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Regulation of coastal methane sinks by a structured gradient of microbial methane oxidizers

机译：通过结构化的甲烷甲烷氧化剂梯度调节沿海甲烷汇

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Coastal wetlands are widely recognized as atmospheric methane sources. However, recent field studies suggest that some coastal wetlands could also act as methane sinks, but the mechanism is not yet clear. Here, we investigated methane oxidation with different electron acceptors (i.e., oxygen, nitrateitrite, sulfate, Fe(III) and Mn(IV)) in four coastal wetlands in China using a combination of molecular biology methods and isotopic tracing technologies. The geochemical profiles and in situ Gibbs free energies suggest that there was significant nitrite-dependent anaerobic oxidation of methane (nitrite-AOM) in the sub-surface sediments; this was subsequently experimentally verified by both the microbial abundance and activity. Remarkably, the methanotrophic communities seemed to exist in the sediments as layered structures, and the surface aerobic methane-oxidizing bacteria were able to take up atmospheric methane at a rate of 0.10-0.18 nmol CH4 day(-1) cm(-2), while most, if not all, sedimentary methane was being completely consumed by anaerobic methanotrophs (23-58% by methane oxidizers in phylum NC10). These results suggest that coastal methane sinks might be governed by diverse microbial communities where NC10 methane oxidizers contributed significantly. This finding helps to better understand and predict the coastal methane cycle and reduce uncertainties in the estimations of the global methane flux. (C) 2018 Elsevier Ltd. All rights reserved.
机译：沿海湿地被广泛认为是大气中的甲烷源。但是，最近的野外研究表明，一些沿海湿地也可以充当甲烷汇，但机制尚不清楚。在这里，我们结合分子生物学方法和同位素示踪技术，研究了中国四个沿海湿地中不同电子受体（即氧气，硝酸盐/亚硝酸盐，硫酸盐，Fe（III）和Mn（IV））的甲烷氧化。地球化学特征和原位吉布斯自由能表明，地下沉积物中甲烷具有明显的亚硝酸盐依赖性厌氧氧化甲烷（亚硝酸盐-AOM）。随后通过微生物丰度和活性进行了实验验证。值得注意的是，甲烷营养菌群落似乎以分层结构存在于沉积物中，并且表面好氧甲烷氧化细菌能够以0.10-0.18 nmol CH4天（-1）cm（-2）的速率吸收大气甲烷，大部分（如果不是全部）沉积甲烷被厌氧甲烷营养生物完全消耗（NC10门类中甲烷氧化剂占23-58％）。这些结果表明，沿海甲烷汇可能是由各种微生物群落控制的，NC10甲烷氧化剂在其中发挥了重要作用。这一发现有助于更好地理解和预测沿海甲烷循环，并减少全球甲烷通量估算中的不确定性。 （C）2018 Elsevier Ltd.保留所有权利。

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