Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
Small thaw ponds: an unaccounted source of methane in the Canadian high Arctic.
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DOI：
10.1371/journal.pone.0078204
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Lovejoy C
中科院分区：
文献类型：
--
作者：
Negandhi K;Laurion I;Whiticar MJ;Galand PE;Xu X;Lovejoy C
加拿大北极冻土带的永久冻土带融化导致泥炭侵蚀，并在更常研究的多角形池塘周围的狭窄而浅的水道池塘中塌陷。本文利用稳定同位素比值、14C特征比较了流型池和多面体池的甲烷产量，并通过高通量古菌16S rRNA基因测序研究了潜在的产甲烷群落。我们发现，与多角形池塘相比，流线型池塘的甲烷和二氧化碳排放量明显更高，这些甲烷和二氧化碳是由稍大一部分的旧碳产生的。甲烷稳定同位素特征表明产甲烷的方式为丙酮碎屑生甲烷，但在多角形和流型池塘中均检测到丙酮碎屑生甲烷和氢营养型生甲烷古菌的基因特征。我们得出的结论是，径流池代表了可能来自更古老的C的甲烷来源，并且它们包含能够利用多种碳源的产甲烷群落，增加了气候变暖下甲烷释放增加的风险。
Thawing permafrost in the Canadian Arctic tundra leads to peat erosion and slumping in narrow and shallow runnel ponds that surround more commonly studied polygonal ponds. Here we compared the methane production between runnel and polygonal ponds using stable isotope ratios, 14C signatures, and investigated potential methanogenic communities through high-throughput sequencing archaeal 16S rRNA genes. We found that runnel ponds had significantly higher methane and carbon dioxide emissions, produced from a slightly larger fraction of old carbon, compared to polygonal ponds. The methane stable isotopic signature indicated production through acetoclastic methanogenesis, but gene signatures from acetoclastic and hydrogenotrophic methanogenic Archaea were detected in both polygonal and runnel ponds. We conclude that runnel ponds represent a source of methane from potentially older C, and that they contain methanogenic communities able to use diverse sources of carbon, increasing the risk of augmented methane release under a warmer climate.
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