Shifts in the relative abundance and potential rates of sediment ammonia-oxidizing archaea and bacteria along environmental gradients of an urban river–estuary–adjacent sea continuum

Wei, He; Lin, Xianbiao

doi:10.1016/j.scitotenv.2020.144824

Cited by 12 publications

(3 citation statements)

References 83 publications

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“…However, such comparisons are necessary to understand how DAMO microorganisms and processes vary along the continuum as a whole to make comprehensive management decisions. In fact, some studies have shown that factors including oxygen levels, nutrient conditions, organic matter contents, pH, Fe, and sulfate, as well as N cycling processes, can change dramatically along the river-estuary-sea continuum (Lin et al, 2016;Lin et al, 2017b;Lin et al 2017a;Wei et al, 2020;Wei and Lin, 2021), most of which are also sensitive factors for DAMO as we reviewed.…”

Section: Limitation and Outlookmentioning

confidence: 99%

The denitrifying anaerobic methane oxidation process and microorganisms in the environments: A review

Wei

Wang

et al. 2022

Front. Mar. Sci.

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Methane (CH4) is an important greenhouse gas with a global warming potential 28 – 34 times that of CO2 over the 100-year horizon. Denitrifying anaerobic methane oxidation (DAMO) is a recently discovered process that potentially represents an important CH4 sink globally. This process involves two possible pathways: the nitrite-dependent DAMO mediated by NC10 bacteria and the nitrate-dependent DAMO by ANME-2d archaea. Both are widely detected in freshwater and coastal habitats using molecular tools. However, the distributions of these two processes and the functional microorganisms and their interactions with other N cycling pathways are far from clear. In this review, we conducted a scientometric analysis on a co-citation network consisting of 835 references derived from 354 citing articles closely related to the distribution of DAMO in the environment. Through this analysis, we found that current studies focus more on freshwater systems than coastal systems, and ANME-2d archaea are generally under-studied compared to NC10 bacteria. The emerging research topics in this area include AMO processes coupled to alternative electron acceptors and their role as CH4 sinks. We further reviewed papers focusing on DAMO distribution in freshwater and coastal environments guided by the result of the scientometric analysis. Finally, we identified several areas that require further research and proposed future research including comparisons of DAMO with other N cycling pathways and environmental conditions in the context of the river-estuary-sea continuum.

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Section: Limitation and Outlookmentioning

confidence: 99%

The denitrifying anaerobic methane oxidation process and microorganisms in the environments: A review

Wei

Wang

et al. 2022

Front. Mar. Sci.

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“…The coastal wetland is a critical link between the land and the sea, which plays an important role in the removal of nutrients [10]. In general, the excess reactive N in estuarine and coastal ecosystems mostly comes in the form of NO 3 − and NH 4 + [11][12][13][14]. Thus, our research mainly focuses on sediment NO x − reduction processes, which play a dominant role in estuarine and coastal ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Lin

Huang

2022

JMSE

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Sediment denitrification, anaerobic ammonium oxidation (anammox), and nitrate dissimilation to ammonium (DNRA) play an important role in controlling the dynamics of nitrates (NOx−) and their fate in estuarine and coastal ecosystems. However, the effects of land-use change on NOx− reduction processes in mangrove sediments are still unclear. Here, we used a mud experiment method combined with a 15N stable isotope tracer method to study the mechanism and ecological environment of the change of land use pattern on the sediment NOx− reduction processes in mangrove wetlands. Our study showed that most physicochemical parameters, NOx− reduction rates, and their gene abundances varied considerably. The denitrification, anammox, and DNRA rates in mangrove sediment cores were in a range of 1.04–4.24 nmol g−1 h−1, 0.14–0.36 nmol g−1 h−1, and 0–2.72 nmol g−1 h−1, respectively. The denitrification, anammox, and DNRA rates in aquaculture sediment cores were in a range of 1.06–10.96 nmol g−1 h−1, 0.13–0.37 nmol g−1 h−1, and 0–1.96 nmol g−1 h−1, respectively. The highest values of denitrification, anammox, DNRA, the contribution of denitrification and DNRA to total NOx− reduction (DEN% and DNRA%), gene abundances (nirS, Amx 16S rRNA, and nrfA), total organic carbon (TOC), total nitrogen (TN), and TOC/TN in sediments were generally found in the top layer (0–5 cm) and then decreased with depth, while the contribution of anammox to total NOx− reduction (ANA%), Fe2+, and Fe2+/Fe3+ were generally increased with sediment depth in both mangrove and aquaculture ecosystems. When mangrove wetlands are transformed into pools, some properties (including TOC, TN, and Fe3+), DNRA rates, DRNA%, and nrfA gene abundances were decreased, while some properties (including NH4+, TOC/TN, Fe2+, and Fe2+/Fe3+), denitrification rates, DEN%, nirS, and ANAMMOX 16S gene abundances were increased. Sediment organic matter (TOC and TN) content and Fe2+ both affected NO3− reduction rates, with organic matter the most prominent factor. Thus, aquaculture reclamation enhances N loss while reducing N retention in sediments of mangrove wetlands, which plays an important role in regulating the source and fate of reactive N in mangrove ecosystems.

