NosZI microbial community determined the potential of denitrification and nitrous oxide emission in river sediments of Qinghai-Tibetan Plateau

Guo, Zhen; Su, Rui; Zeng, Jin; Wang, Shuren; Zhang, Danrong; Yu, Zhigang; Wu, Qinglong L.; Zhao, Dayong

doi:10.1016/j.envres.2022.114138

Cited by 14 publications

(3 citation statements)

References 70 publications

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“…Physical transport as well as microbial transformation processes are commonly believed to regulate nitrogen concentration in rivers. − However, the effect of abiotic nitrogen transformation requires further investigation. Therefore, the potential denitrification, dissimilatory nitrate reduction to ammonium, and ANAMMOX rates of sediments should be evaluated using the 15 N-labeled isotope experiment to determine the microbial nitrogen removal capacities. , To distinguish between abiotic and biotic nitrogen transformation pathways, isotopic tracing data might be compared with nitrogen simulation and measurement differences.…”

Section: Resultsmentioning

confidence: 99%

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Zhu

Bu³

et al. 2023

Environ. Sci. Technol.

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The characterization of variations in riverine microbiota that stem from contaminant sources and transport modes is important for understanding biogeochemical processes. However, the association between complex anthropogenic nitrogen pollution and bacteria has not been extensively investigated owing to the difficulties faced while determining the distribution of nitrogen contaminants in watersheds. Here, we employed the Soil and Water Assessment Tool alongside microbiological analysis to explore microbial characteristics and their responses to complex nitrogen pollution patterns. Significant variations in microbial communities were observed in sub-basins with distinct land–water pollution transport modes. Point source-dominated areas (PSDAs) exhibited reduced microbial diversity, high number of denitrification groups, and increased nitrogen cycling compared with others. The negative relative deviations (−3.38) between the measured and simulated nitrate concentrations in PSDAs indicated that nitrate removal was more effective in PSDAs. Pollution sources were also closely associated with microbiota. Effluents from concentrated animal feeding operations were the primary factors relating to the microbiota compositions in PSDAs and balanced areas. In nonpoint source-dominated areas, contaminants from septic tanks become the most relevant sources to microbial community structures. Overall, this study expands our knowledge regarding microbial biogeochemistry in catchments and beyond by linking specific nitrogen pollution scenarios to microorganisms.

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Section: Resultsmentioning

confidence: 99%

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Zhu

Bu³

et al. 2023

Environ. Sci. Technol.

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“…5−7 Accordingly, recent investigations have identified water columns as an additional focal point for N 2 O generation and release, especially for high-order rivers, in addition to the benthic water−sediment interface. 8,9 Subsequent research has revealed that ignoring N 2 O production within the water column results in an underestimation of nearly 50% of N 2 O emissions in six Chinese river networks. 10 Thus, increasing studies have paid attention to N 2 O production and emission in riverine water columns.…”

Section: Introductionmentioning

confidence: 99%

“…River systems are important sites for N 2 O emissions, converting at least 680 Gg of anthropogenic N inputs to N 2 O-N per year, equivalent to 10% of the global anthropogenic N 2 O emissions . N 2 O production in streams and rivers occurs mainly through the microbial processes of nitrification and denitrification. , Previous studies have found that oxic–suboxic (and even anoxic) interfaces on suspended particles in oxic water columns support nitrification and denitrification [and even anaerobic ammonium oxidation (anammox)]. − Accordingly, recent investigations have identified water columns as an additional focal point for N 2 O generation and release, especially for high-order rivers, in addition to the benthic water–sediment interface. , Subsequent research has revealed that ignoring N 2 O production within the water column results in an underestimation of nearly 50% of N 2 O emissions in six Chinese river networks . Thus, increasing studies have paid attention to N 2 O production and emission in riverine water columns.…”

Section: Introductionmentioning

confidence: 99%

Nitrous Oxide (N₂O) Emissions Decrease Significantly under Stronger Light Irradiance in Riverine Water Columns with Suspended Particles

Jiang,

Zhang,

Wang

et al. 2023

Environ. Sci. Technol.

