摘要
甲烷(CH_(4))和氧化亚氮(N_(2)O)是重要的温室气体,增温潜势极强,因此研究温室气体CH_(4)和N_(2)O的减排对全球碳氮循环具有重要意义.在介绍甲烷厌氧氧化(AOM)的主要过程基础上,重点综述了3种反硝化型甲烷厌氧氧化反应(NO_(3)^(-)/NO_(2)^(-)、N_(2)O)驱动AOM的途径、相关微生物及其影响因素.NO_(3)^(-)驱动型AOM主要是由Candidatus Methanoperedens nitroreducens通过甲基辅酶M还原酶(Mcr)进行的反向产甲烷途径;NO_(2)^(-)驱动型AOM则为Candidatus Methylomirabilis oxyfera通过甲烷单加氧酶(p MMO)进行的内需氧型甲烷氧化途径.关于NO_(3)^(-)/NO_(2)^(-)驱动AOM的影响因素研究主要为环境特性、土壤深度、植被类型、甲烷、电子受体等,其中对于M.nitroreducens影响的研究较少.除此之外,最新发现还存在N_(2)O耦合的CH_(4)厌氧氧化途径,且该途径是通过在N_(2)^(-)的存在下产生的内需氧型甲烷氧化途径进行的,类似于M.oxyfera的细菌可能参与了N_(2)^(-)驱动的AOM过程.目前NO_(3)^(-)/NO_(2)^(-)驱动型AOM途径的影响因素需进行更加深入的研究与探讨;最新研究发现的N_(2)O驱动型AOM途径的相关微生物、机制、氧化潜势、影响因素有待继续深入研究.
Methane(CH_(4))and nitrous oxide(NO_(2)^(-))are important greenhouse gases,each with strong warming potentials.Therefore,it is critical to study the various mechanisms of reducing these greenhouse gases(CH_(4) and NO_(2)^(-))in global carbon and nitrogen cycles.Herein,the main processes of anaerobic methane oxidation(AOM)are introduced and the pathways,relevant microorganisms,and factors influencing three kinds of denitrifying anaerobic methane oxidation reactions(NO_(3)^(-)/_(2)^(-)-and NO_(2)^(-) driven AOM)are reviewed.NO_(3)^(-)driven AOM is principally a reverse methane-producing pathway in Candidatus Methanoperedens nitroreducens via methylcoenzyme M reductase(MCR).NO_(2)^(-)-driven AOM is a domestic oxygen-type methane oxidation pathway in Candidatus Methylomirabilis oxyfera through particulate methane monooxygenase(p MMO).Studies assessing factors which influence NO_(3)^(-)/NO_(2)^(-)-driven AOM mainly include environmental characteristics,such as soil depth and vegetation type,as well as methane,and electron acceptors.Few studies have investigated the influence of M.nitroreducens.In addition,recent studies has also shown the existence of NO_(2)^(-) consumption and the CH4anaerobic oxidation pathway,which was carried out through the domestic oxygen-type methane oxidation pathway generated in the presence of NO_(2)^(-).Furthermore,the bacteria were found to be similar to M.oxyfera,which may participate in the N_(2)O driven AOM process.At present,the factors influencing NO_(3)^(-)-/NO_(2)^(-)-driven AOM need further investigation.In addition,recent literature detailing the relevant microorganisms,mechanisms,oxidation potential,and factors influencing NO_(2)^(-) driven AOM needs further assessment.
作者
陈悦
罗明没
毛娇艳
李玮
胡斌
CHEN Yue;LUO Mingmo;MAO Jiaoyan;LI Wei;HU Bin(Yunnan Key Laboratory of Plateau Mountain Ecology and Degraded Environment Remediation,College of Ecology and Environment,Yunnan University,Kunming 650091,China;Environmental Protection Research Institute of Guanxi Transportation Science and Technology Group Co.Ltd.,Nanning 530000,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第6期1686-1693,共8页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(31700411)
云南省应用基础研究计划项目(2018FD007)资助。
关键词
甲烷厌氧氧化
温室气体
甲烷
氧化亚氮
反硝化
anaerobic methane oxidation
greenhouse gas
methane
nitrous oxide
denitrification