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“…Among these processes, denitrification (reduction of NO 3 − to N 2 O/N 2 ), methanogenesis, and sulfate reduction are the major redox processes in the coastal aquifer due to the lack of O 2 (Huang et al, 2022b). However, the redox processes in the coastal aquifer have relatively spatial and temporal heterogeneity that are mainly influenced by terrestrial pollutants and saltwater intrusion (Wei and Lin, 2021). How to reveal the redox processes in groundwater and clarify the controlling factors are a huge challenge.…”

Section: Introductionmentioning

confidence: 99%

Hydrochemical Evolution and Nitrogen Behaviors in Coastal Groundwater Suffered From Seawater Intrusion and Anthropogenic Inputs

Dun

Ling²,

Wang³

et al. 2022

Front. Mar. Sci.

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Coastal aquifers play key roles in providing freshwater resources to maintain the social and economic development in coastal areas. However, climate change and human activities have dramatically affected the quantities and qualities of groundwater in coastal aquifers. In this study, stoichiometric analysis of hydrogeochemistry, multivariate analysis, and isotopic trancing techniques were used to reveal the local hydrochemistry characteristics, the natural and anthropogenic origins, and the major hydrochemical evolution in a typical coastal aquifer located in the Pearl River estuary. According to hydrogeological conditions and groundwater burial conditions, the aquifer was divided into three zones, namely, semiconfined fissure groundwater (SFGW), recharged fissure groundwater (RFGW), and porous medium groundwater (PGW). Seawater intrusion, ion exchange, water–rock reaction, and human activities were the main controlling factors affecting the characteristics of groundwater, but there were significant differences in the main controlling effects of different zones. Among them, the samples from the SFGW was severely affected by seawater intrusion, and the contributions of seawater ranged from 6% to 97%. Obvious cation exchange process occurred during the seawater intrusion. The hydrochemical characteristics of the PGW and the RFGW were mainly controlled by water–rock interaction. In addition, human activities had further influence on the hydrochemical characteristics of groundwater, which resulted in elevated nitrate–nitrogen (NO3−–N). The mean NO3–N concentrations in the PGW and the SFGW were 6.58 and 3.07 mg/L, respectively. Furthermore, the δ15N–NO3− and δ18O–NO3− values in these two regions ranged from +2.35‰ to +27.54‰ and from +0.39‰ to +18.95‰, respectively, indicating that the anthropogenic input contributed to the increased nitrate. Redox analysis and dual nitrogen isotopic evidence indicated that denitrification was the predominant biogeochemical process in the PGW and the RFGW. This study highlights the impacts of seawater intrusion and anthropogenic inputs on hydrochemical evolution and nitrogen behaviors in coastal groundwater, which provides a scientific basis for the management of groundwater resources in coastal aquifers.

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Shifts in the relative abundance and potential rates of sediment ammonia-oxidizing archaea and bacteria along environmental gradients of an urban river–estuary–adjacent sea continuum

Cited by 12 publications

References 83 publications

The denitrifying anaerobic methane oxidation process and microorganisms in the environments: A review

The denitrifying anaerobic methane oxidation process and microorganisms in the environments: A review

Effect of Aquaculture Reclamation on Sediment Nitrates Reduction Processes in Mangrove Wetland

Hydrochemical Evolution and Nitrogen Behaviors in Coastal Groundwater Suffered From Seawater Intrusion and Anthropogenic Inputs

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