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Titel:
Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats
 
Auteur(s):
Stevens, C.J.; Manning, P.; Berg, L.J.L. van den; Graaf, M.C.C. de; Wamelink, G.W.W.; Boxman, A.W.; Bleeker, A.; Vergeer, P.; Arroniz-Crespo, M.; Limpens, J.; Lamers, L.P.M.; Bobbink, R.; Dorland, E.
 
Gepubliceerd door: Publicatie datum:
ECN Biomassa, Kolen en Milieuonderzoek 17-1-2011
 
ECN publicatienummer: Publicatie type:
ECN-W--11-003 Artikel wetenschap tijdschrift
 
Aantal pagina's:
13  

Gepubliceerd in: Environmental Pollution (Elsevier), , 2011, Vol.159, p.665-676.

Samenvatting:
While it is well established that ecosystems display strong responses to elevated nitrogen deposition, the importance of the ratio between the dominant forms of deposited nitrogen (NHx and NOy) in determining ecosystem response is poorly understood. As large changes in the ratio of oxidised and reduced nitrogen inputs are occurring, this oversight requires attention. One reason for this knowledge gap is that plants experience a different NHx:NOy ratio in soil to that seen in atmospheric deposits because atmospheric inputs are modified by soil transformations, mediated by soil pH. Consequently species of neutral and alkaline habitats are less likely to encounter high NH4Ć¾ concentrations than species from acid soils. We suggest that the response of vascular plant species to changing ratios of NHx:NOy deposits will be driven primarily by a combination of soil pH and nitrification rates. Testing this hypothesis requires a combination of experimental and survey work in a range of systems.


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