自然生态系统中铁-氮耦合研究进展

Review on Coupling of Iron-Nitrogen Cycle in Natural Ecosystem

铁的氧化还原过程是自然生态系统中驱动氮循环的重要途径,已经成为研究氮生物地球化学循环的热点领域。通过梳理已有文献研究,系统总结了自然生态系统中铁-氮耦合的关键过程,包括铁氨氧化、硝酸盐厌氧铁氧化、Fe(Ⅱ)氧化耦合DNRA。并对其微生物驱动的反应过程、机理研究进展进行了小结,提出了铁氮耦合的研究不能忽视铁的氧化还原闭合过程,为深入认识铁调控的氮生物地球化学过程提供研究思路。目前,参与铁-氮耦合过程的功能微生物、耦合机制以及铁-氮耦合作用对氮素转化的贡献仍然是未知的。

Iron redox process is an important way to drive nitrogen cycling in natural ecosystems and has become a hotspot in the nitrogen biogeochemical cycling. This study systematically summarizes the key process of iron-nitrogen cycle in the natural ecosystem, including Feammox and nitrate anaerobic iron oxidation and Fe(Ⅱ) oxidation coupled DNRA. The progress of the reaction and mechanism of iron-nitrogen are summarized, and it is proposed that iron-nitrogen coupling process can not ignore the redox closure process of iron, which provides a new perspective for understanding the iron-regulated nitrogen biogeochemical process. Currently, the functional microorganisms and mechanisms of the iron-nitrogen coupling process and its contribution to nitrogen transformation remain unknown.