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Nitrous oxide (N2O) emissions from riverine water columns with suspended particles are important for the global N2O budget. Although sunlight is known to influence the activity of nitrogen-cycling microorganisms, its specific influence on N2O emissions in river systems remains unknown. This study analyzed the influences of light irradiance on N2O emissions in simulated oxic water columns with 15N-labeling and biological molecular techniques. Our results showed that N2O emissions were inhibited by light in the ammonium system (only 15NH4 + was added) and significantly decreased with increasing light irradiance in the nitrate system (only 15NO3 – was added), despite contrasting variations in N2 emissions between these two systems. Lower N2O emission rates in the nitrate system under higher light conditions resulted from higher promotion levels of N2O reduction than N2O production. Increased N2O reduction was correlated to higher organic carbon bioavailability caused by photodegradation and greater potential for complete denitrification. Lower N2O production and higher N2O reduction were responsible for the lower N2O emissions observed in the ammonium system under light conditions. Our findings highlight the importance of sunlight in regulating N2O dynamics in riverine water columns, which should be considered in developing large-scale models for N2O processing and emissions in rivers.

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Contrasting effects of climate change on denitrification and nitrogen load reduction in the Po River (Northern Italy)

Gervasio,

Soana,

Gavioli

et al. 2024

Environ Sci Pollut Res

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An increase in water temperature is one of the main factors that can potentially modify biogeochemical dynamics in lowland rivers, such as the removal and recycling of nitrogen (N). This effect of climate change on N processing deserves attention, as it may have unexpected impacts on eutrophication in the coastal zones. Intact sediment cores were collected seasonally at the closing section of the Po River, the largest Italian river and one of the main N inputs to the Mediterranean Sea. Benthic oxygen fluxes, denitrification, and dissimilatory nitrate reduction to ammonium (DNRA) rates were measured using laboratory dark incubations. Different temperature treatments were set up for each season based on historical data and future predictions. Higher water temperatures enhanced sediment oxygen demand and the extent of hypoxic conditions in the benthic compartment, favoring anaerobic metabolism. Indeed, warming water temperature stimulated nitrate (NO3−) reduction processes, although NO3− and organic matter availability were found to be the main controlling factors shaping the rates between seasons. Denitrification was the main process responsible for NO3− removal, mainly supported by NO3− diffusion from the water column into the sediments, and much more important than N recycling via DNRA. The predicted increase in the water temperature of the Po River due to climate change may exert an unexpected negative feedback on eutrophication by strongly controlling denitrification and contributing to partial buffering of N export in the lagoons and coastal areas, especially in spring. Graphical Abstract

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NosZI microbial community determined the potential of denitrification and nitrous oxide emission in river sediments of Qinghai-Tibetan Plateau

Cited by 14 publications

References 70 publications

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Nitrous Oxide (N₂O) Emissions Decrease Significantly under Stronger Light Irradiance in Riverine Water Columns with Suspended Particles

Contrasting effects of climate change on denitrification and nitrogen load reduction in the Po River (Northern Italy)

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NosZI microbial community determined the potential of denitrification and nitrous oxide emission in river sediments of Qinghai-Tibetan Plateau

Cited by 14 publications

References 70 publications

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Land–Water Transport and Sources of Nitrogen Pollution Affecting the Structure and Function of Riverine Microbial Communities

Nitrous Oxide (N2O) Emissions Decrease Significantly under Stronger Light Irradiance in Riverine Water Columns with Suspended Particles

Contrasting effects of climate change on denitrification and nitrogen load reduction in the Po River (Northern Italy)

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Nitrous Oxide (N₂O) Emissions Decrease Significantly under Stronger Light Irradiance in Riverine Water Columns with Suspended Particles