胶州湾沉积物中一氧化碳的微生物产生及消耗研究OA北大核心CSTPCD

Carbon monoxide(CO)is one of the dominant inorganic compounds that can serve as important carbon and energy sources for microbes in marine environments.Despite the significance of CO in marine sedi-ments,the biogeochemical cycling processes remain largely unconstrained due to the limited measurements.Here we reported the first report of CO quantification in the sediments of Jiaozhou Bay and combined with labo-ratory incubation to investigate the process of CO production and consumption.CO concentrations in sediment porewater ranged from 46.8 to 189.9 nmol·L-1.The incubation experiments showed significant enhancement of microbial CO production by the addition of trimethylamine and glycine betaine.The addition of inhibitors of methanogenesis and sulfate-reducing process,Sodium 2-Bromoethanesulfonate(BES)and sodium molybdate,presented no obvious impact on CO consumption,indicating that both methanogenesis and sulfate-reduction were not the main microbial process of CO consumption.On the contrary,an obvious inhibition impact on CO consumption was found by the increased concentration of nitrate.Collectively,our study provides key informa-tion on the concentrations,production,and consumption of CO in the sediments porewater,contributing to a better understanding of CO biogeochemical cycling in the ocean.