太湖沉积物硝酸盐依赖亚铁氧化性能研究

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Abstract The sediments collected from different areas of Lake Taihu were anaerobically cultured, in combination with high-throughput sequencing and isotope enrichment technologies, to explore whether nitrate dependent ferrous [Fe(II)] oxidation (NDFO) can occur in the sediments of Lake Taihu, and whether Fe(II) addition can promote nitrogen removal from Lake Taihu. After anaerobic incubation for 24h, the concentrations of NO₃⁻-N and Fe(II) in the overlying water decreased simultaneously, showing a significantly positive correlation (P<0.01). The relative abundance of NDFO related genera in cultured sediments increased from 0.69%±0.07% to 4.23%±0.90%. Combined with the change of sediment color, it can be inferred that NDFO occurred during anaerobic culture. The concentrations of NO₃⁻-N in the control and the treatment added with lowest levels of Fe(II) (2.8mg) were significantly higher than those in other treatments (P<0.05, ANOVA), while the concentration of nitrite (NO₂⁻) increased significantly with the increase of Fe(II) addition (P<0.01, ANOVA), indicating that a certain amount of Fe(II) can promote the reduction of NO₃⁻ and cause the accumulation of NO₂⁻. After the addition of a small amount of Fe(II) (about 1.9mg/g sediment), the potential denitrification rate of the sediment in the different areas of Lake Taihu reached 213~252mg N/(m²·d), indicating that Fe(II) may play an important role in the denitrification process in Lake Taihu.

Key words： cyanobacterial bloom nitrate dependent ferrous oxidation sediment Lake Taihu

Received: 06 February 2023

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X524

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	CHEN Xiao-feng
	WANG Run-zhu
	ZHU Shi-ya
	CHEN Jing

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CHEN Xiao-feng,WANG Run-zhu,ZHU Shi-ya等. Nitrate dependent ferrous oxidation in the sediments of Lake Taihu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4868-4875.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4868

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