Heterotrophic micpobes that can reduce Fe3+ in clay into Fe2+ can be obtained by the method of pure cultivation in artificial mineral mixture under constant temperature and anaerobic conditions.

• 利用人工配矿的方法在恒温、厌氧条件下进行纯培养，可得到使粘土矿物中Fe3+还原为Fe2+的异养微生物；