Salinity causes differences in stratigraphic methane sources and sinks  

作　　者：Ying Qu Yuxiang Zhao Xiangwu Yao Jiaqi Wang Zishu Liu Yi Hong Ping Zheng Lizhong Wang Baolan Hu 

机构地区：[1]Department of Environmental Engineering,Zhejiang University,Hangzhou,China [2]Ocean College,Zhejiang University,Zhoushan,China [3]Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety,Hangzhou,China

出　　处：《Environmental Science and Ecotechnology》2024年第3期141-151,共11页环境科学与生态技术（英文）

基　　金：supported by the Key R&D Program of Zhejiang(No.2022C03010).

摘　　要：Methane metabolism,driven by methanogenic and methanotrophic microorganisms,plays a pivotal role in the carbon cycle.As seawater intrusion and soil salinization rise due to global environmental shifts,understanding how salinity affects methane emissions,especially in deep strata,becomes imperative.Yet,insights into stratigraphic methane release under varying salinity conditions remain sparse.Here we investigate the effects of salinity on methane metabolism across terrestrial and coastal strata(15-40 m depth)through in situ and microcosm simulation studies.Coastal strata,exhibiting a salinity level five times greater than terrestrial strata,manifested a 12.05%decrease in total methane production,but a staggering 687.34%surge in methane oxidation,culminating in 146.31%diminished methane emissions.Salinity emerged as a significant factor shaping the methane-metabolizing microbial community's dynamics,impacting the methanogenic archaeal,methanotrophic archaeal,and methanotrophic bacterial communities by 16.53%,27.25%,and 22.94%,respectively.Furthermore,microbial interactions influenced strata system methane metabolism.Metabolic pathway analyses suggested Atribacteria JS1's potential role in organic matter decomposition,facilitating methane production via Methanofastidiosales.This study thus offers a comprehensive lens to comprehend stratigraphic methane emission dynamics and the overarching factors modulating them.

关 键 词：Shallow gas strata SALINITY Methane emission Microbial community Microbial interactions 

分 类 号：X51[环境科学与工程—环境工程]