flux nitrogen sediment

Flux of Nitrogen, Phosphorus, and Suspended …

Hirsch, R.M., 2012, Flux of nitrogen, phosphorus, and suspended sediment from the Susquehanna River Basin to the Chesapeake Bay during Tropical Storm Lee, September 2011, as an indicator of the effects of reservoir sedimentation on water quality: U.S. Geological Survey Scientific Investigations Report 2012–5185, 17 p.

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Nutrient Flux Study

8 · Murderkill River/Wetland ecosystem, with an understanding of nitrogen sinks in the ecosystem as the major study focus. The final data set included: Subtidal measurements of sediment-water exchange in the river during July 2007 Small creek and marsh sediment-water exchange in July 2007

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The Effect of Nitrogen Enrichment on C Cycling ...

3 · Using a nitrogen addition gradient experiment in three Southern California salt marshes, we show that sediment CH 4 flux increased linearly with increasing nitrogen addition (1.23 μg CH 4 m −2 day −1 for each g N m −2 year −1 applied) after 7 months of fertilization.

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Nitrogen fluxes, denitrification and the role of ...

28 · ABSTRACT: The annual cycle of oxygen and nitrogen flux, denitrification and microphytobenthic variables (primary production, biomass, composition and calculated N demand) were studied for 2 shallow-water microtidal sediment sites in NE Kattegat, 1 sandy and 1 silty, by incubating undisturbed sediment in the laboratory in light and darkness.

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Journal of Environmental Quality Abstract

1 · Average diffusive flux from sediment to the overlying water was estimated to be 25 mg NH 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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Flux of Nitrogen, Phosphorus, and Suspended Sediment …

25 · 2 Flux of Nitrogen, Phosphorus, and Suspended Sediment from the Susquehanna River Basin to the Chesapeake Bay, 2011 satellite image from Septem (4 days after the peak streamflow at Conowingo Dam), is shown in figure 1. It was widely recognized that a volume of water and sediment …

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Effects of estuarine sediment hypoxia on nitrogen …

Nitrification is a key part of the estuarine nitrogen cycle, resulting in the conversion of ammonia (NH 3) to nitrite (NO 2 −) or nitrate (NO 3 −), thus providing a link with denitrification and subsequent removal of nitrogen from the sediment. Nitrification requires oxygen and as such occurs under aerobic conditions in the upper sediment ...

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(PDF) Reversal of the net dinitrogen gas flux in coastal ...

Reversal of the net dinitrogen gas flux in coastal marine sediments. Nature, 2007. Stephen Granger. Robinson Fulweiler. Wally Fulweiler. Scott Nixon. B. Buckley. Stephen Granger. Robinson Fulweiler.

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Effects of CO 2 enrichment on benthic primary …

Total sediment O 2 uptake and inorganic nitrogen flux Estuarine sand. The sand’s initial total oxygen uptake, TOU, was similar under conditions of light and darkness and similar in Treatment and ...

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Concentrations, Fluxes, and Yields of Nitrogen, …

18 · Concentrations, Fluxes, and Yields of Nitrogen, Phosphorus, and Suspended Sediment in the Illinois River Basin, 2000 By Paul J. Terrio Scientific Investigations Report 5078

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Coupling of sulfur and iron with nitrogen and phosphorus in ...

Coupling of sulfur and iron with nitrogen and phosphorus in sediments of malodorous river: A review LI Wen-chao 1,2, WANG Wen-hao 1,2, HE Yan 1,2, HUANG Min-sheng 1,2,LI Zhi-hong 1,2, ZHOU Kun 1,2, ZHU Lin-lin 1,2 1. Shanghai Key Lab for Urban 2.

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Features and influencing factors of nitrogen and ...

Nitrogen and phosphorus diffusion at the sediment-water interface is vital to the water quality of lakes. In this paper, N and P diffusive fluxes at the sediment-water interface in Erhai Lake were studied using the sediment-pore water diffusive flux method. Characteristics of temporal and spatial variation of N and P diffusive fluxes were analyzed.

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Sediment-water column oxygen and nutrient fluxes in ...

12 · Sediment-water column oxygen and nutrient fluxes in nearshore environments of the lower Delmarva Peninsula, USA William G. Reay1, ... ments could supply 11 % of the phosphorus and 6% of the phytoplankton nitrogen requirements based ... In situ sediment solute flux measurements. Sedi-

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Vertical dissolved inorganic nitrogen fluxes in marsh and ...

16 · In situ dissolved inorganic nitrogen (DIN)fluxes across the sediment–water interface were determinedmonthly at Chongming Island at two sites (a vegetated marsh andan unvegetated mudflat) and were compared with rates from apreviously published laboratory

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Fluxes of nitrogen and phosphorus releasing from sediment ...

Nitrogen and phosphorus are essential factors affecting algae growth.The sources of nitrogen and phosphorus can be divided into external and internal ones.Nitrogen and phosphorus releasing from sediment is regarded as a major component of the internal source.In ...

