Effect on marine sediment nitrogen fluxes caused by organic matter enrichment with varying organic carbon structure and nitrogen content

Dahllöf, Ingela; Karle, Ida-Maja

doi:10.1016/j.marchem.2004.07.008

Cited by 14 publications

(14 citation statements)

References 21 publications

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“…Our model results showed that sediment chlorophyll-a content is the factor that was most strongly related to TOU, ammonia and silicate fluxes (Figures 8B,F,J) confirming a rapid response of sediment benthic faunal and bacterial activities after fresh phytodetritus deposition (e.g., Banta et al, 1995;Conley and Johnstone, 1995;Grenz et al, 2000;Dahllöf and Karle, 2005;Beck et al, 2008). These fluxes were also significantly higher and more variable during summer 2008 when the highest sediment Chl-a content were also measured ( Figure 4E; Figures 6A,B,F).…”

Section: Chlorophyll-asupporting

confidence: 56%

Statistical Modeling of Variability in Sediment-Water Nutrient and Oxygen Fluxes

2016

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Mineralisation of organic detritus in the marine surficial sediments generates a flux of dissolved inorganic nutrient between the sediment and overlying water column. This is a key process in the marine ecosystem, which links the food webs of the sea-floor and the overlying water-column, and is potentially affected by a range of interacting environmental and sedimentary factors. Here, we use General Additive Models (GAM) to statistically disentangle some of the factors controlling the seasonal and spatial variability in nutrients and oxygen fluxes in a field dataset collected in the North Sea off the northeast coast of Scotland. We show that sediment grain size, turbidity due to sediment re-suspension, temperature, and sediment chlorophyll content were the key factors affecting oxygen, ammonia, and silicate fluxes. However, phosphate fluxes were only related to suspended sediment concentrations, whilst nitrate fluxes showed no clear relationship to any of the expected drivers of change, probably due to the effects of denitrification. Our analyses show that the stoichiometry of nutrient regeneration in the ecosystem is not necessarily constant and may be affected by combinations of processes.

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Section: Chlorophyll-asupporting

confidence: 56%

Statistical Modeling of Variability in Sediment-Water Nutrient and Oxygen Fluxes

2016

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“…Therefore, the enhanced ammonium efflux resulting from Additions A to D can to a large extent be explained by the sudden introduction of either too much organic matter containing both ammonium and nitrate from potential intracellular storage in Ulva lactuca (Rosenberg & Ramus 1982, Lundberg et al 1989, or organic matter with a too high C:N ratio to readily be incorporated in the microbial biomass. These results are in line with previous results from simplified smallscale experiments with additions of organic matter to sieved sediment from the same site (Dahllöf & Karle 2005). The results from the latter study suggested that an addition of organic matter with a low C:N ratio will have a larger impact on sustaining eutrophication via increased ammonium effluxes, than organic matter with high C:N ratio when the same amount of carbon is added.…”

Section: Discussionsupporting

confidence: 91%

Biogeochemical response of an intact coastal sediment to organic matter input: a multivariate approach

Karle¹,

Hall²,

Dahllöf³

2007

Mar. Ecol. Prog. Ser.

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We tested the effect of additions of organic matter of different quality (C:N ratio) and quantity on benthic fluxes of ammonium, nitrate, silicate, oxygen and dissolved inorganic carbon (DIC). Additions were made to intact sediment boxes, according to a 2-level factorial design, and the magnitude and temporal scale of the response were evaluated with Partial Least Square (PLS) regression analysis. Response patterns were followed over a 40 d period following the addition, but only fluxes of ammonium, nitrate, silicate and oxygen for the first 2 d after addition, and nitrate fluxes for the first 8 d after addition, could be used for predictive modelling. The results showed that the response of the microbial community to different qualities and quantities of organic matter may initially be related to its capacity to sequester organic matter, and in the long term, to its growth in response to the respective nutritional supply. The results also suggest that such an experimental approach can be a useful tool for classification of areas with potential risk of eutrophication.

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“…Whereas denitrifiers responded almost instantaneously to phytoplankton addition, sludge biomass addition significantly enhanced N 2 effluxes only after 1.2 d (Figure 1), possibly reflecting a 295 slower response of the microbial community to the less labile (higher C:N) material (10).…”

Section: Short-term Stimulation Of Denitrificationmentioning

confidence: 99%

Short-Term Enhancement and Long-Term Suppression of Denitrification in Estuarine Sediments Receiving Primary- and Secondary-Treated Paper and Pulp Mill Discharge

Oakes

Eyre

Ross³

2011

Environ. Sci. Technol.

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To determine the role of sediment denitrification in removing inputs of primary- (PE) and secondary-treated effluent (SE) from a pulp and paper mill (PPM), organic matter (OM) associated with PE (residual wood fiber) and SE (activated sludge biomass and phytoplankton) was added to estuarine intertidal sediments and denitrification rates were measured over 27 days. Labile sludge biomass and phytoplankton initially stimulated denitrification, including for pre-existing sediment N. After 2.5 d, however, denitrification was suppressed apparently due to microbial competition for N to process the refractory (high C:N) material remaining. Wood fiber suppressed denitrification throughout the experiment due to competition for N to process the refractory OM. Ultimate long-term denitrification suppression by phytoplankton is offset by initial enhanced denitrification rates. Although nutrient release during degradation of sludge biomass and wood fiber may stimulate phytoplankton production, N equivalent to 127% of the expected daily phytoplankton load was denitrified within 24 h, allowing for permanent removal of PPM-derived N. Compared to primary treatment, secondary treatment of PPM effluent has greater potential for N removal.

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Effect on marine sediment nitrogen fluxes caused by organic matter enrichment with varying organic carbon structure and nitrogen content

Cited by 14 publications

References 21 publications

Statistical Modeling of Variability in Sediment-Water Nutrient and Oxygen Fluxes

Statistical Modeling of Variability in Sediment-Water Nutrient and Oxygen Fluxes

Biogeochemical response of an intact coastal sediment to organic matter input: a multivariate approach

Short-Term Enhancement and Long-Term Suppression of Denitrification in Estuarine Sediments Receiving Primary- and Secondary-Treated Paper and Pulp Mill Discharge

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