Ubiquitous and significant anaerobic oxidation of methane in freshwater lake sediments
Ubiquitous and significant anaerobic oxidation of methane in freshwater lake sediments
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DOI：
10.1016/j.watres.2018.07.053
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发表时间：
2018-11-01
期刊：
影响因子：
12.8
通讯作者：
Thalasso, Frederic
中科院分区：
文献类型：
--
作者：
Martinez-Cruz, Karla;Sepulveda-Jauregui, Armando;Thalasso, Frederic
甲烷厌氧氧化（AOM）是一种微生物作用过程，它消耗缺氧沉积物和土壤中的溶解甲烷（CH 4），减少CH 4向大气的释放。AOM在多大程度上限制了全球生物圈的CH 4排放量，这一点还没有得到充分的了解。在海洋沉积物中，这一过程首次被描述，AOM负责氧化超过90%的CH 4。最近，AOM在土壤、泥炭地和淡水生态系统中被观察到。在湖泊中，沉积物缺氧，有机碳周转和CH 4生产是常见的，AOM没有得到很好的研究，但可能是一个重要的CH 4汇和限制排放。在这里，我们提出的证据AOM发生在沉积物中的13个湖泊，跨越全球气候和营养梯度。我们进一步量化和模拟AOM模式，并研究了潜在的微生物控制AOM使用实验室培养的沉积物和稳定同位素测量的十三个湖泊。我们表明，AOM是广泛存在于淡水湖泊沉积物中，占29%-34%（95%置信区间）的平均总CH 4产生的地表和近地表湖泊沉积物。(C)2018爱思唯尔有限公司版权所有
Anaerobic oxidation of methane (AOM) is a microbial process that consumes dissolved methane (CH4) in anoxic sediments and soils and mitigates CH4 release to the atmosphere. The degree to which AOM limits global biospheric CH4 emissions is not fully understood. In marine sediments, where the process was first described, AOM is responsible for oxidizing >90% of the CH4 produced. More recently, AOM has been observed in soils, peatlands, and freshwater ecosystems. In lakes, where sediment anoxia, organic carbon turnover, and CH4 production are common, AOM is not well studied but could represent a significant CH4 sink and constraint on emissions. Here, we present evidence for the occurrence of AOM in the sediment of thirteen lakes that span a global climatic and trophic gradient. We further quantified and modeled AOM patterns and studied potential microbial controls of AOM using laboratory incubations of sediment and stable isotope measurements in three of the thirteen lakes. We demonstrate that AOM is widespread in freshwater lake sediments and accounts for 29%-34% (95% confidence interval) of the mean total CH4 produced in surface and near-surface lake sediments. (C) 2018 Elsevier Ltd. All rights reserved.