DOI: 10.1016/j.watres.2018.10.052
Scopus记录号: 2-s2.0-85055314577
论文题名: Impacts of chlorothalonil on denitrification and N 2 O emission in riparian sediments: Microbial metabolism mechanism
作者: Su X. ; Chen Y. ; Wang Y. ; Yang X. ; He Q.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 148 起始页码: 188
结束页码: 197
语种: 英语
英文关键词: Denitrification
; Metabolic activity
; Nitrous oxide
; Pesticide
; Riparian zone
Scopus关键词: Aquatic ecosystems
; Electron transport properties
; Enzyme activity
; Eutrophication
; Metabolism
; Nitrates
; Nitrogen oxides
; Pesticides
; Physiology
; Sediments
; Water pollution
; Electron transport systems
; Eutrophication control
; Glyceraldehyde-3-phosphate dehydrogenase
; Metabolic activity
; Nitrate accumulation
; Nitrous oxide
; Riparian zones
; Structure equation models
; Denitrification
; chlorothalonil
; glyceraldehyde 3 phosphate dehydrogenase
; nitrate
; nitrous oxide
; reduced nicotinamide adenine dinucleotide
; denitrification
; emission
; experimental study
; human activity
; metabolism
; microbial activity
; nitrous oxide
; organic compound
; pesticide
; riparian zone
; sediment pollution
; water pollution
; aquatic environment
; Article
; controlled study
; denitrification
; denitrifyer
; electron transport
; enzyme activity
; eutrophication
; microbial metabolism
; nonhuman
; riparian ecosystem
; sediment
英文摘要: Riparian zones can receive large amounts of nitrate, potentially contributing to water pollution. Denitrification is a major pathway to remove nitrate. Previous research on riparian denitrification focused on natural factors, but frequently neglected the roles of human activity, such as pesticide accumulations. Here, we combined field investigations and exposure experiments to reveal the responses of denitrification and N 2 O emission to chlorothalonil (CTN, a common pesticide) in column experiments with riparian sediments. In this study, CTN inhibited denitrification and led to nitrate accumulation in sediments. Furthermore, CTN significantly increased N 2 O emission by 208–377%, and this response was regulated by N 2 O reductase (NOS) activity rather than nosZ abundance. A mechanistic study indicated that the critical step (glyceraldehyde-3-phosphate to 3-phosphogylcerate) catalyzed by glyceraldehyde-3-phosphate dehydrogenase during microbial metabolism greatly influenced denitrification in CTN-polluted sediments. Our data also revealed that CTN declined electron donor NADH, electron transport system, and denitrifying enzyme activities during denitrification. Such responses suggested that CTN deteriorated sediment denitrification by inhibiting electron production, transport and consumption in denitrifiers. Additionally, structure equation modeling indicated that NOS was the key factor in predicting denitrification rate in CTN-polluted sediments. Overall, this is the first study to explore the effects of pesticide on denitrification and N 2 O emission in riparian zones at microbial metabolism level. Our results suggest that the safety threshold of CTN accumulation for inhibiting sediment denitrification is approximately 2 mg kg −1 , and imply that the wide presence of pesticides in riparian zones could impact eutrophication control of aquatic ecosystems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122215
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China; College of Urban Construction & Environmental Engineering, Chongqing University, Chongqing, 400045, China; 174 Shazhengjie Street, Shapingba District, China
Recommended Citation:
Su X.,Chen Y.,Wang Y.,et al. Impacts of chlorothalonil on denitrification and N 2 O emission in riparian sediments: Microbial metabolism mechanism[J]. Water Research,2019-01-01,148