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Sediment Nutrient Fluxes in the Tidal Chesapeake Bay

14 · Sediment Nutrient Fluxes in the Tidal Chesapeake Bay Jeremy Testa 1, Walter Boynton Jeff Cornwell 2and W. Michael Kemp University of Maryland Center for Environmental Science 1Chesapeake Biological Laboratory 2Horn Point Laboratory

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Flux of Nitrogen, Phosphorus, and Suspended Sediment …

30 · 2 Flux of Nitrogen, Phosphorus, and Suspended Sediment from the Susquehanna River Basin to the Chesapeake Bay, 2011 satellite image from Septem (4 days after the peak streamflow at Conowingo Dam), is shown in figure 1. It was widely recognized that a volume of water and sediment …

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Sediment flux modeling: Simulating nitrogen, …

A model of sediment nitrogen, phosphorus, and silica biogeochemistry is presented. • The model simulates diagentic processes, transformations, and sediment-water fluxes. • Model rates compare favorably with a multi-decade suite of observations. • Calibration routines reveal spatial variation in processes controlling N, P, and Si.

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Flux of nitrogen, phosphorus, and suspended …

Concentrations of nitrogen, phosphorus, and suspended sediment are measured at the U.S. Geological Survey streamgage at Conowingo Dam at the downstream end of the Susquehanna River Basin in Maryland, where the river flows into the Chesapeake Bay. During the period September 15, 2011, in the aftermath of Tropical Storm Lee, concentrations of these three constituents were among the highest ...

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Diffusive nutrient flux at the sediment—water interface in ...

17 · This article contributes to improve understanding of the influence of the sediment on the nutrient cycling and related cyanobacterial outbreaks in Suma Park Reservoir. An initial assessment of the diffusive flux rate of phosphorous (P) and nitrogen (N) at the sediment–water interface was determined using sediment peepers.

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Vertical Dissolved Inorganic Nitrogen Fluxes in Marsh and ...

16 · Nitrogen (N) is a dominant macronutrient in many river-dominated coastal systems, and excess concentrations can drive eutrophication, ... that flux from the sediment to the water column was considered positive, and negative values represented a sink to the sediment.

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Sediment flux modeling: Simulating nitrogen, …

Read "Sediment flux modeling: Simulating nitrogen, phosphorus, and silica cycles, Estuarine Coastal and Shelf Science" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Sediment-Water Nitrogen Fluxes in a Backwater System …

14 · Sediment-Water System of the Upper Nitrogen Fluxes in a Backwater Mississippi River. by William F. James, William B. Richardson, and David M. Soballe ... ment for improved understanding of the importance of N flux at the sediment-water interface in N cycling and retention in backwaters. The objectives of this study were to expand earlier . 1 .

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Frontiers | The Effect of Nitrogen Enrichment on C1 ...

19 · Methane (CH4) flux from ecosystems is driven by C cycling microorganisms – the methanogens and the methylotrophs. Little is understood about what regulates these communities, complicating predictions about how global change drivers such as nitrogen enrichment will affect methane cycling. Using a nitrogen addition gradient experiment in three Southern California salt marshes, we …

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...

The diffusion flux of ammonia nitrogen is significantly correlated with the FN in the sediment (P<0.05). External inputs including livestock and poultry pollutant, aquaculture and domestic sewage discharge, are the main culprits for the nitrogen increase in both

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Influence of a Glacier Melting Cycle on the Seasonal ...

31 · suspended sediment (TSS). According to Zaja¸czkowski and Włodarska-Kowalczuk (2007), three zones can be clearly identified along a glacial fjord: proximal, prodelta, and dis-tal zones. In the proximal zone, sediment flux is mostly driven by highly seasonal terrigenous material supply and dominated by the plume energy, while turbid plumes and

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Effect of algal bloom deposition on sediment …

NH 4 + and NO 3 − flux changed direction, becoming an efflux and influx, respectively, for a few days and a large amount of DON (max. rate 4.0 mmol m d ) was immediately produced either by bacterial hydrolytic activity or from autolysis of the algae. DON was the most significant nitrogen component in pore water and in terms of N-flux from ...

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Flux of Nitrogen, Phosphorous, and Suspended …

27 · Flux of Nitrogen, Phosphorous, and Suspended Sediment from the Susquehanna River Basin to the Chesapeake Bay During Tropical Storm Lee, September 2011, as in Indicator of the Effects of Reservoir Sedimentation on Water Quality

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Journal of Environmental Quality Abstract

9 · Journal of Environmental Quality Abstract - Wetlands and Aquatic Processes Nitrogen and Phosphorus Flux Rates from Sediment in the Lower St. Johns River Estuary

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Reversal of the net dinitrogen gas flux in coastal …

12 · The flux of nitrogen from land and atmosphere to estuaries and the coastal ocean has increased substantially in recent decades. The observed increase in nitrogen …

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