Impact Type: Deposition of pollutant
False brome grass (Brachypodium pinnatum) is an invasive species which is favoured by nitrogen deposition (Wilson et al. 1995a, Hornung et al. 1994). This is a particular problem for calcareous species rich grasslands and heathland communities (Bobbink et al. 1998, Britton et al 2000, UN ECE CLRTAP 1996). B. pinnatum stores N below ground in a well developed rhizome system allowing it to establish itself as an aggressive competitor from early spring. B. pinnatum appears to have a relatively low P-K demand which will also give it a competitive advantage.
Most of the research on this species is from southern England and Holland (e.g. Bobbink et al. 1998, Britton et al. 2000).
|Habitat/ Ecosystem Type||Eunis Code||Critical Load/ Level||Status||Reliability||Indication of exceedance||Reference|
|Alpine and subalpine grasslands||E4.3; E4.4||
5-10 Kg N ha-1 year-1
|UNECE 2010 - Noordwijkerhout workshop||expert judgement||
Changes in species composition; increase in plant production.
|Sub-atlantic semi-dry calcareous grassland||E1.26||
15-25 kg N ha-1 year-1
|UNECE 2010 - Noordwijkerhout workshop||reliable||
Increase in tall grasses, decline in diversity, increased mineralization, N leaching; surface acidification.