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    Confirmation of co-denitrification in grazed grassland

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    Author
    Selbie, Diana R.
    Lanigan, Gary
    Laughlin, Ronald J.
    Di, H.J.
    Moir, James L.
    Cameron, K.C.
    Clough, Timothy J.
    Watson, C. J.
    Grant, Jim
    Somers, Cathal
    Richards, Karl G.
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    Keyword
    co-denitrification
    Di-nitrogen (N2) emissions
    Pasture-based livestock systems
    N2 production pathway
    N budgets
    Nitrogen use efficiency
    Date
    30/11/2015
    
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    URI
    http://hdl.handle.net/11019/919
    Citation
    Selbie D.R., Lanigan G.J., Laughlin R.J., Di H.J., Moir J.L., Cameron K.C., Clough T.J., Watson C.J., Grant J., Sommers C. & Richards K.G. (2015) Confirmation of co-denitrification in grazed grassland, Nature Scientific Reports 5:17361 1-5 | DOI: 10.1038/srep17361
    Abstract
    Pasture-based livestock systems are often associated with losses of reactive forms of nitrogen (N) to the environment. Research has focused on losses to air and water due to the health, economic and environmental impacts of reactive N. Di-nitrogen (N2) emissions are still poorly characterized, both in terms of the processes involved and their magnitude, due to financial and methodological constraints. Relatively few studies have focused on quantifying N2 losses in vivo and fewer still have examined the relative contribution of the different N2 emission processes, particularly in grazed pastures. We used a combination of a high 15N isotopic enrichment of applied N with a high precision of determination of 15N isotopic enrichment by isotope-ratio mass spectrometry to measure N2 emissions in the field. We report that 55.8 g N m−2 (95%, CI 38 to 77 g m−2) was emitted as N2 by the process of co-denitrification in pastoral soils over 123 days following urine deposition (100 g N m−2), compared to only 1.1 g N m−2 (0.4 to 2.8 g m−2) from denitrification. This study provides strong evidence for co-denitrification as a major N2 production pathway, which has significant implications for understanding the N budgets of pastoral ecosystems.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Teagasc Walsh Fellowship Programme
    Grant Number
    RSF 07536
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1038/srep17361
    Scopus Count
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use
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