flux nitrogen sediment

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Sediment-Water Nitrogen Flux in the Gulf of Mexico Near ...

sediment-water nitrogen fluxes measured in benthic bottom lander chambers at similar stations to estimate the potential importance of macroinvertebrate excretion to sediment nitrogen mineralization. Excretion rates for individual crustaceans (am phi pods and decapods) was 2-21 nmoles NH4 + (mg dry weight) -• h -•. The mean excretion

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Salish Sea Model: Sediment Diagenesis Module

updated Salish Sea Model, including simulation of sediment diagenesis and fluxes of oxygen and nitrogen between the water and sediment, was re-calibrated to the observed data. The model skill with the new Sediment Diagenesis Module was comparable to the previous version of the

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Distributions and Fluxes of Nitrogen and Phosphorus ...

Furthermore, the flux value (F) was calculated based on the Fick's I Law which was corrected by porosity. The results show that the mean concentrations of nitrate (NO3-), nitrite (NO2-) and phosphate (PO42-) in the sediment water of Serang Estuary are 1.96, 1.41, 3.46 μM and in the Wiso estuary are 3.4, 1.85, 8.22 μM.

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Distributions and Fluxes of Nitrogen and Phosphorus ...

the sediment water of Serang Estuary are 1.96, 1.41, 3.46 μM and in the Wiso estuary are 3.4, 1.85, 8.22 μM. In general, based on the calculation of flux, the sediments in the Serang and Wiso estuaries have a positive flux. Moreover, the sediment in Jepara acts as a source and releases N and P nutrient into the water column. The Wiso

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Relationships Among Nutrient and Sediment Fluxes ...

Decreasing fluxes with increasing cumulative storm discharge was observed and is consistent with the reduction of flux by individual storms through the rainy season. Nutrient fluxes, particularly nitrate, were higher in agricultural sites. Ammonium fluxes were highest, and phosphate and suspended sediment fluxes were elevated after wildfires.

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Resuspension and Diffusive Flux of Nitrogen and Phosphorus ...

Average diffusive flux from sediment to the overlying water was estimated to be 25 mg NH 4-N m −2 d −1 and 1 mg P m −1 d −2. Resuspension fluxes of NH + 4 and SRP were higher than diffusive flux. Soluble reactive P profiles of porewater showed distinct profile differentiation, with the surface 0 to 8 cm sediment depth acting as a P ...

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Quantifying the Effect of Aquaculture on Nutrient Flux at ...

Sediment biogeochemical processes lead to the mineralization of biodeposits high in carbon and nitrogen content, and increase the flux of inorganic nutrients to the water column. The effect of aquaculture operations on water quality regarding sediment nutrients (carbon, nitrogen, phosphorus) and flux within the three bioregions, with an ...

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Frontiers | Connecting the dots: linking nitrogen cycle ...

Connecting the dots: linking nitrogen cycle gene expression to nitrogen fluxes in marine sediment mesocosms Jennifer L. Bowen 1 *, Andrew R. Babbin 2, Patrick J. Kearns 1 and Bess B. Ward 2 1 Department of Biology, University of Massachusetts Boston, Boston, MA, USA

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Human-caused increases in reactive nitrogen burial in ...

These results suggest that the dominant processes of phosphorus burial in lakes are different from those for carbon and nitrogen (Figure 1), including biological, physical, and geological processes.1, 27 Phosphorus fluxes to the sediment (burial) and back (release) to the water heavily depends on oxygen concentrations; thus, a net burial ...

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Nitrogen distribution and diffusive fluxes in sediment ...

12%The average diffusive fluxes of total nitrogen and nitrate nitrogen at the sediment–water interface were 0.87 and 0.86 mg/m 2 day, respectively. Introduction With the intensification of human activity and the rapid development of economy, lake eutrophication has become a significant problem in recent decades.

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Human-caused increases in reactive nitrogen burial in ...

These results suggest that the dominant processes of phosphorus burial in lakes are different from those for carbon and nitrogen, including biological, physical, and geological processes. 1, 27 Phosphorus fluxes to the sediment (burial) and back (release) to the water heavily depends on oxygen concentrations; thus, a net burial appears with ...

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Sediment pollution and nitrogen release at the sediment ...

Two methods of sediment pollution assessment were applied and the results showed that the sediment at site H9 was the most contaminated and that at site H4 and H7 was almost unpolluted. pH was significantly and positively correlated with total nitrogen (TN) content and flux (P < 0.05), indicating that N fluxes could be related to environmental ...

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Concentrations, fluxes, and yields of nitrogen, phosphorus ...

Concentrations, spatial and temporal variations, and fluxes of nitrogen, phosphorus, and suspended sediment were determined for 16 streams in the Illinois River Basin, Illinois from October 1996 through September 2000. Water samples were collected through the National Water-Quality Assessment's Lower Illinois River Basin (LIRB) and Upper Illinois River Basin (UIRB) Study Units on a monthly to ...

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Fluxes of N2O at the sediment‐water and water‐atmosphere ...

Fluxes of N 2 O across the sediment-water and water-air interfaces were measured using a mass-balance approach in which gas exchange coefficients were measured in situ. The observed atmospheric flux averaged 0.25 mg N 2 O m −2 h −1, and was among the highest reported fluxes for aquatic systems on a per-area basis, although the significance ...

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(PDF) Effect of Nitrification on Nitrogen Flux Across ...

