Global prevalence of methane oxidation by symbiotic bacteria in peat-moss ecosystems
Global prevalence of methane oxidation by symbiotic bacteria in peat-moss ecosystems
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DOI：
10.1038/ngeo939
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发表时间：
2010-09-01
影响因子：
18.3
通讯作者：
Op den Camp, Huub J. M.
中科院分区：
文献类型：
--
作者：
Kip, Nardy;van Winden, Julia F.;Op den Camp, Huub J. M.
泥炭沼泽储存了地球上所有陆地碳的三分之一（1），并且是大气甲烷的最大天然来源之一（2）。全球泥炭沼泽中普遍存在的沉水泥炭藓类的厌氧降解在这些系统中产生大量的甲烷。然而，荷兰对泥炭藓的一项研究表明，大部分甲烷被称为甲烷氧化菌的好氧甲烷氧化细菌消耗（3）;作为回报，甲烷氧化菌为泥炭藓提供碳（3）。在这里，我们表明，泥炭相关的甲烷氧化发生无处不在的地球仪。我们收集了泥炭藓从水池，草坪和在世界各地的9个泥炭藓占主导地位的泥炭地的小丘，并测量了它们的能力，氧化甲烷在一系列的实验室培养。所有苔藓都能氧化甲烷。甲烷氧化的速率随温度的升高而增加，在泥炭地池中收集的沉水苔藓中最为明显。根据DNA微阵列分析，负责甲烷氧化的甲烷氧化菌群落是高度多样性的。C-13标记显示，甲烷衍生的碳被纳入植物脂质时，苔藓被淹没，指示苔藓和甲烷氧化菌之间的互利共生。我们的研究结果表明，甲烷氧化菌和泥炭藓之间的相互作用可能在碳循环中发挥作用，在水涝泥炭藓植被，潜在地减少甲烷排放。
Peat bogs store up to a third of all terrestrial carbon on Earth(1), and are one of the largest natural sources of atmospheric methane(2). Anaerobic degradation of submerged Sphagnum species-mosses that are prevalent in peat bogs across the globe-produces significant quantities of methane in these systems. However, a study on peat mosses in the Netherlands revealed that a large fraction of this methane is consumed by aerobic methane-oxidizing bacteria, known as methanotrophs(3); in return, the methanotrophs provide Sphagnum mosses with carbon(3). Here, we show that Sphagnum-associated methane oxidation occurs ubiquitously across the globe. We collected Sphagnum mosses from pools, lawns and hummocks in nine Sphagnum-dominated peatlands across the world, and measured their capacity to oxidize methane in a series of laboratory incubations. All mosses were capable of oxidizing methane. The rate of methane oxidation increased with temperature, and was most pronounced in submerged mosses, collected from peatland pools. According to DNA microarray analyses, the methanotrophic community responsible for methane oxidation was highly diverse. C-13 labelling revealed that methane-derived carbon was incorporated into plant lipids when mosses were submerged, indicative of a mutually beneficial symbiosis between mosses and methanotrophs. Our findings suggest that the interaction between methanotrophs and Sphagnum mosses may play a role in carbon recycling in waterlogged Sphagnum vegetation, potentially reducing methane emissions.