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Friday, August 7, 2020 | History

2 edition of role of denitrification in the nitrogen cycle of New England salt marshes found in the catalog.

role of denitrification in the nitrogen cycle of New England salt marshes

Michael Robert Hamersley

role of denitrification in the nitrogen cycle of New England salt marshes

by Michael Robert Hamersley

  • 278 Want to read
  • 10 Currently reading

Published by Massachusetts Institute of Technology, Woods Hole Oceanographic Institution in Cambridge, Mass, Woods Hole, Mass .
Written in English

    Subjects:
  • Denitrification.,
  • Nitrogen cycle.,
  • Marine sediments -- Nitrogen content -- New England -- Measurement.,
  • Salt marsh ecology -- New England.

  • Edition Notes

    Statementby Michael Robert Hamersley.
    SeriesMIT/WHOI -- 2002-04., MIT/WHOI (Series) -- 2002-04.
    ContributionsJoint Program in Oceanography/Applied Ocean Science and Engineering., Massachusetts Institute of Technology., Woods Hole Oceanographic Institution.
    The Physical Object
    Pagination165 p. :
    Number of Pages165
    ID Numbers
    Open LibraryOL17719237M

    Salt marsh denitrification provides a significant nitrogen sink in Barnegat Bay, New Jersey. In: Buchanan, G.A.; Belton, T.J., and Paudel, B. (eds.), A Comprehensive Assessment of Barnegat Bay-Little Egg Harbor, New ification in salt marshes can be an important removal mechanism for inorganic nitrogen, particularly in coastal.   In salt marshes, the effects of grazing on plant communities (Bakker, , Andresen et al., , Bouchard et al., , Kleyer et al., ), nitrogen mineralization (Wilson and Jefferies, , Van Wijnen et al., , Kiehl et al., ) and microbial activity (Buckridge and Jefferies, ) have been investigated, but we still have limited.

    John M. Logan, Salt Marsh Aboveground Production in New England Estuaries in Relation to Nitrogen Loading and Environmental Factors, Wetlands, /sz, (). Crossref. Responses of nitrogen cycling to nutrient enrichment in New England salt marshes over an annual cycle. Leanna Ruth Heffner, University of Rhode Island. Abstract. To examine the impact of changes in nitrogen regime on salt marsh nitrogen cycling, we measured denitrification and N fixation in two marshes with varying degrees of long-term N enrichment from tidal waters.

      Denitrification has been extensively studied in coastal marine sediments, including salt marshes, but DNRA has received less attention as a NO 3 − reduction pathway. This study determined rates of nitrification, denitrification, and DNRA simultaneously and examined the effect of long‐term fertilization on salt marsh sediment N cycling. Marsh plants were also found to play a significant role in enhancing nitrogen-removal services in young restored marshes. In field experiments, marsh plants were found to increase the temporal and spatial variability of sediment oxygen concentrations and to increase denitrification rates by as much as 5-fold in young restored marshes.


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Role of denitrification in the nitrogen cycle of New England salt marshes by Michael Robert Hamersley Download PDF EPUB FB2

The role of denitrification in the nitrogen cycle of New England salt marshes. View/ Open. (Mb) fluxes and a 15N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling.

Michael R., "The role of denitrification in the nitrogen cycle of New England salt marshes. The role of denitrification in the nitrogen cycle of New England salt marshes. Author(s) Hamersley, Michael Robert Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin.

I studied creekbottom denitrification by direct measurements of N₂ fluxes in closed chambers against a low-N₂. The role of denitrification in the nitrogen cycle of New England salt marshes Article (PDF Available) February with 41 Reads How we measure 'reads'. The role of denitrification in the nitrogen cycle of New England salt marshes.

Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied creekbottom denitrification by direct measurements of N₂ fluxes in closed chambers against a low-N₂ background. Marine sediments Author: Michael Robert Hamersley. Denitrification Enzyme Activity of Fringe Salt Marshes in New England (USA) Article (PDF Available) in Journal of Environmental Quality 33(3) May with Reads How we measure 'reads'.

Denitrification rates ranged between 12 and μmol m −2 h −1 in marshes of the NE United States (Valiela et al., ), whereas gross denitrification rates in vegetated marshes (variable vegetation) ranged between 36 and μmol m −2 d −1, with a median value of μmol m −2 d −1 (n = 16) (Hopkinson and Giblin, ).

Nitrogen (N) is most often implicated as the nutrient limiting primary production in the coastal ocean (), and increased anthropogenic loading may jeopardize important coastal marine ecosystems through l salt marshes may intercept or remove land-derived nutrients along the land-to-sea continuum, thereby regulating coastal primary production (phytoplankton, macroalgae, and.

