The structure of denitrifying microbial communities in constructed mangrove wetlands in response to fluctuating salinities

Fu, Guiping; Han, Jingyi; Yu, Tianyu; Huangshen, Linkun; Zhao, Lin

doi:10.1016/j.jenvman.2019.02.029

Cited by 73 publications

(15 citation statements)

References 45 publications

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“…Increased salinity causes the elimination of salt-intolerant species ( 38 ). However, within the appropriate salinity range, the abundance of salt-tolerant microorganisms (e.g., Proteobacteria ) will increase with increasing salinity ( 38 ). Therefore, the general salt tolerance of NFOPSMs existed in subtropical mangrove ecosystems.…”

Section: Resultsmentioning

confidence: 99%

Effects of Spartina alterniflora Invasion on Nitrogen Fixation and Phosphorus Solubilization in a Subtropical Marine Mangrove Ecosystem

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Effects of Spartina alterniflora Invasion on Nitrogen Fixation and Phosphorus Solubilization in a Subtropical Marine Mangrove Ecosystem

et al. 2022

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“…The relative abundance of Dechloromonas was higher in FeB-HSCW, indicating that Fe-modified biochar was more conducive to N transformation and N 2 O reduction. Moreover, Thauera , as a type of aerobic denitrifier, could effectively reduce the accumulation of NO 2 − -N and moderate N 2 O emissions [ 49 ]. Wang and Chu [ 50 ] pointed out that Comamonadaceae was the primary group for solid-phase denitrification.…”

Section: Discussionmentioning

confidence: 99%

Community Composition and Spatial Distribution of N-Removing Microorganisms Optimized by Fe-Modified Biochar in a Constructed Wetland

Jia

Yang

2021

IJERPH

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Microbial nitrogen (N) removal capability can be significantly enhanced in a horizontal subsurface flow constructed wetland (HSCW) amended by Fe-modified biochar (FeB). To further explore the microbiological mechanism of FeB enhancing N removal, nirS- and nirK-denitrifier community diversities, as well as spatial distributions of denitrifiers and anaerobic ammonium oxidation (anammox) bacteria, were investigated in HSCWs (C-HSCW: without biochar and FeB; B-HSCW: amended by biochar; FeB-HSCW: amended by FeB) treating tailwater from a wastewater treatment plant, with C-HSCW without biochar and FeB and B-HSCW amended by biochar as control. The community structures of nirS- and nirK-denitrifiers in FeB-HSCW were significantly optimized for improved N removal compared with the two other HSCWs, although no significant differences in their richness and diversity were detected among the HSCWs. The spatial distributions of the relative abundance of genes involved in denitrification and anammox were more heterogeneous and complex in FeB-HSCW than those in other HSCWs. More and larger high-value patches were observed in FeB-HSCW. These revealed that FeB provides more appropriate habitats for N-removing microorganisms, which can prompt the bacteria to use the habitats more differentially, without competitive exclusion. Overall, the Fe-modified biochar enhancement of the microbial N-removal capability of HSCWs was a result of optimized microbial community structures, higher functional gene abundance, and improved spatial distribution of N-removing microorganisms.

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“…Denitrification has often been observed to decline along salinity gradients (Rysgaard et al, 1999;Craft et al, 2009;Giblin et al, 2010). However, this detrimental effect is limited to ammonium oxidizing bacteria and nitrite oxidizing bacteria: Frontiers in Environmental Science frontiersin.org heterotrophic aerobic denitrifiers can thrive on the nitrate produced by heterotrophic nitrification and may successfully remove most of the N under different salinity conditions (Fu et al, 2019). Isotopic analysis of N in ocean sediment layers covering the past 300 million years has shown that substantial variations in denitrification rates were associated with planetary climatic changes such as Quaternary glacial and interglacial periods.…”

Section: Nitrogen Cyclementioning

confidence: 99%

Impacts of salinization caused by sea level rise on the biological processes of coastal soils - A review

Mazhar

Pellegrini

Contin

et al. 2022

Front. Environ. Sci.

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Soil salinization caused by sea level rise threatens coastal agricultural soils and geochemically important wetlands worldwide. The aim of this review is to outline expected changes in soil biological activity by discussing the combined effects of salt stress and flooding on plants productivity and soil microbial communities, which determine consequences on fluxes of C, N and P. Finally, it outlines the expected repercussions on greenhouse gases emissions. The prediction of outcomes is made difficult by the concomitant and sometimes contrasting actions of flooding and seawater intrusion on partly acclimated and non-acclimated environments. Non-salt acclimated plants suffer from osmotic stress, but also from reduced O2 solubility. Microbial biomass declines with increasing salinity and microbial communities shift in composition. Large concentrations of Cl− inhibit nitrification, but salinity stimulates N2O fluxes. Impacts on C mineralisation rates is variable but enhanced by the larger availability of terminal electron acceptors. The reduction of Fe combined with that of SO42− could enhance P mobility. Salinization affects methanogenesis which is constrained in favour of SO42− reduction. Consequences are largely site specific and difficult to predict because of the complex network of processes occurring simultaneously in different compartments (i.e., soil, microbiome, vegetation). The distinction between short and long term effects is also important. A reliable prediction of outcomes at a planetary scale will only result from more precise inventories and monitoring of areas displaying specific similarities and from the implementation from these well-defined data sets of specifically devised models whose results can be finally combined on a weighted basis.

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The structure of denitrifying microbial communities in constructed mangrove wetlands in response to fluctuating salinities

Cited by 73 publications

References 45 publications

Effects of Spartina alterniflora Invasion on Nitrogen Fixation and Phosphorus Solubilization in a Subtropical Marine Mangrove Ecosystem

Effects of Spartina alterniflora Invasion on Nitrogen Fixation and Phosphorus Solubilization in a Subtropical Marine Mangrove Ecosystem

Community Composition and Spatial Distribution of N-Removing Microorganisms Optimized by Fe-Modified Biochar in a Constructed Wetland

Impacts of salinization caused by sea level rise on the biological processes of coastal soils - A review

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