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Nat Commun:湿地既能生成甲烷、又能消耗甲烷

标签:淡水湿地 甲烷
摘要 : 本期Nature Communications上发表的一项研究显示,淡水湿地是甲烷的一个重要汇。湿地已知是大气中甲烷(一种强效温室气体)的最大自然来源,但它们也可能通过厌氧氧化将自己生成的多达50%的甲烷消耗掉。

本期Nature Communications上发表的一项研究显示,淡水湿地是甲烷的一个重要汇。湿地已知是大气中甲烷(一种强效温室气体)的最大自然来源,但它们也可能通过厌氧氧化将自己生成的多达50%的甲烷消耗掉。


Samantha Joye及同事研究了美国非常不同的地理区域(热带、温带和寒温带)的三个大型淡水湿地,并测定了厌氧氧化发生的速度。他们的结果表明,甲烷分解的速度大约是200垓克,这与海洋环境中的甲烷分解速度相似,肯定要比以前人们所想的高得多。



High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions


The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of atmospheric methane, is poorly constrained. Here we report rates of microbially mediated AOM (average rate=20 nmol cm−3 per day) in three freshwater wetlands that span multiple biogeographical provinces. The observed AOM rates rival those in marine environments. Most AOM activity may have been coupled to sulphate reduction, but other electron acceptors remain feasible. Lipid biomarkers typically associated with anaerobic methane-oxidizing archaea were more enriched in 13C than those characteristic of marine systems, potentially due to distinct microbial metabolic pathways or dilution with heterotrophic isotope signals. On the basis of this extensive data set, AOM in freshwater wetlands may consume 200 Tg methane per year, reducing their potential methane emissions by over 50%. These findings challenge precepts surrounding wetland carbon cycling and demonstrate the environmental relevance of an anaerobic methane sink in ecosystems traditionally considered strong methane sources.

来源: Nature 浏览次数:0


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