In this study, the role of anammox in nitrogen removal from marsh sediments was surveyed in four vegetation types characteristic of New England marshes and in unvegetated tidal creeks. The sites. Nitrification, the oxidation of ammonia to nitrate, and denitrification, the reduction of oxidized nitrogen to dinitrogen gas, play critical roles in determining the availability of nitrogen in salt marshes.

Nitrogen is arguably one of the most important nutrients regulating the high productivity reported in many salt marshes (Vitousek et al. The bulk of the interception of land-derived nitrogen is likely to be the result of relatively high rates of denitrification characteristic of salt marshes.

Thus, through exports of energy-rich materials, and interception of limiting nutrients, salt marsh parcels interact in quantitatively important ways with adjoining units of landscape. Salt marshes play an important role in removing excess nitrogen through microbial processes such as denitrification and anaerobic ammonia oxidation (anammox), and one of the major factors known to influence the nitrogen purification capacity of salt marshes worldwide is the invasion of alien species.

The role of denitrification in the nitrogen cycle of New England salt marshes  Hamersley, Michael R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, ) I used direct measurements of nitrogen gas (N2) fluxes and a 15N stable isotope tracer to determine the contribution of denitrification to salt marsh.

Anammox bacteria are widespread in the marine environment, but studies of anammox in marshes and other wetlands are still scarce. In this study, the role of anammox in nitrogen removal from marsh sediments was surveyed in four vegetation types characteristic of New England marshes and in unvegetated tidal creeks.

The sites spanned a salinity gradient from 0 to 20 psu. Denitrification, the microbial conversion of nitrate (NO3-) to N2 gas, plays an important role in the saltmarsh N cycle and in regulating the availability of N to primary producers.

N transported in groundwater and surface flows is delivered primarily to the regularly flooded bottoms of salt marsh creeks, which account for ~1/3 of the area of a.

Hamersley MR. The role of denitrification in the nitrogen cycle of New England salt marshes. Ph.D. dissertation, Massachusetts Institute of Technology, Cambridge, MA and the Woods Hole Oceanographic Institution, Woods Hole, MA. Role of salt marshes as part of coastal land-scapes.

Comparative evidence that salt marshes and mangroves may protect seagrass meadows from land-derived nitrogen loads Jan   Salt marshes play a key role in removing excess anthropogenic nitrogen (N) loads to nearshore marine ecosystems through sediment microbial processes such as denitrification.

However, in the Gulf of Mexico, the loss of marsh vegetation because of human-driven disturbances such as sea level rise and oil spills can potentially reduce marsh capacity for N removal.

The key role of microbes in nitrogen fixation. How overuse of nitrogen-containing fertilizers can cause algal blooms. The nitrogen cycle. This is the currently selected item. The nitrogen cycle.

The phosphorus cycle. Phosphorus cycle. Eutrophication and dead zones. Practice: Biogeochemical cycles. Salt marshes in New England, USA, play significant roles in the coastal zone N cycle.

Inorganic N availabil-ity limits salt marsh macrophyte and algal productivity, while high rates of microbial denitrification of NO 3 – to N 2 gas in salt marsh sediments remove N from recy-cling pools (Sullivan & DaiberValiela & TealHowes et al. Despite these factors, denitrification rates values measured in our cold salt marsh sediments are comparable with those obtained by other workers along the North-West Atlantic Coast and in Western Europe temperate salt marshes (e.g.

Great Sippewissett Marsh (New England, USA) 0– μmol N 2 m −2 h −1, Kaplan et al., ; Colne Point. Introduction. Salt marshes rank among the most productive and valuable ecosystems in the world (Deegan et al., ; Bowen et al., ), yet they are sensitive and vulnerable to climate change and direct anthropogenic disturbances (Gedan et al., ).It is recognized that salt marshes have a major role in protecting coastal areas, for instance by removing land-derived compounds (Valiela and.Regarding the role of salt marshes in nitrogen removal, net N.

2. flux was dominated by denitrification, with direct denitrification driving differences between sites in tidal N removal. However, our observed rates of denitrification and N fixation were at the lower .Responses of nitrogen cycling to nutrient enrichment in New England salt marshes over an annual cycle.

By Leanna Ruth Heffner. Abstract. To examine the impact of changes in nitrogen regime on salt marsh nitrogen cycling, we measured denitrification and N fixation in two marshes with varying degrees of long-term N enrichment from tidal waters.