Characteristics of N_2O release from polluted creeks in the Taihu Lake Basin: sources and microbial populations

Da Li; Linglong Shi; Shuangzhen GuoLihua Zang

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Characteristics of N_2O release from polluted creeks in the Taihu Lake Basin: sources and microbial populations

机译：Characteristics of N_2O release from polluted creeks in the Taihu Lake Basin: sources and microbial populations

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Polluted rural creek systems are a potential primary source of nitrous oxide (N_2O). However, to date, the N_2O emission pathways of rural creek systems have yet to be investigated. In particular, the correlations between N_2O emissions and ammonia-oxidizing archaea (AOA), ammoniating bacteria (AOB), and denitrifying communities remain poorly understood. In this paper, a sediment-water-environment simulation system was established to analyze the N_2O emission pathways, and the correlations between N_2O emissions and nitrogen-related functional genes for two creeks that have been polluted by domestic sewage and industrial wastewater have been studied. The results indicated that the N_2O release rate of the creek polluted by domestic sewage was higher than that of the creek polluted by industrial wastewater, and the heterotrophic deni-trification and nitrification were the main N_2O emission pathways for the creek polluted by domestic sewage. On the contrary, nitrification and chemical denitrification were the primary N_2O emission pathways for the creek polluted by industrial wastewater. The quantitative PCR (qPCR) results obtained for nitrogen-cycle functional genes in creek sediments indicated that the abundances of AOA genes (AOA amoA), AOB genes (AOB amoA), and denitrification genes (nosZ) were lower in the creek polluted by industrial wastewater than that in the creek polluted by domestic sewage. For the creek polluted by domestic sewage, the N_2O emission rate exhibited a significant positive correlation with the abundances of AOA amoA and AOB amoA and a correlation with the abundances of the dominant nitrogen-cycling microorganisms (p＜0.05). However, no such correlations were found for the creek polluted by industrial wastewater. In the future, the patterns detected here will be useful as markers to distinguish whether water has been polluted by industry.

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《Aquatic sciences》 |2022年第3期|37.1-37.11|共11页
作者
Da Li; Linglong Shi; Shuangzhen GuoLihua Zang;
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作者单位

School of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China,State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Science, Beiji;

School of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
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N_2O emission; N_2O emission pathways; Functional genes; Microbial community;

Characteristics of N_2O release from polluted creeks in the Taihu Lake Basin: sources and microbial populations

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