Stevens, Carly J.; Manning, Pete; Van den Berg, Leon J. L.; De Graaf, Maaike C. C.; Wamelink, G. W. Weiger; Boxman , Andries W.; Bleeker, Albert; Vergeer, Philippine; Arroniz-Crespo, Maria; Limpens, Juul; Lamers, Leon P. M.; Bobbink, Roland and Dorland, Edu
Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats.
Environmental Pollution , 159(3) pp. 665–676.
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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 the NHx:NOy ratio which plants are exposed to differs to that in deposition as inputs are modified by soil transformations, mediated by soil pH. Consequently species of neutral and alkaline habitats are less likely to encounter high NH4+ 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.
||2010 Elsevier Ltd.
||ammonium toxicity; atmospheric nitrogen deposition; NHx:NOy ratio; mitigation; nitrogen cycling; nitrification; plant communities; soil acidification
||Science > Environment, Earth and Ecosystems
||02 Mar 2011 16:57
||24 Oct 2012 04:30
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