Community structure and methane oxidation characteristics of methanotrophs in iron-rich environment
In recent years,the potential methane emission from wetlands has attracted much attention.The iron-rich wetland in Caohai of Munigou has a very important ecological status.However,there are relatively few studies on the community structure and oxidation properties of methanotrophs in this area.The next generation sequencing technology was used to study the community structure and function of methanotrophs in the iron-rich wetland of Caohai,and a type of dominant methanotrophs was screened out to conduct experiment tests in the iron-rich solution.Sequencing results showed that the dominant methanotrophs were Type Ⅰ Methylobacter and Methylomonas,and RDA analysis indicated that pH and ORP were the key environmental drivers affecting the methanotrophs community.The experimental results showed that during the reaction,the strain could secrete products like humus to transfer intracellular electrons to extracellular ones.Therefore,Fe(Ⅲ)in the solution could act as an electron acceptor.The oxidation efficiency of methane in the iron-rich solution increased by about 10.8％,and the strain could completely oxidize the methane gas in the flask within 7 days.These results are expected to provide a theoretical reference for methane emission reduction in wetlands.
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