Most studies related to nitrogen flux across the sediment-water interface were focused on the effects of aquatic environment factors on nitrification rates, while there is no information about the ...

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Effects of CO 2 enrichment on benthic primary production ...

Total sediment O 2 uptake and inorganic nitrogen flux Estuarine sand. The sand's initial total oxygen uptake, TOU, was similar under conditions …

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Nitrogen and Phosphorus Flux Rates from Sediment in the ...

Nitrogen and Phosphorus Flux Rates from Sediment in the Lower St. Johns River Estuary Lynette M. Malecki, Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida, 106 Newell Hall, P.O. Box 110510, Gainesville, FL, 32611

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The Effects of Sea Salts on the Forms of Nitrogen Released ...

SEDIMENT SAMPLES Lake Michigan is a temperate, mesotrophic Lau rentian Great Lake in the northern United States where denitrification and sediment-water nitrogen fluxes have previously been measured at two sta tions (Gardner et al. 1987). Two cores of silty …

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(PDF) Flux of nitrogen and sediment in a fringe mangrove ...

In this study we used the flume technique to estimate fluxes of organic and inorganic nitrogen and total suspended sediments in a fringe mangrove forest in Terminos Lagoon, Mexico. We assessed (1) the role of the mangrove forest as a sink or source of nitrogen, (2) the seasonality of nitrogen fluxes, and (3) the total sediment exchange.

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Effect of Nitrification on Nitrogen Flux Across Sediment ...

The release flux of TON accounted for more than 50% of the total nitrogen. The nitrification process stimulated the growth of ammonifying bacteria and accelerated the release of NH 4 + and NO x − from the sediment cores during the 40-day …

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Flux of nitrogen and sediment in a fringe mangrove forest ...

Fluxes of dissolved inorganic and organic nitrogen, particulate nitrogen, and total suspended sediments were measured in a fringe mangrove forest using the flume technique during a 15-month period in Terminos Lagoon, Mexico. The 12-m flume extended through a fringe forest from a tidal creek to a basin forest.

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Flux of nitrogen and sediment in a fringe mangrove forest ...

Fluxes of dissolved inorganic and organic nitrogen, particulate nitrogen, and total suspended sediments were measured in a fringe mangrove forest using the flume technique during a 15-month period in Terminos Lagoon, Mexico. The 12-m flume extended through a fringe forest from a tidal creek to a basin forest. There was a net import of dissolved inorganic nitrogen (NH ⁺₄

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(PDF) Effect of Nitrification on Nitrogen Flux Across ...

The effects of the nitrification process on the fluxes of ammonium (NH4+), nitrite (NO2-) + nitrate (NO3-), and total organic nitrogen (TON) across the sediment-water interface have been examined.

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Effect of Nitrification on Nitrogen Flux Across Sediment ...

conducted to investigate nitrogen flux from the sediment cores collected from the Three-Gorge Reservoir of the Yangtze River (China). The effects of the nitrification process on the fluxes of ammonium (NH4+), nitrite (NO2~) + nitrate (NO3~), and total organic nitrogen (TON) across the sediment-water interface have been examined. The release ...

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Nitrogen, Phosphorus, and Suspended Sediment fluxes from ...

Robert M. Hirsch, Research Hydrologist, USGS August 13, 2012 Nitrogen, Phosphorus, and Suspended Sediment fluxes from the Susquehanna River to the Bay in Tropical Storm Lee,

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Land-use effects on fluxes of suspended sediment, nitrogen ...

SummaryA 6-year study was conducted in the Johnstone River system in the wet tropics of north-eastern Australia, to address concerns that the Great Barrier Reef is at risk from elevated levels of suspended sediment (SS) and nutrients discharged from its river catchments. Aims were to quantify: (i) fluxes of SS, phosphorus (P) and nitrogen (N) exported annually from the catchment and (ii) the ...

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Comprehensive analysis of nitrogen distributions and ...

Positive NH 4+ -N fluxes were found for 28 of the 34 sediment core samples, so the potential for NH 4+ -N being released from sediment was relatively high. The NH 4+ -N fluxes were 5.35-48.76 mg/m 2 /day, and the mean and maximum fluxes were 8.71 and 48.76 mg/m 2 /day, respectively.

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Flux of nitrogen, phosphorus, and suspended sediment from ...

Trends in flow-normalized fluxes at the Susquehanna River at Conowingo, Maryland, streamgage during 1996-2011 indicate a 3.2-percent decrease in total nitrogen, but a 55-percent increase in total phosphorus and a 97-percent increase in suspended sediment. These large increases in the flux of phosphorus and sediment from the...

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Megafire affects stream sediment flux and dissolved ...

The megafire caused a ~2,000-fold increase in sediment flux and a ~6,000-fold increase in particulate carbon and nitrogen flux over the course of the storm. Unexpectedly, dissolved organic carbon (DOC) concentration was 2.1-fold higher in burned watersheds, despite the decreased organic matter from the fire.

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Calculation of Inorganic Nitrogen Fluxes in the Yangtze ...

Abstract: Based on the data of inorganic nitrogen fluxes at the sediment-water interface of eleven typical sectional sites in tidal wetland of the Yangtze estuary from 2002 to 2004, we established the inorganic nitrogen fluxes interpolation model and calculating model. Using these models, we studied the spatio-temporal distributing ...

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