研究报告
罗文齐,徐梦珊,李丹丹,丁帮璟,李正魁.蓝藻暴发对太湖梅梁湾底泥中铁氨氧化速率的影响[J].环境科学学报,2020,40(8):2828-2833
蓝藻暴发对太湖梅梁湾底泥中铁氨氧化速率的影响
- Effect of cyanobacteria outbreak on Feammox rates in the sediments of Meiliang Bay,Taihu Lake
- 基金项目：国家水体污染控制与治理科技重大专项（No.2017ZX07204-004）
- 作者
- 单位
- 罗文齐
- 1. 南京大学环境学院, 南京 210046;2. 污染控制与资源化研究国家重点实验室, 南京 210023
- 徐梦珊
- 1. 南京大学环境学院, 南京 210046;2. 污染控制与资源化研究国家重点实验室, 南京 210023
- 李丹丹
- 1. 南京大学环境学院, 南京 210046;2. 污染控制与资源化研究国家重点实验室, 南京 210023
- 丁帮璟
- 1. 南京大学环境学院, 南京 210046;2. 污染控制与资源化研究国家重点实验室, 南京 210023
- 李正魁
- 1. 南京大学环境学院, 南京 210046;2. 污染控制与资源化研究国家重点实验室, 南京 210023
- 摘要：作为近年来新发现的氮循环过程，铁氧化物还原耦合氨氧化（Feammox）越来越受到人们的关注.然而，目前鲜有研究报道蓝藻暴发对湖泊底泥中铁氨氧化速率的影响.因此，本研究采集了湖泊聚藻区和无藻区的底泥，对其理化性质进行分析，同时利用稳定同位素示踪技术测定了铁氨氧化速率，并运用高通量测序技术探究了底泥的微生物群落组成.结果表明，无藻区底泥的铁氨氧化速率为0.29 mg·kg-1·d-1，显著高于聚藻区底泥（0.01~0.05 mg·kg-1·d-1），而且铁氨氧化速率与pH、Fe（Ⅲ）和TOC（总有机碳）均具有显著的相关性（p<0.05）.此外，高通量测序结果表明，在不同底泥中6种主要的铁还原菌（Thiobacillus、Geobacter、Desulfobacca、Pseudomonas、Anaeromyxobacter和Desulfosporosinus）被检测到，并且铁还原菌的丰度在无藻区底泥中为5.65%，比在聚藻区底泥（3.25%~4.44%）中的高.总之，本研究结果说明蓝藻暴发会减弱湖泊底泥中的铁氨氧化反应.
- Abstract：Recently, anaerobic ammonium oxidation coupled with ferric iron reduction (termed Feammox), as a newly discovered anaerobic nitrogen (N) loss pathway, is attracting more and more attention. However, few studies have reported the effect of cyanobacteria outbreak on Feammox rate in the lake sediments. In this study, the sediments in the algae-rich and algae-free areas of the lake were collected, and their physicochemical characteristics were analyzed. Based on a 15N-labelled isotope tracing technique and the analysis of microbial communities, the results showed that the Feammox rate of the sediment in the algae-free area was 0.29 mg·kg-1·d-1, which was significantly higher than that in the algae-rich area (0.01~0.05 mg·kg-1·d-1). The Feammox rate had a significant correlation with pH, Fe(Ⅲ) and TOC (total organic carbon) content (p<0.05). Additionally, the results of the high-throughput sequencing showed that five predominant iron-reducing genera (Thiobacillus, Geobacter, Desulfobacca, Pseudomonas, Anaeromyxobacter and Desulfosporosinus) were detected in different sediments, and the relative abundance of Fe reduction bacteria was 5.65% in the algae-free area, higher than that in the algae-rich area (3.25%~4.44%). In summary, the results of this study indicate that cyanobacteria outbreaks can inhibit the Feammox reaction in the lake sediments.
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