Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake

Shiya ZHU; Runzhu WANG; Jing CHEN; Xiaobing WANG; Xiaofeng CHEN

doi:10.1007/s00343-026-5247-9

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Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake

Updated：2026-10-13

- Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake
- Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake
- 海洋湖沼学报(英文) 2026年页码：1-11
- Affiliations：
  
  School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
- Author bio：
  
  xfchen@yzu.edu.cn
- Funds：
  
  the National Natural Science Foundation of China(42177185;41373076)
- DOI：10.1007/s00343-026-5247-9
  中图分类号：
- 收稿：2025-07-04，
  
  网络首发：2026-10-13，
- Accepted：
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Shiya ZHU, Runzhu WANG, Jing CHEN, 等. Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake[J/OL]. 海洋湖沼学报(英文), 2026,1-11.

ZHU Shiya,WANG Runzhu,CHEN Jing,et al.Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake[J].Journal of Oceanology and Limnology,
Shiya ZHU, Runzhu WANG, Jing CHEN, 等. Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake[J/OL]. 海洋湖沼学报(英文), 2026,1-11. DOI： 10.1007/s00343-026-5247-9.

ZHU Shiya,WANG Runzhu,CHEN Jing,et al.Impacts of cyanobacterial blooms outbreak and decline on Feammox in the sediments of Taihu Lake[J].Journal of Oceanology and Limnology, DOI：.

摘要

Abstract

Microbial mediated anaerobic ammonium oxidation coupled to ferric iron reduction (Feammox) represents a potentially crucial nitrogen removal pathway in eutrophic lakes. However

its response to cyanobacterial blooms in sediment environments remains unclear. In this study

the microcosms containing fresh cyanobacteria particles were cultured under natural conditions

and techniques of X-ray absorption fine structure spectrum (XAFS)

high-throughput sequencing

and

N isotope tracing were utilized to examine the impacts of outbreak and decline of cyanobacterial bloom on the iron forms

iron-reducing ba

cteria (FeRB) and Feammox potential rates in the surface sediment. The XAFS results revealed that cyanobacterial blooms promoted the formation of FeOOH

which theoretically favors Feammox. Surprisingly

the potential rate of Feammox was significantly suppressed during the active bloom phase compared to the control (

0.05)

likely due to the inhibition of FeRB growth under bloom-induced high dissolved oxygen and alkaline conditions

as evidenced by a lower relative abundance of FeRB. In contrast

after an 80-d cultivation under natural conditions

the degradation of cyanobacteria led to substantial accumulation of hydrochloric acid-extractable Fe(III)

humic acid

along with a recovery in the relative abundance of FeRB

resulting in a significantly increase in the potential Feammox rate. These findings demonstrate that cyanobacterial blooms modulate sediment Feammox activity in opposite directions during distinct phases of outbreak and decline

by altering key substrates and microenvironments. This study highlights the complex role of cyanobacterial blooms in nitrogen cycling and advances our understanding of ecological nitrogen removal in eutrophic lakes.

关键词

Keywords

references

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