Carbon Associations in Fully Thawed Permafrost Soil

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
E. Voggenreiter, L. ThomasArrigo, M. Bottaro, J. Kilian, D. Straub, F. Ring-Hrubesh, C. Bryce, M. Stahl, A. Kappler, P. Joshi
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Abstract

Global methane (CH4) emissions from thawing permafrost peatlands are expected to increase substantially in the future. Net emission of CH4 depends on the presence of more favorable terminal electron acceptors for microbial respiration, such as ferric iron (Fe(III)). In soils with high OC content, Fe(III) is often coprecipitated with organic carbon (OC). The presence of Fe(III)-OC coprecipitates could either suppress CH4 emissions due to inhibition of methanogenesis and stimulation of anaerobic methane oxidation coupled to Fe(III) reduction, or enhance emissions by providing additional OC. Here, we investigated the role of Fe(III)-OC coprecipitates in net CH4 release in a fully thawed, waterlogged permafrost peatland (Stordalen Mire, Abisko, Sweden). We synthesized Fe(III)-OC coprecipitates using natural organic matter from the field site and added them to waterlogged soil in a microcosm experiment and in situ, and followed Fe speciation and changes in greenhouse gas emissions over time. Fe(III)-OC coprecipitates were partially reduced (22%) within 42 days in the microcosm experiment, while almost full reduction (92 ± 4%) occurred in situ within 53 days. This led to a decrease in CH4 emissions by 94% and 40% in the microcosm and field experiments, respectively, compared to no-coprecipitate controls. A decrease in both RNA-based mcrA copy numbers and relative abundance of detected methanogens indicated that methanogenesis was mainly inhibited by the addition of the coprecipitates due to microbial Fe(III) reduction. In conclusion, Fe(III)-OC coprecipitates temporarily suppress net CH4 emissions in fully thawed permafrost soils, and might play a similar role in mitigating CH4 release in other (periodically) flooded soils.

Abstract Image

冻土区完全解冻土壤微生物还原铁-有机碳结合对甲烷生成的抑制
预计未来全球永久冻土泥炭地融化产生的甲烷(CH4)排放量将大幅增加。CH4的净排放取决于对微生物呼吸更有利的终端电子受体的存在,如铁(Fe(III))。在OC含量高的土壤中,Fe(III)常与有机碳(OC)共沉淀。Fe(III)-OC共沉淀物的存在既可以通过抑制甲烷生成和刺激厌氧甲烷氧化以及Fe(III)还原来抑制CH4排放,也可以通过提供额外的OC来增加排放。在这里,我们研究了Fe(III)-OC共沉淀物在完全融化、水浸的永久冻土泥炭地(瑞典阿比斯库的Stordalen沼泽)净CH4释放中的作用。利用野外天然有机质合成Fe(III)-OC共沉淀物,并通过微观实验和原位试验将其添加到涝渍土壤中,跟踪了Fe形态和温室气体排放随时间的变化。在微观实验中,Fe(III)-OC共沉淀在42天内部分还原(22%),而在53天内几乎完全还原(92±4%)。与无共沉淀对照相比,这导致微观和田间试验中CH4排放量分别减少了94%和40%。基于rna的mcrA拷贝数和检测到的产甲烷菌的相对丰度都有所下降,这表明产甲烷主要受到微生物Fe(III)还原引起的共沉淀物的抑制。综上所述,Fe(III)-OC共沉淀暂时抑制了完全融化的永久冻土中CH4的净排放,并可能在其他(周期性)淹水土壤中发挥类似的作用。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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