Significant microbial nitrogen loss from denitrification and anammox in the land-sea interface of low permeable sediments

Jiao, Lijing; Wu, Jiapeng; He, Xiang; Wen, Xiaomei; Li, Yiben; Hong, Yiguo

doi:10.1016/j.ibiod.2018.10.002

Cited by 37 publications

(19 citation statements)

References 55 publications

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“…Although anammox was previously considered minor compared to denitrification, the recently revised isotope technique revealed that 64−86% of the total N loss in the seagrass sediment at Shaws Bay, Australia, was caused by anammox (Salk et al 2017). A higher contribution of anammox than denitrification to the total N loss was also reported in the sediment from oyster farming in the Wallis Lake estuary, Australia (Erler et al 2017), although the balance between anammox and denitrification is not consistent among studies (Dong et al 2011;Jiao et al 2018;Tan et al 2019). The proportion of anammox and denitrification is affected by various environmental factors, such as DO and salinity (Jiang et al 2017;Liu et al 2020).…”

Section: Urbanizationmentioning

confidence: 99%

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

2021

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Tropical primary forests have been disappearing quickly to make use of the land for commercial purposes. Land-use change has an impact on downstream aquatic processes, but those impacts have mainly been studied in temperate climate regions. The present article reviews the impacts of various tropical land-use changes caused by human activities on downstream riverine and estuarine water properties and biogeochemical cycles, focusing especially on the behaviors of nitrogen (N) and phosphorus (P). Logging of tropical primary forests, subsequent establishment of pasture lands, and occasional wildfire or intentional burning have decreased terrestrial N fixation and increased the discharge of P combined with soils, which has lowered the N:P ratio of dissolved inorganic nutrients in the adjacent stream waters and downstream rivers. Agricultural fertilizers and aquacultural practices basically cause nutrient enrichment in downstream riverine and estuarine waters, changing the N:P ratio depending on the source. Finally, urbanization causes eutrophication in many tropical estuaries, where a halocline forms easily because of a warm temperature throughout the year and the water at the bottom of the estuary tends to become hypoxic or anoxic. Overall, the impact of land-use change on aquatic processes may be more serious in tropical regions than in temperate or cold climate regions because of (1) a higher biomass and nutrient stock in original tropical forests; (2) higher precipitation, more frequent episodic flooding, and warmer temperatures in tropical regions; and (3) certain practices that are rapidly expanding in tropical regions such as land-based aquaculture. Various land-use changes are causing downstream nutrient enrichment or disturbance of the nutrient balance at tropical land-sea interfaces, and the overall N:P ratios in the aquatic ecosystem seem to be declining. Nonetheless, if proper management is conducted and the discharge of nutrients and soils ceases, tropical aquatic systems may have the potential to recover faster than those in other climate regions because of their abundant precipitation and warm temperature. Long-term monitoring and more attention to elemental stoichiometry are important areas for future research.

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Section: Urbanizationmentioning

confidence: 99%

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

2021

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“…The denitrifier community composition exhibited high diversity without a sample-specific clade. Moreover, this diverse and homogeneous distribution has also been observed in other estuarine sediments, which implies broad adaptability to the environmental conditions (Jiao et al 2018).…”

Section: Discussionmentioning

confidence: 60%

Removal Capacities and Environmental Constrains of Denitrification and Anammox Processes in Eutrophic Riverine Sediments

Song

2020

Water Air Soil Pollut

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Excessive nitrogen (N) loading has had severe consequences in coastal zones around the world. Denitrification and anammox are major microbial pathways for removing N in aquatic environments before it is exported to the coast. To assess two processes in eutrophic riverine systems, the denitrification and anammox and their bacterial participants were investigated in sediments of the Xiaoqing (XQ) River and Jiaolai (JL) River in Northeast China. By combining the evidence from N 15 isotope tracing experiment and functional gene-based analysis, it was found that denitrification and anammox are ubiquitous along the investigated riverine sediments. The denitrification varied from 39.38 to 1433.01 nmol N 2 m −2 h −1 . Moreover, the anammox rates were in the range of 15.91 to 1209.97 nmol N 2 m −2 h −1 . Quantitative PCR results revealed that the nirK and nirS genes were in the order of 10 4 -10 6 copies g −1 and 10 3 -10 5 copies g −1 , respectively, in both river sediments, while the hzsA was in the order of 10 6 -10 5 copies g −1 in XQ at approximately two orders of magnitude compared with JL. The phylogenetic analysis of functional genes revealed the high diversity of the denitrifier and low diversity of anammox bacteria. Variance partitioning analyses verified that the grain particle characteristics were the major factor group determined the N removal efficiency. The denitrification and anammox processes were estimated to have removed 16.1% of the inorganic nitrogen inputs before being exported to Laizhou Bay, which highlights that a more extensive understanding of the regularity of the N removal processes is important in the technical remediation of eutrophication problems.

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“…In short, the tags and primers were removed from quality‐controlled sequences. The simplified sequences were aligned to the newly developed database of anammox 16S rRNA genes with the align.seqs command (Jiao et al., 2018; Wu, Hong, Chang, et al., 2019). Then, the badly aligned sequences were filtered and removed by the seqs.command .…”

Section: Methodsmentioning

confidence: 99%

Wide distribution of anaerobic ammonium‐oxidizing bacteria in the water column of the South China Sea: Implications for their survival strategies

Liu

Hong

et al. 2020

Diversity and Distributions

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Aim Anammox bacteria are widely distributed in various environments, but the community composition and survival strategies of anammox bacteria in oligotrophic, deep‐sea water rich in dissolved oxygen (DO) remain unknown. We aimed to understand the distribution of anammox bacteria in the water columns of the South China Sea (SCS). Time period Three cruises were in October 2014, October 2015 and September 2016, respectively. Location Six water columns were obtained in the SCS, China (E 111–120°, N 16–22°). Methods The diversity and community composition of anammox bacteria were investigated through a high‐throughput sequencing technique targeting the anammox 16S rRNA gene. Results Unexpectedly, phylogenetic analysis showed that Ca. Brocadia (78.35%) was the dominant genus while Ca. Scalindua and unclassified species accounted for 12.62% and 9.03%, respectively. The highest diversity of anammox bacteria and concentrations of particulate organic matter (POM) were simultaneously observed in the 50–200 m layer, suggesting that particles may be a favourable niche for anammox bacteria. The wide distribution of anammox bacteria in the DO‐rich sea waters suggests two possible survival strategies: one strategy is attaching to particles and using anaerobic anammox metabolism to produce energy, and the other strategy is free‐living and using aerobic metabolism to produce energy. Main conclusions A high diversity of anammox bacteria was found in the aerobic water columns, and Ca. Brocadia was the clearly dominant genus. Furthermore, anammox microbes could improve their viability by switching their metabolic pathways between anaerobic and aerobic conditions. Overall, our study has improved the understanding of the distribution and survival strategies of anammox communities in an aerobic marine environment and could provide new ideas for engineering applications in wastewater treatment with anammox technology.

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Significant microbial nitrogen loss from denitrification and anammox in the land-sea interface of low permeable sediments

Cited by 37 publications

References 55 publications

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

Removal Capacities and Environmental Constrains of Denitrification and Anammox Processes in Eutrophic Riverine Sediments

Wide distribution of anaerobic ammonium‐oxidizing bacteria in the water column of the South China Sea: Implications for their survival strategies

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