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为了研究稻秆还田条件下运行微生物燃料电池(microbial fuel cells,MFCs)是否能有效减排稻田甲烷,本研究将添加质量分数0.5%稻秆的土壤装入MFCs反应器,淹水并种植水稻后运行MFCs.待水稻经历苗期、分蘗期、晒田期、灌浆期和成熟期共98 d后,停止MFCs运行.在MFCs运行过程中实时连续记录电压,每周一次采用静态箱法搜集并检测反应器的甲烷排放通量.结果表明,MFCs电流在分蘗期逐步升高并达到峰值,并且运行MFCs显著降低添加稻秆土壤在苗期和分蘗期的甲烷累积排放通量.原因可能与产电菌和产甲烷菌竞争有机底物有关.MFCs运行98 d后,水稻株高、地上和地下部分生物量,以及产量未受显著影响.本研究为稻田CH_4减排提供了一种潜在的绿色可持续的技术.
In order to study whether the operation of microbial fuel cells (MFCs) under rice straw condition can effectively reduce the methane emission from paddy fields, the study was conducted in which MFCs containing 0.5% rice straw were added into the MFCs to flood and plant rice After running MFCs until the rice experienced seedling, tillering, sunning, filling and maturity 98d, stop MFCs running in the process of running MFCs real-time continuous voltage recording, once a week using static box method to collect and The results showed that the current of MFCs increased gradually and peaked at tillering stage and MFCs significantly reduced the cumulative methane fluxes at the seedling and tillering stages of rice straw addition, Bacteria and methanogens were involved in the competition of organic substrates.The plant height, above-ground and below-ground biomass, and yield were not significantly affected after 98 days of MFCs run.The study provided a potential green Sustainable technology.