Ding Bang-Jing, Li Zheng-Kui, Zhu Hong-Jie, Chen Shi, Qin Yun-Bin, Yang Jian-Hua, Hu You-You
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Huan Jing Ke Xue. 2018 Apr 8;39(4):1833-1839. doi: 10.13227/j.hjkx.201707074.
Anaerobic ammonium oxidation coupled to iron (Ⅲ) reduction (termed Feammox) is a recently discovered pathway of nitrogen cycling. However, little is known about the pathways of N transformation via the Feammox process in riparian zones. In this study, evidence of Feammox in the riparian zone soil layers (0-20 cm) was demonstrated using the isotope tracing technique and a high-throughput sequencing technology. The results showed that Feammox occurred in the riparian zones in four different soil layers (A:0-5 cm, B:5-10 cm, C:10-15 cm, D:15-20 cm) and the Feammox rates ranged from 0.25 mg·(kg·d) to 0.29 mg·(kg·d). In the B soil sample, the Feammox rate was significantly higher than in the other soil samples (<0.05). In addition, iron reducing bacteria played an essential role in the Feammox process, and and were detected in all the soil samples. In the B soil sample, the abundance of iron reducing bacteria was significantly higher than in the other soil samples (<0.05). Overall, the co-occurrence of ammonium oxidation and iron reduction suggest that Feammox can play an essential role in the pathway of nitrogen removal in riparian zones.
厌氧氨氧化耦合铁（Ⅲ）还原（称为铁氨氧化）是最近发现的氮循环途径。然而，关于河岸带通过铁氨氧化过程进行氮转化的途径知之甚少。在本研究中，利用同位素示踪技术和高通量测序技术证明了河岸带土壤层（0-20厘米）中存在铁氨氧化。结果表明，铁氨氧化发生在河岸带的四个不同土壤层（A：0-5厘米，B：5-10厘米，C：10-15厘米，D：15-20厘米），铁氨氧化速率范围为0.25毫克·（千克·天）至0.29毫克·（千克·天）。在B土壤样品中，铁氨氧化速率显著高于其他土壤样品（<0.05）。此外，铁还原细菌在铁氨氧化过程中起着至关重要的作用，并且在所有土壤样品中都检测到了 和 。在B土壤样品中，铁还原细菌的丰度显著高于其他土壤样品（<0.05）。总体而言，氨氧化和铁还原的同时存在表明铁氨氧化在河岸带氮去除途径中可以发挥重要作用。
