[Ammonia is one of the key pollutants that contribute to nitrogen deposition. Please read the Nitrogen deposition - Fen, Marsh and Swamp record to understand the full impacts effects of nitrogen deposition including ammonia.]
Sphagnum species will be vulnerable to N both through direct N induced toxicity and indirectly from shading by increased vascular plants growth. The extent to which shading occurs will reflect the capacity of the vascular plants to use the addition N to increase C assimilation. Molinia caerulea , despite having a relatively low Ellenberg N score appears to be a nitrophile in the presence of high NH4+ concentrations (van den Berg pers comm.).
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